misc
Led-based running display
Here is a circuit that creates an eye-catching running display effect using LEDs. It can be used to light up borders of animations, pictures, etc, and also for short word displays. 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 >
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 >
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 >
Telephone Line In-Use Indicator
This circuit gives a visual indication of whether a telephone line is in use or not, helping two or more people sharing the line to avoid interrupting each other’s calls. More >
Transistorised Code Lock With Torch
This electronic lock for domestic use opens only when you connect the right combination of five switches. There are twelve switches in total. If you connect a wrong combination, the lock remains closed. More >
Courtesy Light with Time Delay Switch Aspect
The circuit was constructed to provide a time delay feature when switching OFF a light to give the person enough time to reach the bed before the lamp completely turns OFF. More >
Touch Controlled Capacitive Sensor Circuit
The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system. More >