CAR-REVERSING HORN WITH FLASHER
Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. More >
dual line phone
This simple circuit of a duophone allows you to access two telephone lines through one telephone set. Each telephone conversation will remain entirely separate unless you choose to combine the two lines through a conference switch. More >
Invisible Broken Wire Detector
Portable loads such as video cameras, halogen flood lights, electrical irons, hand drillers, grinders, and cutters are powered by connecting long 2- or 3-core cables to the mains plug. More >
Remote Control for Toy Car
Make any battery-operated toy car remote-controlled using this circuit. The circuit, consisting of an infrared transmitter-receiver pair, uses IR beam transmission to switch the toy car ‘on’ or ‘off.’ To operate the toy car, More >
Laser Communication System
This laser communication system transmits sound or music signals through a laser beam. The intensity of the laser beam changes with the amplitude of the sound signal. The variation in the intensity of the laser beam is converted into a variation in the voltage level by using a calculator’s solar panel. More >
CCFL Tester for LCD Screens
Liquid crystal displays (LCDs) are used in a wide range of products including flat-screen computer monitors, laptop computers,tablet PCs, PDAs, digital cameras and portable instruments. More >
Home Appliance Control Using TV Remote
This circuit is designed to switch on/off any home or industrial appliance by using the TV/DVD remote controller. The circuit can be operated up to a distance of 5-10 metre depending on the remote used. More >
Wireless switch
Normally, home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting.
Mobile Phone Battery Charger
Mobile phone chargers available in the market are quite expensive. The circuit presented here comes as a low-cost alternative to charge mobile telephones/battery packs with a rating of 7.2 volts, More >
Weekly Reminder
This circuit reminds you of all the important tasks that are due on a specific day every week. So be it returning your library book, switching on your favourite TV programme, putting the dustbin out or cleaning the car, it automatically flashes an LED that very day to alert you of something to be done. The LED keeps flashing until you press the reset button. More >