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- PIC based Temperature Controller
- Power supply failure alarm
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- Alarms and Indicator Circuit Diagrams
- Automatic Speed Controller for fans & Coolers
- Charge Monitor for 12V lead acid battery
- Control electrical appliances using PC
- Electronic Scoring Game
- High Resistance Voltmeter
- Light Flasher
- Long range FM transmitter
- Magnetic proximity sensors
- Remote control using VHF modules
- Simple variable frequency oscillator
- Soft ON/OFF switch
- Stereo Channel Selector
- Super simple stepper motor controller
- Telephone operated remote control using PIC16F84A microcontroller
- Telephone Ringer using 556 dual timers
- Theft preventer alarm
- Ultrasonic Pest Repeller
- 40 meter Direct Conversion Receiver
- A simple Remote control Tester
- Audio amplifiers
- Automatic Dual output Display
- Dew sensor
- JAM(Just A Minute) Circuit
- Low cost intercom using transistors
- Negative Supply from single positive Supply
- Programmable Digital Code Lock
- Rain Alarm
- Remote control using telephone
- Sawtooth wave generator
- Self switching Power Supply
- Soft Button type Motor Direction Controller
- Two line intercom plus a telephone changeover switch
- Wiper Speed Control
- A simple electronic buzzer
- Cars/Motorcycles
- Color Sensor
- Contactless Mains Voltage Indicator
- Dome light dimmer for Cars
- Emergency Light
- Flashy Christmas Lights
- Infrared Head Phones
- PC based Frequency Meter
- Pot plant water tester
- Telephone line based audio muting and light on circuit
- Ultra low drop linear voltage regulator
- 7 segment rolling display using PC
- Automatic Room Lights
- Clap Activated Remote
- Computer / PC Hardware Circuits
- Computer / PC Hardware Circuits
- Discrete component motor direction controller
- Having secrecy in parallel telephones
- Metal Detector
- Over / Under Voltage Cut-Out
- TV remote control Blocker
- Use the CD-ROM drive as a audio CD player without the computer
- Water Level Indicator with alarm
- Zener Diode Tester
- Audio Visual Indicator for Telephones
- Design Ideas
- High and Low Voltage Cutout with delay and Music
- Powerful AM transmitter
- Radio Remote Control using DTMF
- Running Message Display
- Telephone call meter using calculator & COB
- Christmas Star
- FM transmitter
- Fun/Games Circuits
- High Voltage, Low Current Supply
- Melody generator for greeting cards
- Phone Broadcaster
- Ultrasonic pest repellent
- 4 in 1 Burglar Alarm
- Audio Light Modulator
- Conversation Recorder
- Signal/Sequence/Misc. Generators
- Simple Car Battery Charger
- Simple IF Signal Generator
- Ultrasonic switch
- Brakelight Flasher
- Coilless FM transmitter !
- Home/Garden related Circuits
- Light Barrier Detector
- Multipurpose Circuit for telephone
- Optical toggle switch using a single Chip
- Car anti theft wireless alarm
- Flashy Christmas Lights
- Lights & LED effects electronic circuits
- Sound Controlled Filp Flop
- Temperature Sensor with Digital Output
- Cordless phone backup
- Dancing Lights
- Fire Alarm
- Microcontrollers & embedded systems
- Ultrasonic Switch
- Alternating Flasher
- DayLight Alarm
- Digital Volume Control
- Motor control Circuits
- Motor control Circuits
- Telephone Number Display
- 5 band graphic equalizer using a single IC/chip
- Factory Siren
- Music related Circuits
- Smart Phone light
- Bass-treble tone control circuit
- Oscillator Circuits
- Police Siren
- Telephone Headgear
- Audio level meter (vumeter)
- Big Ben Sound
- Power Supply (PS) Circuit diagrams
- Telephone Line Vigilant
- Audio Visual Ringer
- Radio(RF), transmitter, receiver & wireless circuits
- Beeper
- Off line Telephone tester
- Remote Control Circuits & Projects
- Infrared beam barrier/ proximity sensor
- Robotics related Circuits
- The Link Telephone Intercom. Every Home Should Have One!
- Electronic Sensors and related circuits
- Timed Burglar Alarm
- Telephone Circuit diagrams
- Telephone Circuit diagrams
- Test & Measurement Circuits
- Video Circuits