Logo

Alarms and Indicator Circuit diagrams:

* Power supply failure alarm
* Theft preventer alarm
* Rain Alarm
* A simple electronic buzzer
* Water Level Indicator with alarm
* Melody generator for greeting cards
* Brakelight Flasher
* Car anti theft wireless alarm.
* Fire Alarm
* Daylight Alarm
* Factory Siren
* Police Siren
* Big Ben Sound
* Beeper
* Infra-red (IR) beam alarm/ proximity detector

Audio Circuits

* Stereo Channel Selector
* Low cost intercom using transistors
* Infrared Head Phones
* Use the CD-ROM drive as a audio CD player without the computer
* Audio Visual Indicator for Telephones
* Ultrasonic pest repellent
* Sound Controlled Filp Flop
* Ultrasonic Switch
* Digital Volume Control
* Audio Light Modulator

Circuits for Cars/Motorcycles:

* Charge Monitor for 12V lead acid battery
* Wiper Speed Control
* Dome Light Dimmer for Cars
* Car anti theft wireless alarm.

Computer/PC Hardware Circuits:

* Control electrical appliances using PC
* Simple Analog to Digital Converter
* PC based Frequency Meter
* 7 segment rolling display using PC

Design Ideas:

* "Soft" ON/OFF switch

Fun/Games Circuits

* Electronic Scoring Game
* JAM(Just A Minute) Circuit
* Flashy Christmas Lights
* TV remote control blocker

Signal/Sequence/Misc. Generators

* Simple IF Signal Generator

Home/Garden related Circuits

* Ultrasonic Pest Repeller
* Programmable Digital Code Lock

Lights & LED Circuits

* Light Flasher(blinking lights)
* Automatic Dual output Display
* Emergency Light
* Automatic Room Lights
* Running Message Display
* Christmas Star
* Audio Light Modulator
* Optical toggle switch using a single Chip
* Flashy Christmas Lights
* Dancing Lights
* Alternating Flasher

Motor Circuits

* Automatic Speed Controller for fans & Coolers
* Soft Button type Motor Direction Controller
* Super simple stepper motor controller
* Discrete component motor direction controller

Music related Circuits

* Digital Volume Control

Oscillator Circuits

* Simple variable frequency oscillator
* Sawtooth wave generator

Power Supply (PS) Circuit diagrams

* Negative supply from single positive supply
* Self switching Power Supply
* Ultra low drop linear voltage regulator
* Over / Under Voltage Cut-Out
* High and Low Voltage Cutout with delay and Music
* High Voltage, Low Current Supply
* A simple Car Battery Charger

Radio,transmitter,receiver circuits

* Car anti theft wireless alarm.
* Long range FM transmitter
* Remote control using VHF modules
* 40 meter Direct Conversion Receiver
* Powerful AM transmitter
* Radio Remote Control using DTMF
* FM transmitter
* Coilless FM transmitter !

Remote Control Circuit diagrams

* Remote control using VHF modules
* Remote control using telephone
* A simple Remote control Tester
* Clap Activated Remote
* Radio Remote Control using DTMF
* Ultrasonic switch

Robotics related Circuits

* Magnetic proximity sensors
* Color Sensor
* Super simple stepper motor controller

Sensors

* Magnetic proximity sensors
* Dew sensor
* Color Sensor
* Metal Detector
* Optical toggle switch using a single Chip
* Sound Controlled Filp Flop
* Ultrasonic switch
* Light Barrier Detector

Telephone Circuit diagrams

* Telephone Ringer using 556 dual timers
* Two line intercom plus a telephone changeover switch
* Telephone line based audio muting and light on circuit
* Having secrecy in parallel telephones
* Telephone call meter using calculator & COB
* Phone Broadcaster
* Conversation Recorder
* Multipurpose Circuit for telephone
* Remote control using telephone
* Cordless phone backup
* Telephone Number Display
* Smart Phone light
* Telephone Headgear
* Telephone Line Vigilant
* Audio Visual Ringer
* Off line Telephone tester

Test & Measurement Circuits

* High Resistance Voltmeter
* A simple Remote control Tester
* Contactless Mains Voltage Indicator
* Zener Diode Tester