Electronics Projects With Electronics Circuits

Alarms/Indicators

Power supply failure alarm
Theft preventer alarm
Rain Alarm
A simple electronic buzzer
Water Level Indicator with alarm
Melody generator for greeting cards

4 in 1 burglar alarm

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

Timed Burglar Alarm

Audio amplifiers, hi-fi, mixers, graphic equalizers, music circuits etc

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 Flip Flop
Ultrasonic Switch
Digital Volume Control
5 band graphic equalizer using a single IC/chip Audio Light Modulator
Bass-treble tone control circuit
Audio level meter (vumeter)
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

Fun Circuits

Electronic Scoring Game
JAM(Just A Minute) Circuit
Flashy Christmas Lights
TV remote control blocker
Generators
Simple IF Signal Generator

Home/Garden
Ultrasonic Pest Repeller
Programmable Digital Code Lock
Pot plant water tester
Lights & L.E.Ds
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

Microcontrollers based circuits

Telephone operated remote control using PIC16F84A microcontroller

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

Oscillator Circuits
Digital Volume Control
5 band graphic equalizer

Computer / PC Hardware Circuits
Simple variable frequency oscillator
Sawtooth wave generator
Control electrical appliances using PC
Simple Analog to Digital Converter
PC based Frequency Meter
7 segment rolling display using PC

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

Electronic Sensors and related circuits
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
Temperature Sensor with Digital Output

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
The Link Telephone Intercom – Every Home Should Have One!

Test & Measurement Circuits
High Resistance Voltmeter
A simple Remote control Tester
Contactless Mains Voltage Indicator
Zener Diode Tester