Circuit Electronics

electronic circuit link

2010-06-07T21:08:00.000-07:00

Digital logic circuit

2010-05-31T23:35:00.000-07:00

This is digital logic circuit. Which use digital IC kind CMOS and TTL many the number.
It be the character gate very the circuit has appropriately. It is the measuring instrument logic
show electricity position low or high get. May show with LED or utter hear all right.
The gate IC come to use produce sound frequency or the other circuit

more

Duracell Portable Inverter – 3000 Watts

2010-05-27T07:29:00.000-07:00

The best contemporary technology combined with traditional Marantz quality. That’s what the Marantz AV8003 is all about. It’s more than just an outstanding A/V processor. click to see/view price of Duracell Portable Inverter – 3000 Watts

Circuit Alarm

2010-05-19T21:32:00.000-07:00

This be simple circuit alarm diagram for extremely the electronics everyone.
Try build keep be usable example , alarm system of the usability
be home security alarm circuit, car alarm circuit, fire alarm circuit,
burglar alarm circuit etc. By compose many circuits as follows �

Proximity Detector Using CS209
Rain Alarm using NE555
Low Cost Fire Alarm Circuit Using Transistor
Fire Alarm Using Thermistor
Chamberlain Wireless Alert System
Water Softener Circuit using NE555
8-Zone Water Sensor Alert Kit
Water Sensor Alarm
Wireless Portable Video Security System LCD - Outdoor Camera
Skylink WT-433 Window-Door Sensor
Personal Alarm using IC 74HC04
Lamp flashing alarm automatic
Car Alarm Simulator
Car Burglar Alarm system with radio wave signal
Car Burglar Alarm timer delay using NE556
Simple Metronome using transistor
Warbling Alarm Circuit with tone Generator
Wireless Home Security System Calls Your Cell Phone
Home and Vehicle 2-Zone Alarm Pager System
Emergency power siren 6 watt
Water Sensor Alarm Kit
Car Alarm Simulator by LM324
Water Sensor Alarm using LM380
Two Tone Alarm generator using LM3900
Electronic Watch Dog Kit
Mini Emergency Light by 9013 transistor
Headlight Alarm
Powerful Siren by BC337
One-IC two-tones Siren with IC 4093
Electronic Siren by IC Digital
Single Zone Digital CMOS Alarm
Miniature Loop Alarm
Red Alert Startrek Alarm by IC 555
American Police Car Siren by IC 555
British Police Car Siren by IC 555
Two HiJack Alarms by 4001
Water Alarm with LM380
Two Tone Alarm with IC LM3900
Mosfet 6 Watt Siren
Travel Touch Alarm
Assortment of Siren Circuits

schmitt trigger comparator

2010-05-13T10:17:00.000-07:00

LM555 Timer Used As A Voltage Comparator Or Schmitt Trigger

The next section shows how the LM555 timer could be used as a voltage comparator or a wide offset Scmitt Trigger. Applications for which it ...

Touch Motor Control by SCR and Schmitt Trigger

This circuit designs for control DC Motor 12Volt. By use the touch once Motor as a result turn go to once. When use a finger touches the ...

cmos crystal oscillator circuit

2010-05-13T10:05:00.000-07:00

Crystal Oscillator with IC Digital 74HC04

The circuit above is a parallel resonant oscillator circuit. ... 32.768 KHz oscillator using a watch crystal · Cmos Logic Clock Oscillator ...

X'tal Oscillator Frequency by 74LS04

This circuit may used as clock frequency for many digital circuits. ... 32.768 KHz oscillator using a watch crystal · Cmos Logic Clock Oscillator by Ic 4011 ...

CMOS Crystal Frequency Multiplier

A disadvantage is that such a circuit would quickly become quite ... 32.768 KHz oscillator using a watch crystal · Cmos Logic Clock ...

FM Stereo Transmitter with IC BA1404

2010-05-07T07:14:00.000-07:00

ntegrated FM radio transmitter that I like better for ซ Pure Born BA1404 IC is a single signal in stereo to FM radio quality as the mineral quartz frequency with Bristol. Not a signal stir Suitable for the study of radio transmitters. Improve the balance. Send to a higher power. Frequency is 88MHZ - 108MHz frequency area covered. 3V low power and culture is running. You may also be adapted to any set of signals for iphone Link

Simple Digital Counter by 4026

2010-05-07T07:13:00.000-07:00

Range from simple digital ICs No. 4026 as driver tubes and a range of LED 7 counted. Has great convenience.
For experiments to learn more digital electronic circuit according to Link.

One shot circuit

2010-05-05T22:41:00.000-07:00

The one short circuit, be the circuit delays one kind. It work with something trigger of logic digital signal.
It cause way change output follow while note. Which there are various circuit examples for consider,
choose use cough abundantly that is appropriate.

555 timer Mono stable (one shot) circuit
19 Apr 2007 ... The two circuits below illustrate using the 555 timer to close a relay
for a predetermined amount of time by pressing a momentary N/O push ...

One - Shot Timer by IC 555
This is digital circuit, It is One - Shot Timer make by IC 555. Power supply 5-15V,
Output pin 3, Input pin 2 Trigger input. One - Shot Timer by IC 555.

One-Shot By IC Quad Timer 558
23 Jul 2007 ... One-Shot By IC Quad Timer LM558 When mention the circuit
One Shot friends at take an interest digital side may know good that how much is it ...

Simple Touch Switch One Shot by 4011
17 Apr 2008 ... Here is a simple touch control switch, I use IC 4011. Logic HI
at output is timer pulse delay control by C1 1S = C1 4.7uF(micro farad), ...

Monostable Flip Flop
19 Apr 2007 ... The circuit then remains in a stable state until the next input.
The one shot circuit on the right employs two logic inverters which are ...

One-Shot by IC 74LS02
15 Aug 2007 ... This is circuit Digital One-Shot, use IC TTL Digital 74LS02 :
QUAD 2-INPUT NOR GATE . Time Output = 0.8xRxC Related Links More digital ...

Monostable Multivibrator by 4538
26 Mar 2008 ... When you trigger the chip the output sends off one single pulse or one ...
More circuit about one shot · One-Shot By IC Quad Timer 558 ...

Switch circuit

2010-04-15T21:14:00.000-07:00

Automatic Lamp Control with Light Sensitive Switch
7 Feb 2008 ... The circuit above is an automatic switch which functions in absence of light.
The IC 4060 works as an oscillator and the generated signal is ...

Light Sensitive Switch with LDR + 2N2926
18 May 2007 ... Click to View Circuit Light Sensitive Switch with LDR + 2N2926
This be circuit warn when be become dark, or Light sensitive switch.

Sound SCR Switch by IC 1458 & SCR C106D
This is Sound SCR Switch Using IC 1458 & SCR C106D, It is Electronic control circuit.

Frost Alarm or Cold Activated Switch by IC 741
A simple thermistor triggered cold switch with adjustable threshold. Notes:
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees ...

One Button On Off Switch by 4093 and IRFZ44
7 Feb 2008 ... The load is driven by the MOSFET IRFZ44 and 4093 AND gates
are used in the circuit. The output of the 4093 IC drives the MOSFET.

Simple Touch Switch One Shot by 4011
17 Apr 2008 ... Here is a simple touch control switch, I use IC 4011. Logic HI
at output is timer pulse delay control by C1 1S = C1 4.7uF(micro farad), ...

Voltage Controlled Switch using 555 Timer
IC 555 Circuit, Voltage Controlled Switch using 555 Timer. ...
In this circuit the 555 timer is used in a novel way, as a voltage controlled switch. ...

Capacitive Sensor(Touch switch relay) with BC337
14 Sep 2007 ... Special design for shop-windows animation Useful for many
types of touch controls Parts: R1,R2_____1M 1/4W Resistors R3,R4____47K 1/4W.

Current-Limit Switch Is Digitally Programmable
17 Dec 2007 ... Current-limit switches are virtually ubiquitous in system controls.
They provide a safe means for regulating the current delivered to a load ...

PBS Switch Debouncing by 555
17 Apr 2008 ... This circuit will remove the transient spikes and contact bounces
from a non-latching push button switch. Using a 555 timer as a monostable ...

100 Seconds Duration On Switch with Touch Control by 555
7 Feb 2008 ... This is a touch control switch which keeps the circuit on about 100 seconds
after touching the plate connected to the 2 numbered pin.

Standard Touch Switch by Gate of IC 4011
27 Apr 2008 ... This circuit uses a 4011 logic gate digital as the bases of the touch switch.
It are Standard and very easy because I used a Gate of IC 4011 ...

Touch Switch By IC 4001 & 4020
18 May 2007 ... Circuit Touch Switch By IC CD4001, CD4020 This be touch switch
be simple again the circuit. It use integrated digital circuit is important ...

High Current MOSFET Toggle Switch with Debounced Push Button
24 Apr 2007 ... This circuit was adapted from the Toggle Switch Debounced Pushbutton
by John Lundgren. It is particularly useful in controlling a load from ...

Autoformer Switch-Mode Power Supply
18 Feb 2008 ... This is a small 2*25 (actually, 2*50) WPC amplifier with 3-order
crossover stage (configurable as LP or HP). Of particular interest is the ...
CMOS 4013 Switch
30 Jul 2008 ... The voltage generated by a piezo transducer can activate a digital circuit.
One may build a simple demonstration switch from a piezo ...

Switch-Mode Power Converters: Design and Analysis
14 Nov 2007 ... This book introduces an innovative, highly analytical approach to symbolic,
closed-form solutions for switched-mode power converter circuits ...

Touch Switch using digital IC
7 Dec 2008 ... If friends seek touch switch Circuit model to be simple.
I begs for to advise this circuit, use integrated digital circuit number IC 4011 ...

Switch-Mode LED Backlight by MAX1698
22 Mar 2008 ... White-LED backlights are gaining acceptance because they
offer higher reliability and simpler drive circuitry than those based on CCFL and ...

12V 10A Dark Activated Switch by LM324
3 Oct 2007 ... The circuit is a combination manual switch and automatic dark-activated switch.
It is designed to control up to 10 amps of 12V lights.

555 timer as a switch-mode power supply
27 Dec 2007 ... Most switch-mode power supplies rely on a PWM
(pulse-width-modulated) output that is controlled via voltage feedback.

Temperature Window switch by IC 741
16 Oct 2007 ... This circuit, is basically a resistance sensing window switch,
except that the resistor takes the form of an NTC thermistor and ...

Bounceless Switch by IC 555
Bounceless Switch by IC 555. ... This is circuit Bounceless Switch , Use IC 555 Timer for Easy
Timer circuit. Output pin 3 pluse 0.1s. Control by push S1. ...

Opto-Thermo Control Relay Switch with IC 741
18 May 2007 ... Circuit Opto-Thermo Control Relay Switch with IC 741
This be Electronic switch circuit is onely. Which work with the light and the ...

Light Relay Switch By BC547 & BC337
This Circuit is easy, Light Relay Switch By BC547 & BC337. Circuit Light Relay Switch
By BC547 & BC337 PCB Light Relay.

Fairchild Power Switch
18 Mar 2008 ... The PWM controller features integrated oscillator to be synchronized
with the external sync signal, under voltage lockout, optimized gate ...

Circuit Lighting : Light Sensitive Switch with LDR + 2N2926
Circuit Lighting , Light Sensitive Switch with LDR + 2N2926.

IC 4049 Bounceless Switch
This is Bounceless Switch using IC 4049 , It is Electronic control circuit.

555 IC Timer control relay Switch
18 May 2007 ... Click to View Circuit 555 IC Timer control relay Switch This the circuit sets
the time to are simple one that interesting , because use IC ...

Ultrasonic circuit

2010-04-15T21:12:00.000-07:00

Ultrasonic Range Meter by PIC16F873
8 Jan 2008 ... This circuit is measuring the range to an object by using ultrasonic
transmitter and ultrasonic receiver. The distance is calculated by PIC ...

Ultrasonic Pest Repellent by CD4013
27 Oct 2008 ... It is well know that pests like rats, mice etc are repelled by ultrasonic
frequency in the range of 30 kHz to 50 kHz.

Ultrasonic Parking Sonar by 4017
6 Feb 2008 ... It works on the sonar principle, sending an ultrasound burst and listening for
first echo. The burst generated by the oscillator built ...

Ultrasonic Parking Sonar by 40106
5 Oct 2007 ... Feautures: * automatic switch on on rear gear * led-bargraph display
* audible bleep on last led * good old design style, no.

Timer circuit

2010-04-13T23:41:00.000-07:00

This is timer circuit, , which compose the circuit controls, delay the work.
When expire warn or use control other get. The majority is will the circuit is simple,
then build not difficult. For example NE555 integrated circuit leads come to are usable,
The circuit delays with the transistor and other again many the circuit.

555 Asymmetric Timer
A simple astable timer made with the 555, the mark (on) and space (off)
values may be set independently. The timing chain consists of resistors Ra, ...

555 Timer 5 to 30 Minute
However you must use the CMOS type 555 timer designated the 7555,
a normal 555 timer will not work here due to the resistor values. ...

Timer Plus Relay by IC 555
Timer Plus Relay by IC 555. ... Use IC 555 Timer (HOT IC) and Relay 6V ,
Volt supply 9V. R1 and C1 control timer relay 11 S. Trigger circuit pin 2 to switch ...

Voltage Controlled Switch using 555 Timer
IC 555 Circuit, Voltage Controlled Switch using 555 Timer. ... In this circuit the 555 timer
is used in a novel way, as a voltage controlled switch. ...

Car Burglar Alarm timer delay using NE556
12 Jan 2009 ... Car Burglar Alarm timer alarm system circuit , model to economize.
This circuit convenients for to set up in an automobile. usually switch ...

One - Shot Timer by IC 555
This is digital circuit, It is One - Shot Timer make by IC 555. Power supply 5-15V, Output pin 3,
Input pin 2 Trigger input. One - Shot Timer by IC 555.

Astable Timer with PIC 12F629 - 12F675
5 Jun 2009 ... This software functions as a long period astable mutivibrator.
The mark and space period can be set from 1 second up to a maximum 65535 ...

PIC16F628 Digital Clock Timer
1 Feb 2008 ... This clock timer uses a PIC16F628 microcontroller to display 3 and 1/2 digit
time and control an external load. It can be programmed to time ...

Basic Timer By IC Quad Timer LM558
23 Jul 2007 ... Basic Timer By IC Quad Timer 558 Today I begs for to advise
the circuit timer the foundation. By use the integrated circuit number LM558 (IC ...

RS - Flip-Flop Made With A LM556 Timer
5 Sep 2009 ... The circuit on this page is for a hybrid - SET / RESET type of
logic Flip-Flop that is constructed from an LM556 - Dual Timer integrated ...

Power Saver & Timer Kit
12 Sep 2009 ... This little timer kit can be easily added to any existing project
to allow for automatic shutoff. Tons of applications; heating, cooling, ...

D - Flip-Flop Made With A LM556 Timer
23 Aug 2009 ... This circuit is a hybrid - D type Flip-Flop that is constructed from an LM556 -
Dual Timer integrated circuit. The circuit is essentially a ...

One-Shot By IC Quad Timer 558
23 Jul 2007 ... One-Shot By IC Quad Timer LM558 When mention the circuit One Shot friends
at take an interest digital side may know good that how much is it ...

ZN1034E Timer
This entry was posted on Sunday, May 20th, 2007 at 3:23 pm and is filed under Audio - Alarm,
Circuit, Timer. You can follow any responses to this entry ...

Relay Timer switch By IC 555 and 741
29 Aug 2007 ... In Fig.1 see a 100 second delayed turn ON relay RL1 switch, if plug power +12V
in circuit. In Fig.2 see a two range 6-60 second and 1-10 ...

Basic 555 Timer Oscillator
26 Apr 2008 ... The circuit on the left shows the standard astable oscillator circuit for
the NE555N IC. This si the basic circuit that is shown in most ...

555 timer as a switch-mode power supply
27 Dec 2007 ... Most switch-mode power supplies rely on a PWM (pulse-width-modulated)
output that is controlled via voltage feedback. A 555-timer IC can ...

Basic Timer Control with NE555
13 Aug 2008 ... As friends many take an interest the circuit about IC 555 which
be integrated highly popular that circuit. I then lead the circuit sets the ...

Circuit Egg Timer By LM555
22 May 2007 ... Click to View Circuit Egg Timer By 555 This is Easy and Mini Timer Circuit
( Egg Timer) by IC 555. Alarm by Buzzer. This be mini timer ...

simple timer with IC 4093 + 7808
31 Aug 2007 ... The on time of the timer is set by the one shot built with R2/R3 C3 and IC2A:
after pressing pushbutton S1 C3 will be charged slowly through ...

Circuit Egg Timer By 555
IC 555 Circuit, Circuit Egg Timer By 555. ... This is Easy and Mini Timer Circuit
( Egg Timer) by IC 555. Alarm by Buzzer. Circuit Egg Timer by LM555 ...

LM555 Timer Used As A Voltage Comparator Or Schmitt Trigger
22 Oct 2009 ... The next section shows how the LM555 timer could be used as
a voltage comparator or a wide offset Scmitt Trigger. Applications for which it ...

555 timer pulse generator
31 Jan 2008 ... To drive ignition coils is to use a 555 timer pulse generator.
A 555 generates a square wave output that triggers the 2N3055.

Basic Timer using FET 2N3819
8 Sep 2008 ... This circuit be Basic Timer Circuit by use important equipment is FET 2N3819.
By this circuit can can delay long ago arrive at 1.5 minute.

Timer Circuit by FET + Transister
20 May 2007 ... Circuit Timer Circuit by FET + Transister. ... ZN1034E Timer
LED Chaser by IC 4017 + IC 555 ». Timer Circuit by FET + Transister ...

Tan Timer by IC 4060 and IC 4017
26 Oct 2008 ... Six timing positions suited to different skin types Timing affected
by sunlight intensity Six timing positions suited to different skin ...

Touch Switch low cost by Timer IC 555
15 Oct 2008 ... This Touch Switch circuit use a part compares with voltage 2 group,
within the integrated circuit timer LM555 or NE555.

Timer Plus Relay by IC 555
29 Jun 2007 ... This be Timer Plus Relay Circuit by IC 555. When see the circuit also
a little equipment. By the value R1 and C1 perform set the time give ...

Fully Adjustable Pulse Generator By IC Quad Timer 558
29 Jul 2007 ... Fully Adjustable Pulse Generator By IC Quad Timer LM558 Be the circuit
that is valuable very , because frequency pulse fine get freely do ...

stepper motor circuit

2010-04-12T19:22:00.000-07:00

Stepper Motor controller by PIC16F84
9 Jan 2008 ... On these pages, I will introduce a control circuit for stepper motor.
The software of this project is adapted to Embedded Systems(Lab13) for ...

Stepper Motor Driver using L298 and L297
This Step motor controller uses the L297 and L298N driver combination;
it can be used as stand alone or controlled by microcontroller.

Basic Stepper Motor Driver by 74194
19 Mar 2008 ... The following diagram is for the main circuit of the motor driver.
A testing version is shown later on this page.

Stepper Motor Driver by 74194
2 Feb 2008 ... Probably the simplest, reversible drive circuit is the H-Bridge.
Some BEAMbots use H-bridge motor drivers; many more use an H-bridge variant ...

74LS194, 74LS04 drive a stepper motor
19 Sep 2007 ... There are so many ways to drive a stepper motor, Here is another circuit that use
74LS194 4 bit bi-directional universal shift register as a ...

4013 and IRF510 Easy drive a stepper motor
19 Sep 2007 ... Here is easy circuit drive a stepper motor with pulse input.
Use IC 4013 (IC Cmos) and Mosfet IRF510 drive Motor Stepper.

Driving Bipolar Stepper Motors by PIC16F84
4 Feb 2008 ... Stepper motors are devices, which convert electrical impulses into discrete
mechanical rotational movements. In a typical stepper motor, ...

Stepper Motor Driver by SN74194
9 Nov 2007 ... This page features an inexpensive stepper motor driver that could be used
to power slow speed projects on the layout or other hobby ...

Simple Stepper Motor Controller by 4027 , 4070
5 Oct 2007 ... Click to View Circuit and Read More I found this circuit in my files.
I don't know where it came from, but it looks like I photocopied it ...

ULN2003 Control Stepper Motor by Parallel Port
15 May 2008 ... This is an easy to build stepper motor driver that will allow you to precisely
control a unipolar stepper motor through your computer's ...

Stepper Motor Driver Kit
28 Jul 2009 ... The motors are top quality, but how the heck do you drive them without
shelling out a fortune? Lightweight, with Ramsey Super Stepper!

วงจร IC-TL494

2010-03-21T08:55:00.000-07:00

รวมวงจรที่ใช้ไอซี เบอร์ TL494 (tl494 circuits) ไอซีเบอร์นี้ ทำหน้าที่เป็น Pulse-width Modulation Control Circuits เหมาะสำหรับควบคุมความเร็วมอเตอร์ หรือวงจรจ่ายไฟสวิชชิ่ง เพราะใช้เทคนิค PWM ซึ่งนิยมใช้กันมาก

PWM Control Speed Motor 12V By TL494 วงจรควบคุมความเร็วมอเตอร์แบบ PWM
INVERTER 4W by TL494 วงจรอินเวอร์วเตอร์ขนาดเล็ก ด้วยไอซีเบอร์ TL494
POWER SUPPLY ATX PC 200W วงจรจ่ายไฟของเครื่องเพาเวอร์ซัพพลายคอมพิวเตอร์รุ่นเก่า
computer power supply 230W 220V PC เพาเวอร์ซัพพลาย ขนาด 230Watt
power supply regulator switching 0-50V 5A by TL494 , MJ15004 วงจรจ่ายไฟสวิตชิ่งซัพพลายปรับค่าได้ 0-50V 5A
Autoformer Switch-Mode Power Supply by TL494
200W PC power supply switching 110V-220V Computer power supply switching regulated
Old power supply computer by TL494วงจรจ่ายไฟคอมพิวเตอร์เก่าๆ ใช้ไอซี TL494 เป็นอุปกรณ์สำคัญ

Digital circuit

2010-02-22T08:11:00.000-08:00

รวมวงจรดิจิตอลต่างๆ โดยเน้นเป็นลักษณะ Simple digital circuit ที่ง่ายๆ ไว้หลายวงจร เช่น ดิจิตอลลอจิก, กำเนิดสัญญาณ, งานควบคุม,ตั้งเวลา,วงจรนับ,วงจรหารความถี่และอื่นๆ
เช่น

นี่เป็นวงจรโมโนสเตเบิล มัลติไวเบรแตอร์ หรือวงจรวันชอต อีกวงจรที่น่าสนใจ ภายในไอซีเบอร์ CD4538 ประกอบด้วย 2 ตัว ทำงานอิสระดี สามารถกำหนดการหน่วงเวลาได้ RC รายละเอียดเพิ่มเติมในวงจร

สามารถดูวงจรอื่นๆ ได้ digital circuit

Electronic circuits มากมาย

2010-02-17T06:23:00.000-08:00

รวมวงจรอิเล็กทรอนิกส์ต่างๆ มากมาย โดยเน้นที่ไดอะแกรมง่ายๆ และได้นับความนิยมสูง เพียง 25 ประเภท ประมาณ 1,000 schematic
วงจรอินเวอร์เตอร์ power inverter แปลงไฟแบตเตอรี่ เป็นไฟบ้าน AC 220V ใช้งานได้สบาย
วงจรควบคุมมอเตอร์ Control DC Motor, Stepper motor,sevo motor มีหลายวงจร
เกี่ยวกับ IC 555 วงจรชุด 1 วงจรขยายเสียงโอทีแอล เสียงดีไม่แพ้ใคร (มีแผ่นปรินต์ด้วย)
รวมวงจรขยายเสียง home amplifier,high power amp, mosfet amp, transistor amplifier
วงจรควบคุมต่างๆ Control Electronic Circuit, Switch timer,touch Switch,power control
วงจรขยายเสียงรถยนต์ Audio Car Amplifier, แอมป์รถยนต์ มากมายหลายวงจร
วงจรจ่ายไฟเร็กกูเลเตอร์ Switching Power supply Circuit, DC Voltage Regulator Circuit
เกี่ยวกับ หลอดไฟแสงสว่าง วงจร LED Lamp , LED display, Light Flashing
วงจรทีวี และ วงจรมอนิเตอร์ Circuit TV, Monitor Circuit
วิทยุรับส่ง FM transmitter, เครื่องรับ FM , เครื่องส่ง FM (เอฟเอ็ม), วงจรส่งสัญญาณทีวี
เกี่ยวกับแบตเตอรี่ค่ะ Battery Circuit,lithium battery,battery charger,cell battery
วงจร ดีซี ทู ดีซี คอนเวอร์เตอร์ DC to DC Converter Circuit, Step up Voltage
รวมวงจรจ่ายไฟแบบสวิตชิ่ง Switching power supply, Power supply Switching mode regulater
วงจรแอมป์มอสเฟต (Mosfet Amp)
วงจรจ่ายไฟตรงค่าคงที่ แหล่งจ่ายไฟ คงที่ Fix dc power supply Voltage
electronic test equipment วงจรเครื่องมือวัด ทดสอบอิเล็กทรอนิกส์ speed test
วงจรดิจิตอล Digital circuit, Oscilator, Counter, วงจรนับ,วงจรหารความถี่, วงจรผลิตสัญญาณนาฬิกา
เครื่องกันขโมยกันขโมย,home alarm system,home security alarm
วงจรจ่ายไฟกระแสสูงๆ High power current supply, 10A up
รวมวงจรมือถือ Mobile Phone Circuit, Nokia, sony
บทความ: ไมโครคอนโทรลเลอร์
วงจรตรวจวัด ทดสอบ (เช็ก speed test)
วงจร LED Display
บทความ: โครงงานจิ๋ว+แจ๋ว
pcb power supply

Switching Power Supply เครื่องสวิตชิ่งซัพพลายต่างๆ :: Power supply circuitวงจรแหล่งเพาเวอร์ซัพพลาย
High Voltage power supply Small Circuit :: DC Power Supply :: LED Display วงจร LED แสดงผลได้ดี
Power Supply Circuit วงจรจ่ายไฟอีกแบบ :: tone control circuitโทนคอนโทรลเซอร์กิต
Pwm Motor Control ควบคุมความเร็วมอเตอร์ด้วย PWM :: Step Motor Control วงจรควบคุมสเต็บเปอร์มอเตอร์
Burglar Alarm Circuit วงจรกันขโมยอีกวงจร :: เซอร์โวมอเตอร์ วงจรเซอร์โวมอเตอร์คอนโทรล
Electronic Test Equipment วงจรเครื่องมือวัดอีกแบบ :: Home alarm system วงจรระบบกันขโมยในบ้าน
Dimmer circuit วงจรหรี่ไฟอิเล็กทรอนิกส์ :: FM Transmitter วงจรเอ็ฟเอ็มทรานสมิสเตอร์
RF Amplifier วงจรอาร์เอฟ แอมปลิฟลาย :: dc converter step up volt วงจรดีซีคอนเวอร์เตอร์สเต็บอับโวลเต็จ

Voltage Regulator IC :: voltage regulator zener :: lm317 voltage regulator

DC Power supply regulator 38 Volt by 2N3055 :: Mosfet stabilized power supply for Tube Amp :: 12v power supply :: 7805+Mj2955 power supply circuit 5V 5A for digital :: 5V power supply :: 12v 2a power supply

transistor amplifier circuit

2010-02-15T06:46:00.000-08:00

รวมวงจรขยายเสียงที่ใช้ทรานซิสเตอร์เป็นอุปกรณ์สำคัญ มีจุดเด่นที่เสียงนุ่มนวล ฟังไพเราะ ไม่น่าเบื่อ

ช่วยให้ผ่อนคลายดี และราคาประหยัด แต่อาจจะสร้างยากกว่าการใช้ไอซีนิดหน่อยครับ เพื่อความสะดวก

ของท่าน ผมขอแนะนำวงจรแอมป์ทรานซิสเตอร์(transistor amplifier circuit)ที่น่าสนใจ ดังนี้

High volt mini Amplifier with UJT transistor วงจรแอมป์ทรานซิสเตอร์ UJT ที่ใช้ไฟเลี้ยงสูง ร้อยกว่าโวลต์ เป็นไอเดียหนึ่งที่น่าศึกษา

4-Transistor Amplifier for Small Speaker วงจรแอมป์ทรานซิสเตอร์ 4 ตัว ง่ายๆ เหมาะสำหรับทำแอมป์ในตู้ลำโพงขนาดเล็ก

Bipolar Amplifier HIFI OCL 100W by BD317-BD318 วงจรแอมป์ทรานซิสเตอร์ไบโพล่าร์ ไฮไฟ โอซีแอล 100Watt เสียงดี เป็นอย่างไร ลองดูวงจรกันเลยครับ

300Watt audio amplifier HIFI by MJ15003-MJ15004 Transistor หากจะทำแอมป์ทรานซิสเตอร์ให้ออกงาน อวดชาวบ้านได้ก็ต้องชุดนี้เลย ด้วยกำลังขับเพียงพอ 300 วัตต์ งานปาร์ตี้เล็กๆ รับได้ไหวแน่นอน เสียงนุ่มนวลดี แต่ทุ้มแหลมชัดเจน ไม่รองใคร

Easy Amplifier HiFi OCL 150W rms by Transistor นี่เป็นวงจรขยายเสียงกำลังขับ 150 watt rms เสียงดีอีกวงจรหนึ่งครับ

120W rms power amp OCL Transistor bipolar มาอีกแล้ว แอมป์ไบโพล่าร์ กำลังขับ 120 watt ดูแนวคิดวงจกันตามสบายครับ

MJE3055+MJE2955 Power Amplifier 60 Watt Into 8 Ohms

Mini Power Amplifier 30W by TIP141 TIP146มือใหม่ หรือ ท่านที่ชอบฟังเพลงเบา คงชอบวงจรนี้ กำลังขับ 30W แต่เสียงดี ชัดเจน ใช้ทรานซิสเตอร์คู่ดาร์ลิงตัน เบอร์ TIP141 และ TIP146 ทนกำลังไฟฟ้าสูง ขยายกระแสได้เยี่ยมครับ

50W Audio Power Amp by TIP33 TIP34 สำหรับท่านอยากสร้างแอมป์ขนาดกลางๆ ประมาณ 50Watt ลองดูวงจรนี้ก็ดี จัดวงจรลักษณะง่ายๆ แต่เสียงน่าพอใจดี

3W - 5W Class-A Audio Amplifier by BD439 ท่านที่อยากลองแอมป์ คลาส เอ ลองดูวงจรนี้ได้เลย แม้กำลังขับต่ำมากๆ แต่ด้วยเป็นแอมป์คลาสเอ คงสนองความเสียงได้ดี เหมาะสำหรับศึกษาวงจรและสร้างเล่นง่ายๆ ครับ

24 Watt Class A Amplifier by 2N3055 นี่เป็นแอมป์คลาสเอ อีกวงจรที่สนใจ กำลังขับ 24Watt จึงเสียงดีไม่น้อย ใช้ทรานซิสเตอร์เบอร์ยอดนิยมตลอดกาลอีกด้วย เบอร์ 2N3055 เพราะสำหรับท่านที่อยากฟังเสียงไพเราะในห้องขนาดเล็กๆ ครับ

10-14W Class A amplifier by TIP3055 วงจรนี้เหมาะสำหรับมือใหม่อยากลองแอมป์ class A ง่ายๆ กำลังขับไม่สูงนักประมาณ 14Watt

10 watt RF amplifier for 18MHz by 2SC1969

30W Class AB amplifier by TIP2955 + TIP3055 วงจรนี้เหมาะสำหรับสร้างไว้ฟังในห้องเล็กๆ หรือเป็นแอมป์เปิดฟังเพลิน เครื่องแรก ที่สร้างเอง ภูมิใจดีครับ

Power Amplifier Class A 25W วงจรแอมป์คลาส เอ ขนาด 25Watt อีกวงจร ที่น่าสนใจ

3W HI-FI Stereo Amplifier by 2N1613 วงจรแอมป์เล็กๆ อีกวงจรที่ออกแบบได้ดี เสียงใช้ได้เลยครับ

100W Audio Amplifier Transistor by BDW84 , BDW83 อีกวงจรแอมป์ 100 วัตต์ ที่น่าพลาด ดูแนวคิดวงจได้เลยครับ

2-TRANSISTOR AUDIO AMPLIFIER by BC108 วงจรแอมป์ทรานซิสเตอร์จิ๋ว เหมาะสำหรับงานขยายเสียงเล็กๆ ที่ท่านอยากใช้ทรานซิสเตอร์ หรือ ใช้เพื่อการศึกษาก็ดีทีเดียวครับ

Power Amplifier OCL 50W by BD250C , BD249C

Amplifier Class AB Hi-Fi 70W by MJ15022 , MJ15023 วงจรแอมป์ขนาด 70วัตต์ เสียงดี เพราะเป็นคลาส เอบี ทุ้มแหลมสะใจ วงจรออกแบบได้ดีพอสมควร ปัญหาเรื่องความเพี้ยนของเสียงน้อยด้วยครับ

60W Bass Amplifier by MJ11016 นี่เป็นแอมป์เสียงทุ้มโดยเฉพาะ เพราะสำหรับสร้างไว้ขับลำโพงเสียง bass วงจรทรานซิสเตอร์ ก็เสียงไม่ใช่น้อย รองรับระบบเสียงโฮมเทียร์เตอร์ได้สบายครับ

Power Amplifier OCL 60W by 2N3055 with PCB วงจรแอมป์ขนาด 60Watt จัดวงจรมาดี ใช้ทรานซิสเตอร์ยอดนิยม หมดปัญหาเรื่องหาอะไหล่ แน่นอนครับ

Power Amplifier OCL 100w With MJ802, MJ4502 วงจรนี้ เป็นลักษณะ โอซีแอล วงจรแม้ว่า จะเก่าแก่มากแล้ว แต่เสียงดี ทนทานใช้ได้ทีเดียว ควรมีวงจรป้องกันลำโพงไว้ด้วย ทุ้มแหลมไพเราะน่าฟังมากครับ

Circuit Power Amplifier OTL 50W by 2N3055 วงจรแอมป์โอทีแอล 50Watt แม้ว่าเป็นวงจรเก่า แต่เสียงดีใช้ได้ทีเดียว มีดีเรื่องความดังไม่รองใคร และทนทานเป็นเยี่ยมครับ

วงจรวิทยุรับส่ง rf circuits

2010-02-15T03:22:00.000-08:00

รวมวงจรวิทยุรับส่ง ต่างๆ หลายวงจร
rf circuits rf impedance matching rf amplifier circuit rf transmitter
rf linear amplifier rf receiver circuit rf detector circuit

500mW FM Transmitter by BC549 วงจรส่งสัญญาณวิทยุ FM ขนาด 500mW ใช้ทรานซิสเตอร์ BC549

High Quality 200mW FM Transmitter by BF199 วงจรเครื่องส่งสัญญาณวิทยุ FM ขนาด 200mW คุณภาพสูง ด้วยทรานซิสเตอร์ BF199

50-300mW FM Transmitter by BC549 วงจรส่งสัญญาณวิทยุ FM ขนาด 50mW ถึง 300mW ด้วยทรานซิสเตอร์ เบอร์ BC549

6 Transistor Super Regen Receiver by BC548 วงจรรับสัญญาณ Super Regen รุ่นทรานซิสเตอร์ BC548 จำนวน 6 ตัว

BH1417 Stereo PLL FM Transmitter วงจรส่งสัญาณ FM ระบบสเตอริโอ ด้วยไอซีเบอร์ BH1417

BA1404 HI-FI Stereo FM Transmitter วงจรส่งสัญญาณ FM ระบบสเตอริโอ ไฮไฟ ด้วยไอซี BA1404

Long range FM transmitter วงจรส่งสัญญาณวิทยุ FM ระบบ Long range

Coil-less FM Transmitter by IC 40106 วงจรส่งสัญญาณวิทยุ FM ระบบ Coil-less ด้วยไอซีดิจิตอล 40106

40 Watt Amplifier For FM Broadcast by MRF171A วงจรส่งสัญญาณระบบ FM กำลังขยายกำลัง 40W ด้วย MRF171A

TV Signal Amplifier by BFR90, BFR91, BFW92 วงจรขยายสัญญาณทีวี ด้วยทรานซิสเตอร์ BFR90,BFR91,BFW92

FM Amplifier 50Watt by BLY90 วงจรขยายสัญญาณวิทยุ FM ขนาด 50W เบอร์ BLY90

FM Transmitter 4W by 2N3553 วงจรส่งสัญญาณวิทยุ FM ขนาด 4W ด้วยทรานซิสเตอร์เบอร์ 2N3553

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ยังมีวงจรวิทยุรับส่งอื่นๆ อีกมากมาย ดูต่อในเว็บ www.eanic.com คลิ๊ก

FM Transmitter 3W by 2N3553 วงจรส่งสัญญาณวิทยุ FM ขนาด 4W ด้วยทรานซิสเตอร์เบอร์ 2N3553

SW RF Pre-Amplifier with 2N3819 วงจรขยายสัญญาณวิทยุ SW ด้วยทรานซิสเตอร์เบอร์ 2N3819

VHF Band 2 Radio Spectrum tuning วงจร Spectrum tuning ย่าน VHF 2 Band

Automatic Retransmitting Makeshift Repeater

4 Watt FM Transmitter with 2N3553 วงจรส่งสัญญาณวิทยุ FM ขนาด 4W ด้วยทรานซิสเตอร์ 2N3553

500W HF linear amplifier วงจรขยายสัญญาณแบบ HF ลิเนียร์ ขนาด 500W

FM Transmitter with 2N2222 วงจรส่งสัญญาณวิทยุ FM ด้วยทรานซิสเตอร์ 2N2222

1.5 Volt Tracking FM Transmitter วงจส่งสัญญาณ FM Tracking ไฟเลี้ยง 1.5V

VHF Video Transmitter วงจรส่งสัญญาณวีดีโอ VHF แบบหนึ่ง

RF Power Amplifier 1.3W to 6W by 2SC1970 วงจรขยายสัญญาณวิทยุ กำลัง 1.3W ถึง 6W

An AM RF Amp for Internal Antennas เกี่ยวกับวิทยุเอเอ็ม

FM TRANSMITTER By 2N2222 วงจรไมค์ลอยทรานซิสเตอร์ 3 ตัว ไฟเลี้ยง 3V เอง

2-Frequency Oscillator By IC Tone Decoder 567 วงจรผลิตความถี่ 2 ความถี่ด้วยไอซี NE567

60 WATTS LINEAR AMPLIFIER with IRF840 วงจรบูสเตอร์ ขยายสัญญาณวิทยุ ขนาด 60W ด้วยไอซี IRF840

AM portable radio receiver by ZN414 IC วงจรรับเอเอ็มด้วยไอซี ZN414

Video to RF Modulator 189 MHZ วงจรแปลงสัญญาณภาพ Video เป็นสัญญาณวิทยุ ความถี่สูง 189MHZ

VHF Video Transmitter วงจรส่งสัญญาณวีดีโอ ทางสัญญาณวิทยุ ความถี่ VHF

วงจรเกี่ยวกับขยายสายอากาศเอฟเอ็ม Active FM Antenna Amplifier by C2570

4 Watt FM Transmitter with 2N3553 วงจรส่งวิทยุเอฟเอ็ม (ไมค์ลอย) 4W ด้วยทรานซิสเตอร์ 2N3553

500W HF linear amplifier เกี่ยวกับวงจรขยายกำลังส่งสัญญาณวิทยุ 500W แบบลิเนียร์

FM Stereo Transmitter with IC BA1404 เครื่องส่งเอฟเอ็มเสตอริโอ

Linear FM 30Watt ชุดวงจรเกี่ยวกับส่งความถี่วิทยุ FM ขนาด 30W

Easy Radio Wave Alarm วงจรเตือนภัยด้วยสัญญาณวิทยุ

UHF Preamplifier by MPSH10 transistor ขยายสัญญาณความถี่ย่าน UHF

TV Transmitter เครื่องส่งสัญญาณทีวีง่ายๆ น่าสนใจดีจ๊ะ

FM Transmitter with Op-amp เครื่องส่ง (ไมค์ลอย) วิทยุเอฟเอ็ม ด้วยไอซี ออบแอมป์

One Watt 2.3 GHz RF Amplifier using a MRF2001(Image)

RFI Suppression Techniques in DP83950A (RIC) Based Systems(NEW)

RF Frequency Linear Tuning Varactors (PDF File)(NEW)

Simple and Inexpensive High-Efficiency Power Amplifier Using New Apt MOSFETs(NEW)

small Metronome using 2N3904

2009-09-02T10:06:00.000-07:00

http://www.eleccircuit.com/small-metronome-using-2n3904/

Infrared Intruder Alarm

2009-08-30T10:03:00.000-07:00

This the circuit warns the trespasser infrared system or Infrared Intruder Alarm circuit that interesting. By when there is a person passes or cut the light infrared.

http://www.eleccircuit.com/infrared-intruder-alarm/

Two Tone Alarm with IC LM3900

2009-08-24T10:46:00.000-07:00

http://www.eleccircuit.com/two-tone-alarm-with-ic-lm3900/

Low pass filter circuit 10KHz using uA741

2009-08-23T06:37:00.000-07:00

http://www.eleccircuit.com/low-pass-filter-circuit-10khz-using-ua741/

Small IC Amplifier 2 watt using LM380 | Circuit Project Electronic

2009-08-17T08:15:00.000-07:00

Small IC Amplifier 2 watt using LM380 | Circuit Project Electronic

Compares with sound level tool | Circuit Project Electronic

2009-08-07T07:45:00.000-07:00

Compares with sound level tool | Circuit Project Electronic

Low impedance mini amplifier | Circuit Project Electronic

2009-08-01T11:42:00.000-07:00

Low impedance mini amplifier Circuit
This circuit can apply to signal sound source that has low impedance , such as from 4-16 ohm size loudspeakers or telephone earphone that use to replace

Unused 8051 pin gets assignment

2008-10-27T00:10:00.000-07:00

In an 8051-based system without external program memory, the program-store enable (PSEN) pin is useless. However, you can indirectly control this pin using software. To do so, you execute the move-constant- (MOVC-) instruction-implementing table look-up. By accessing locations in external program memory (which is actually nonexistent), you can produce pulses on the PSEN line without disturbing program flow. Although you need a register for storing output data, you don’t have to install a decoder.
source:http://edn.com/archives/1996/010496/01di7.htm

A serial to parallel converter using the AT89C2051

2008-10-26T23:55:00.000-07:00

The example program included with the PG2051 evaluation kit is a basic serial to parallel converter written in 8051 assembler. This is probably a good example of the uses to which an AT89C2051 can be put - it would be hard to get a serial to parallel converter much simpler than the single 20 pin IC in this circuit. The program is meant to serve as a useful example of 8051 serial routines and other programming, whether or not you actually need a serial to parallel converter.
Source: http://airborn.com.au/serial/sertopar.html

Accelerometer Schematic

2008-10-25T09:12:00.000-07:00

Below is a rough schematic of the layout of the accelerometer PC board looking from the component side. The microcontroller is an Atmel AT89S8252, an 8051 clone. This microcontroller is in-circuit programmable using an SPI interface. The SPI pins are also used to drive the MMC. To permit the dual use there is a jumper block (located below the 74AHC244, marked "P" and "R") that allows the pins to be connected for programming (P) or running the code (R).
Source:http://www.randomuseless.info/accelerometer/schematic/schematic.html

Combine two 8-bit outputs to make one 16-bit DAC

2008-10-25T09:11:00.000-07:00

Inexpensive, 16-bit, monolithic DACs can serve almost all applications. However, some applications require unconventional approaches. This Design Idea design concerns circuitry I recently designed for a tunable-diode laser spectrometer for a Mars-exploration application. The control circuitry included two 16-bit DACs that interface to the radiation-hardened, 8051-variant 69RH051A microcontroller.
Source:http://www.edn.com/article/CA454640.html

MIDI Drum Machine Project

2008-10-25T09:08:00.000-07:00

The MIDI Drum Machine began in the Fall of 1991 as a project for a microprocessor system design course, shortly after I wrote PAULMON1, the 8051 monitor/debugger. A friend, Rod Seely, both a musician and electronics hobbiest suggested I design something using the Musical Instrument Device Interface, MIDI, that would be COOL and would work together with his collection of MIDI keyboards and synthesizers. Of course, I wanted to build something that could end up as a finished commercial product.
Source :http://www.pjrc.com/tech/midi-drums/drum-intro.html

Low-Cost Anemometer Fights Dust

2008-06-26T11:33:00.000-07:00

This application note describes a low-cost circuit that can detect when a chassis fan filter has become clogged with dust. It does this by using a temperature sensor to determine the rate of cooling of a transistor in the air path of the cooling fan, thereby implementing a simple thermal anemometer.

source: http://pdfserv.maxim-ic.com/en/an/AN844.pdf

LX1970 VISIBLE LIGHT SENSOR

2008-06-26T11:29:00.000-07:00

The LX1970 light sensor can be used in conjunction with an LCD Front or Back Light Controller such as the LX1992 for LEDs or the LX1689 for CCFLs. This application note describes how to design in the LX1970.

Source: http://www.microsemi.com/micnotes/1403.pdf

AM portable radio receiver by ZN414 IC

2008-06-21T07:14:00.000-07:00

An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.

Read More

Micro Power AM Broadcast Transmitter

2008-06-21T07:11:00.000-07:00

In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a capacitor/resistor combination. A 100pF capacitor is used in place of the crystal for VFO operation. Amplitude modulation is accomplished with a second transistor that controls the DC voltage to the output stage.

Read more

LM3647 Reference Design

2008-03-17T02:43:00.000-07:00

The LM3647 provides a single-chip charge management solution for Nickel Cadmium, Nickel Metal Hydride and Lithium-Ion cells. The device handles the entire charging process from rejuvenating deeply discharged cells to providing a number of charge termination and maintenance options. The LM3647 Demo Board allows users to create a battery charging solution with little effort.

Link : http://www.national.com/an/AN/AN-1165.pdf

7.2 Volt Field Charger

2008-03-17T02:41:00.000-07:00

The unit is novel as it’s display graph shows you the time the battery has been charging in 2 minute intervals up to 16 minutes when finished.... read more

Self-heated transistor digitizes airflow

2008-03-10T20:39:00.000-07:00

A sensitive and reliable way to measure airflow is to exploit the predictable relationship between airspeed and the heat dissipated by a sensor exposed to the flow while being held at a constant temperature differential above ambient. The power required to maintain the elevated sensor temperature is proportional to the square root of the airspeed (King's law). The popular hot-wire anemometer uses this principle, but suffers from the disadvantage of using a relatively fragile airflow sensor, a thin metallic filament.

Link source: http://www.edn.com/archives/1996/031496/06di3.htm
Thank : www.next.gr

Transistor and FVCs make linear anemometer

2008-03-10T20:37:00.000-07:00

A previous Design Idea presented a simple flow-to-frequency transducer that easily fits into mP-based measurement systems (Reference 1). You can accumulate and linearize its frequency output by using software without the need for ancillary circuitry. In other applications, however, you might prefer a linearized analog output.

Link source : http://www.edn.com/archives/1996/092696/20di4.htm
Thank www.next.gr

12-bit converter upgrades µC's ADC

2008-02-13T15:19:00.000-08:00

The simple circuit in Fig 1 and an accompanying software routine let you easily substitute a multichannel 12-bit ADC for the 8-bit ADC internal to the 87C752 µC. A single assembly can then implement both the low- and high-performance version of a system. A socket lets you plug in the external ADC when you need it; otherwise, you plug in the network of 10 100V resistors. At power-up, the µC executes a routine that looks for the external converter.

Source Link : http://www.edn.com/archives/1994/070794/14di5.htm

18-bit ADC uses PC's serial port

2008-02-13T15:17:00.000-08:00

A PC usually requires a plug-in ADC card to process analog signals. However, with the circuitry in Figure 1, a PC can communicate with an 18-bit ADC through its serial port. The port provides both positive and negative power supplies as well as control signals. IC1 is an 18-bit MAX132 ADC with a serial interface. It requires three input control signals, , DIN, and SCLK, and emits serial data, DOUT, and EOC (end-of-conversion) signals.

Source Link : http://www.edn.com/article/CA159691.html

2-channel ADC tags its own output

2008-02-13T15:16:00.000-08:00

The circuit in Fig 1 shows a simple way to operate a 1-MHz, 12-bit ADC (IC1) in DMA mode while alternating between its two analog-input channels. The converter operates continuously, driven by the 1-MHz clock on the S/H input. Tying RD and CS low ensures that data are always present on the ADC's output bus. The outputs of the 74HC74 flip-flop, IC2, change state on the rising edge of the end-of-conversion (EOC) signal.

Source Link : http://www.edn.com/archives/1994/042894/09di4.htm

4-bit µP's A/D converter decodes keypad's inputs

2008-02-13T15:13:00.000-08:00

Fig 1 shows a Mitsubishi M50927-XXXSP/FP 4-bit microcontroller decoding a 4×4 keypad using only four digital I/O lines instead of eight. Saving four of a 4-bit µC's precious I/O lines couild be significant. The 4-bit µC's ADC provides the key to the savings. The µC's output lines, F1 through F4, energize the keypad's column lines one at a time via 74HC4049 buffer/ driver. If a user presses a key, the µC's ADC reads an analog voltage coresponding to the row of the pressed key.

Link Source:http://www.edn.com/archives/1994/101394/21di6.htm

DPP adds versatility to VFC

2008-02-07T23:27:00.000-08:00

The basic VFC (voltage-to-frequency converter) in Figure 1 comprises an integrator (IC1) and a Schmitt-trigger circuit (IC2). The integrator converts the dc input voltage, VIN, to a linear voltage ramp, and the Schmitt trigger sets the limits of the integrator's output voltage. Feedback around both circuits provides the condition for oscillation. The DPP (digitally programmable potentiometer) in Figure 2 adds programmable limits to the Schmitt trigger and adds two powerful features to the VFC.

Source: http://www.edn.com/article/CA257049.html

40KHz Voltage to Frequency Converter

2008-02-07T23:24:00.000-08:00

This circuit was designed to frequency modulate a 40KHz carrier, using human voice frequencies. A common flip/flop is used at the core of the circuit.

Source:http://www.discovercircuits.com/DJ-Circuits/vco1.htm

Voltage Monitor by 741

2008-02-07T06:36:00.000-08:00

Parts List

D1 LED
R1 1.2k Resistor
R2 10k Var. Resistor
U1 UA741 OP AMP

Description

When the input voltage is 0 the LED glows. The LED stops glowing when the voltage rises to the level determined by R2. Reverse + and - pins to reverse operating mode. To set voltage at which LED goes off, (1) Set 0V at input. (2) Set input voltage at desired level. (3) Adjust R2 to point right after LED goes out.

author: Paul Stilo

Logic Probe by 74LS47

2008-02-07T06:30:00.000-08:00

This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. ...

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site reciprocates

2008-02-07T06:22:00.000-08:00

Binoculars
Shopping and Rating the best binoculars online.

FM Transmitter Bug

2008-02-07T03:32:00.000-08:00

This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The coil is four turns of 18swg wire wound around a quarter inch former. The aerial tap is about one and a half turns from the supply end. Audio sensitivity is very good when used with an ECM type microphone insert. David's email : radio_david@yahoo.com

Source: http://www.electronics-lab.com/projects/rf/002/index.html

Smart Phone light

2008-02-07T03:30:00.000-08:00

The circuit is fully isolated from the phone lines and it draws current only when the phone rings. The circuit provides automatic switching on of a lamp during darkness when the phone is kept in a place such as the bedroom. The lamp can be battery powered to provide light during power failure or load shedding. This avoids delay in attending to a call. The light switches off automatically after a programmable time period and it needs no attention at all. If required, the lamp lighting period can be extended by simply pressing a pushbutton switch (S1). The first part of the circuit functions as a ring detector. When telephone is on-hook, around 48V DC is present across the TIP and RING terminals. The diode in the opto-coupler is ‘off’ during this condition and it draws practically no current from he telephone lines.

Source: http://www.electronic-circuits-diagrams.com/telephonesimages/telephonesckt12.shtml

Soft Musical Telephone Ringer by UM66T

2008-02-07T03:22:00.000-08:00

The incoming ring is detected by transistor T1 and components wired around it. In absence of ringing voltage, transistor T1 is cut off while transistor T2 is forward biased as resistor R2 is returned to the positive supply rails. As a result collector of transistor T2 is at near-ground potential and hence IC1 (UM66) is off. Also capacitor C2 is charged to a slightly positive potential. During positive half of the ringing voltage, diode D1 forward biases transistor T1 and rapidly discharges capacitor C2 to near ground potential and cuts off transistor T2 which, in turn, causes IC1 to be forward biased and music signal is applied to base of transistor T3 which drives the speaker. During negative half of the ringing voltage, capacitor C2 cannot charge rapidly via resistor R2 and hence transistor T2 remains cut off during the ringing interval.

Source: http://www.electronics-lab.com/projects/telephone/003/index.html

Time Delay Relay II by IC 4011

2008-01-06T07:25:00.000-08:00

When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. ...

Link Time Delay Relay II by IC 4011

Time Delay Relay by 555

2008-01-06T07:19:00.000-08:00

A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. ...

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Antenna tuning pdf file

2007-11-21T19:20:00.000-08:00

Antenna tuning pdf file

Source : http://www.educypedia.be/electronics/antennawifi.htm

Antennas & Transmission Lines

2007-11-21T19:18:00.000-08:00

Antennas & Transmission Lines omnidirectional antenna, biquad antenna, cantenne, horn antenna, Yagi Antenna, pdf file

Source : http://www.educypedia.be/electronics/antennawifi.htm

Antennas for 2.4 GHz WiFi

2007-11-21T19:16:00.000-08:00

Antennas for 2.4 GHz WiFi wide angle antenna for 2.4 GHz WiFi, sector antenna for 2.4 GHz WiFi, Modified 3D Corner Reflector Feed for SAT TV offset parabolic dish, 2 el. BiQuad Feed for Offset Dish at 2.4 GHz WiFi, ...

Link : Antennas for 2.4 GHz WiFi

Antennetechniek voor WISPs

2007-11-21T19:15:00.000-08:00

Antennetechniek voor WISPs biquad, cantenne, Biloop antenne

Source : http://www.educypedia.be/electronics/antennawifi.htm

Antenna construction

2007-11-21T19:11:00.000-08:00

Antenna construction Quarter wave omnidirectional antenna for 2.4 GHz, omnidirectional antenna, Omnidirectional collinear antenna for 2.4 GHz, Biquad antenna for 2.4 GHz, Biquad antenna as a 2.4 GHz feeder for a Parabolic Dish, Can antenna for 2.4 GHz, pdf file

Source : http://www.educypedia.be/electronics/antennawifi.htm

Antenna Basics

2007-11-21T19:09:00.000-08:00

Antenna Basics 1/4 Wavelength Ground Plane, Yagi antenna, horn antenna, Parabolic Dish, focus f = D²/16.c ; D= diameter of the parabola, c is depth of the parabola, BiQuad antenna, pdf file

Source : http://www.educypedia.be/electronics/antennawifi.htm

802.11 Wireless LAN Cards

2007-11-20T20:24:00.000-08:00

802.11 Wireless LAN Cards schematics

Source : http://www.educypedia.be/electronics/antennawifi.htm

2.4 GHz WLAN Radio Interface

2007-11-20T20:23:00.000-08:00

2.4 GHz WLAN Radio Interface IEEE 802.11b radio interface, Radio signal propagation at 2.4 GHz, Link budget calculations, pdf file

Source : http://www.educypedia.be/electronics/antennawifi.htm

2.45 GHz power amplifier with the BFG480W

2007-11-20T20:22:00.000-08:00

2.45 GHz power amplifier with the BFG480W At a frequency of 2.45 GHz, a supply voltage of 3.0 V, and a control voltage of 3.0 V, the amplifier delivers an output power of 19 dBm at an input power of 8 dBm, with a power added efficiency of 38 %, pdf file

Source : http://www.educypedia.be/electronics/antennawifi.htm

2.4 GHz low noise amplifier with the BFG480W

2007-11-20T20:20:00.000-08:00

2.4 GHz low noise amplifier with the BFG480W This application note gives an example of a 2.4 GHz LNA with the BFG480W. Because this LNA design has a high third order intercept value of 17 dBm (measured at input), it can be used for Wireless Local Area Network (WLAN) front-end and Wireless Local Loop (WLL) applications, pdf file

Soruce : http://www.educypedia.be/electronics/antennawifi.htm

2.4GHz AntennaAlignement

2007-11-20T20:16:00.000-08:00

2.4GHz AntennaAlignement This paper attempts to provide some insight into the nature of radio propagation in that part of the spectrum (upper VHF to microwave) used by experimenters for high-speed digital transmission. It begins with the basics of free space path loss calculations, and then considers the effects of refraction, diffraction and reflections on the path loss of Line of Sight (LOS) links

Source : http://www.educypedia.be/electronics/antennawifi.htm

22.5dBm 2.4GHz Linear Power Amplifier for 802.11b WLAN Applications

2007-11-15T20:08:00.000-08:00

22.5dBm 2.4GHz Linear Power Amplifier for 802.11b WLAN Applications provides a flat gain response over the entire 2.4GHz to 2.5GHz ISM band, industrial, scientific and medical radio bands

How to buy Motorola Talkabout T9500 2-Way Radio

2007-11-15T19:52:00.000-08:00

The Motorola® I9550 Camo 25 Mile two-way radio is ready for your long distance communication needs. The unit is iVOX enabled for easy to use, hands-free communication without the need for an audio accessory. The NOAA Weather Alert Radio provides you...

Read full description

Morse Code Practice Oscillator

2007-11-09T00:45:00.000-08:00

This simple code practice oscillator project for beginners to Continuous Wave Morse Code uses a 555 timer to generate a dit or dah sound when the key is pressed.

Good Link
More circuit by IC 555
More about Oscillator Generator
More about Squarewave Oscillator circuit

Read link : http://www.electronics-project-design.com/CodePracticeOscillator.html

Ham Radio Circuit - Morse Code Filter Project

2007-11-09T00:37:00.000-08:00

This project will help to filter out the interference signal and ensure that the signal received from the Morse code station stand out.

Read more : http://www.electronics-project-design.com/HamRadioCircuit.html

USB Battery Charger Circuit

2007-11-09T00:36:00.000-08:00

This application circuit uses the MCP73853/MCP73855 linear charge management controllers for cost sensitive applications. They are specially designed for USB applications and adhere to all the USB specifications governing the USB power bus.

Read more : http://www.electronics-project-design.com/BatteryChargerCircuit.html

DC DC Converter Circuit

2007-11-09T00:35:00.000-08:00

Get an output of 0.6V to 5.0V DC 10A from an input voltage range of 4.5V to 20V DC using Linear Technology DC DC Converter Module.

Read more : http://www.electronics-project-design.com/DC-DC-Converter-Module.html

Constructing a 12V DC Switch Mode Power Supply

2007-11-09T00:33:00.000-08:00

Construct a 12 VDC, 120 mA switch mode supply from AC source of 85-265 VAC.

Good Links
More Circuit construct a power supply
More circuit switch mode power supply
More Switching power supply Circuit
More about 12V power supply circuit

souec: http://www.electronics-project-design.com/SwitchModePowerSupply.html

Constructing a Dual Polarity Supply

2007-11-09T00:32:00.000-08:00

supply. With the appropriate choice of transformer and 3-terminal voltage regulator pairs you can easily build a small power supply delivering up to one amp at +/- 5V, +/- 9V, +/- 12V, +/-15V or +/-18V.

Read more : http://www.electronics-project-design.com/DualPowerSupply.html

Variable DC Supply

2007-11-09T00:31:00.000-08:00

Another version of variable DC supply using LM317 that uses an LED to show the ON/OFF status of the supply.

Read more : http://www.electronics-project-design.com/VariableDCPowerSupply.html

Constructing a universal DC Supply

2007-11-09T00:30:00.000-08:00

This is a basic, text-book, variable DC supply voltage regulator circuit using an LM317 from input supply of 7-20 V AC or 7-30V DC . The output voltage can be set to anywhere in the range 1.5V to 30V.

Read more : http://www.electronics-project-design.com/UniversalPowerSupply.html

Simple fixed 5V DC Power Supplies Project

2007-11-09T00:27:00.000-08:00

This project provides the schematic and the parts list needed to construct a simple Supply from an input supply of 7-20 V AC or 7-30V DC. Two DC voltage outputs are available; 5V and variable from 5V upwards.

Related Links
More about 5v dc supply circuit
7805+Mj2955 power supply 5V 5A for digital circuit.
Simple 5V 1A Switching regulator by IC LM2575-5.0
5V 5A switching regulator for digital by LM2678

Source : http://www.electronics-project-design.com/DCPowerSupply.html

Variable 5 to 20V DC Supply

2007-11-09T00:25:00.000-08:00

Build your own 5-20V DC power supply using National Semiconductor LM2941 low dropout voltage regulator.

Read more : http://www.electronics-project-design.com/voltageregulator.html

Variable 5 to 15V DC Supply

2007-11-09T00:20:00.000-08:00

This is a simple DC regulated supply project using 7805 voltage regulator to obtain a variable DC voltage range from 5V to 15V.

Read more : http://www.electronics-project-design.com/RegulatedPowerSupply.html

Variable 2 to 25V DC Supply

2007-11-09T00:13:00.000-08:00

This project uses a LM338 adjustable 3 terminal regulator to supply a current of up to 5A over a variable output voltage of 2V to 25V DC.

Related Links
More about variable dc supply circuit
More about DC Voltage Regulator Circuit
More about Shunt Regulator Circuit
More about Dual Power Supply Circuit

Source:
http://www.electronics-project-design.com/PowerSupplySchematic.html

CAPS PROVIDE VOLTAGE BOOST TO SERIES REGULATOR

2007-11-06T06:03:00.000-08:00

CAPS PROVIDE VOLTAGE BOOST TO SERIES REGULATOR
This circuit adds some capacitors and diodes to a traditional transformer type series regulator circuit to extend the normal operating range. It can insure regulation during low line voltage conditions or it can squeeze a few more watts out of a plug-in-the-wall power adapter power supply.

240VAC TO 5VDC POWER SUPPLY

2007-11-06T06:02:00.000-08:00

240VAC TO 5VDC POWER SUPPLY
This is simple way to power some 5v logic from a 240vac source. If a 120vac power adapter is used, the circuit will also work for 120vac power lines.

LOW POWER 12,000 VOLT POWER SUPPLY

2007-11-06T06:00:00.000-08:00

LOW POWER 12,000 VOLT POWER SUPPLY
If you need about 12,000 volts DC for an ion generator this circuit might be the ticket. It draws power from the 120vac power line but it uses a small 6KV camera flash trigger coil. The output signal is isolated from the power line. Although the circuit can only deliver about 5uA of current it can produce dangerous shocks, so be careful.

MINIATURE ISOLATED AC/DC POWER SUPPLY

2007-11-06T05:58:00.000-08:00

MINIATURE ISOLATED AC/DC POWER SUPPLY
This circuit uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer. The voltage spikes produced through the transformer are rectified, filtered and regulated. A very common 8 ohm audio impedance matching transformer can be used for the transformer