Alarms and Indicators

• Simple Door Alarm Circuit
• 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

Audio

• Stereo Channel Selector
• Low cost intercom using transistors
• Infrared Head Phones
• Use the CD-ROM drive as a audio CD p
• Audio Visual Indicator for Telephone
• Sound Controlled Filp Flop
• Ultrasonic Switch
• Digital Volume Control

Cars/Motorcycles

• Charge Monitor for 12V lead acid bat
• Wiper Speed Control
• Dome Light Dimmer for Cars

Computers

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

Fun/Games Circuits

• Electronic Scoring Game
• JAM(Just A Minute) Circuit
• Flashy Christmas Lights
• TV remote control blocker
• CIRCUIT SYMBOLS
• Audio preamp circuits

Generators

• Simple IF Signal Generator

Home/Garden

• Ultrasonic Pest Repeller
• Programmable Digital Code Lock
• Pot plant water tester

Lights & L.E.Ds

• Light Flasher
• Automatic Dual output Display
• Emergency Light
• Automatic Room Lights
• Running Message Display
• Christmas Star
• Optical toggle switch using a single
• Dancing Lights

Microcontrollers

• Digital Electronic Lock

Motor

• Automatic Speed Controller for fans
• Soft Button type Motor Direction Con
• Super simple stepper motor controlle
• Discrete component motor direction c

Oscillators

• Simple variable frequency oscillator
• Sawtooth wave generator

Music

• 5 band graphic equalizer

Power Supplies

• Uninterruptible Alarm Power Supply
• Negative supply from single positive
• Self switching Power Supply
• Ultra low drop linear voltage regula
• Over / Under Voltage Cut-Out
• High and Low Voltage Cutout with del
• High Voltage, Low Current Supply
• A simple Car Battery Charger

Radio

• Long range FM transmitter
• Remote control using VHF modules
• Remote control using VHF modules
• 40 meter Direct Conversion Receiver
• Powerful AM transmitter
• Radio Remote Control using DTMF
• FM transmitter
• Coilless FM transmitter

Test/Measurement

• Contactless Mains Voltage Indicator
• High Resistance Voltmeter

Remote_Controls

• Remote control using telephone
• A simple Remote control Tester
• Clap Activated Remote
• Wireless Doorbell

Robotics

• Magnetic proximity sensors
• Color Sensor