ElectronicsZone
Electronic circuits index/archive

Click here for electronic circuits homepage

All the electronic circuits and schematics on this site are arranged on one page so that it becomes easy to locate the circuit that you are looking for:

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
  

Video Circuits

• NONE YET :(