Bicycle Indicator
The electronic bicycle turn indicator unit described here uses low-cost components and is a good substitute to many commercially available versions. It works in...
Electronic Dice
This electronic dice has no chance of wear and tear but all the features of a wooden or plastic dice used for Ludo game.
Electronic...
Locker Guard
Protect your valuables from burglary using this simple locker guard circuit. It generates warning beeps when someone attempts to open the locked safe. The...
Bell-Cum Light Controller
This is a circuit for a bell and light controller that consists of a doorbell with porch light. When someone presses one switch, the bell rings and the light turns on for 3 minutes. Another switch turns on only the bulb for 3 minutes.
PC Table Lamp
This useful circuit is built around well-known timer IC TLC555. It activates an electric bulb when your PC is switched ‘on’. When you shut down the PC, the lamp also automatically turns ‘off.’
Seismic Sensor
This circuit detects the movements of humans or animals. Whenever it detects any movement, a buzzer starts beeping and a red LED starts to blink.
Water Tank Overflow Indicator
Water is a vital but scarce natural resource. To prevent water wastage, this water tank overflow indicator comes in handy. It gives audio as...
Mains Supply Failure Backup Light
In the event of a sudden blackout at night, this mains supply failure backup light switches on automatically to provide sufficient light for around...
Versatile Power Supply
Using this versatile power supply circuit, you can obtain the following voltages (approx.) at a current limited to one ampere: 3.3V, 5V, 6V, 9V,...
Atmel AVR ISP Dongle
Atmel’s AVR microcontroller chips are in-system programmable (ISP), i.e. these can be programmed directly in the target circuit. A special programmer software is used...