Pressure Sensitive Alarm
Here is a low-cost, pressure sensitive alarm. The alarm uses a home-made pressure sensor, which works as a variable capacitor using two copper-clad boards...
Electronic Ignition System for Old Cars
In older carbureted cars, the contact breaker (CB) point ignition system is used to fire the spark plugs. You can convert the ignition system...
Security System Switcher
This is a circuit for a security system that can detect movement of any intruder through a transducer and activate any security device through a relay.
Digitally Controlled Precision Amplifier
This is a circuit for a precision amplifier with digital control that can provide a gain upto 100.
PC Multimedia Speaker
This is a circuit for USB compatible low cost and low power multimedia speakers for PC.
Solar Lighting System
The world cannot continue to rely for long on fossil fuels for its energy requirements. Fossil fuel reserves are limited. In addition, when burnt,...
Stabilized Power Supply for Prototyping
This stabalised power supply circuit may be directly connected to 230V AC mains to derive output voltages of 3V to 12V DC for connection to the prototyping board.
Fire Alarm
With the onset of summer, chances of fire accidents increase. Such fire accidents can be prevented if timely alarms are available. The fire alarm...
Mains Failure/Resumption Alarm
This mains indicator sounds an alarm whenever AC mains fails or resumes. It is very useful in industrial installations, cinema halls, hospitals, etc. The...
Remote Control Tester
Here is a simple remote control tester for checking the basic operations of an infrared remote control unit. It is low cost and easy...
