Electronic Ludo
In this electronic version, the players need to press a push-to-on switch instead of throwing the six-surface dice. When the switch is pressed momentarily, the 7-segment digital counter displays a number immediately.
Christmas Lights Using LEDs
This is a circuit that can be used as for festive decorations. It contains eighteen LEDs that can be assembled as one's wish.
Easy Transistor Tester
Using this easy transistor tester circuit, find out whether a given transistor is good or bad before soldering it. You can also identify npn...
USB Power Booster
The USB serial bus can be configured for connecting several peripheral devices to a single PC. It is more complex than RS232, but faster...
Accurate 1Hz Signal Generator
Accurate 1Hz squarewave pulses are required in stopwatches and other digital circuits. Here is a low-cost, general-purpose 1Hz signal generator without using a crystal oscillator.
Ultrasonic Burglar Alarm
This unique ultrasonic burglar alarm makes use of the invisible, inaudible ultrasonic sound beam to detect movements. Ultrasonic transducers operate at maximum efficiency when...
Low-cost Night Lamp
This simple, low-cost night lamp automatically activates at night and deactivates in the daytime. It incorporates battery charging circuit with protection against over-charging and deep-discharge.
Current Sensor
The circuit presented here senses the flow of electricity through the appliances and generate an audible beep after every fifteen minutes to indicate the ON state of device.
Touch Based Doorbell
This touch plate doorbell makes use of enhancement-mode MOSFETs forming part of CMOS quad NAND gate CD4007B in conjunction with a detector and Darlington driver stage.
Remote Emergency Alarm for Unmanned Lifts
In unmanned lifts or elevators, sudden power failure cannot be detected from the remote operating room, and this can prove dangerous for the lift...