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Alarms and Indicator Circuit diagrams- Power supply failure alarm
- Theft preventer alarm
- Rain Alarm
- A simple electronic buzzer
- Water Level Indicator with alarm
- 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
- Charge Monitor for 12V lead acid battery.
- Wiper Speed Control
- Dome Light Dimmer for Cars
- Car anti theft wireless alarm.
- Control electrical appliances using PC
- Simple Analog to Digital Converter
- PC based Frequency Meter
- 7 segment rolling display using PC
- Electronic Scoring Game
- JAM(Just A Minute) Circuit
- Flashy Christmas Lights
- TV remote control blocker
- Light Flasher (blinking lights)
- Automatic Dual output Display
- Emergency Light
- Automatic Room Lights
- Running Message Display
- Automatic Speed Controller for fans & Coolers
- Soft Button type Motor Direction Controller
- Super simple stepper motor controller
- Discrete component motor direction controller
- Negative supply from single positive supply
- Self switching Power Supply
- Ultra low drop linear voltage regulator
- Car anti theft wireless alarm.
- Long range FM transmitter
- Remote control using VHF modules
- 40 meter Direct Conversion Receiver
- Remote control using VHF modules
- Remote control using telephone
- A simple Remote control Tester
- Clap Activated Remote
- Radio Remote Control using DTMF
- Ultrasonic switch
- Magnetic proximity sensors
- Dew sensor
- Color Sensor
- Metal Detector
- Optical toggle switch using a single Chip
- 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
- High Resistance Voltmeter
- A simple Remote control Tester
- Contactless Mains Voltage Indicator
- Zener Diode Tester