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Car Interior Light Fader Circuit

The post explains a simple circuit which can be used for producing a slow fading light effect each time it's switched OFF. The application can be typically used in car interior lights.

6V to 220V Boost UPS Circuit for Satellite TV Modems

The post explains a simple boost converter UPS circuit for supplying an uninterruptible power to satellite TV set top boxes so that the offline recording is never allowed to fail during power outages. The idea was requested by Mr. Aniruddha Mukherji. 

Cellphone Jammer Circuit Explored

This is a RF jammer designed for the U.S. 800 MHz cellular phone band (870-895 MHz). This works by generating an overwhelming sweeping RF carrier on the cell phone handset's operating frequency range.

Voltage Stabilized Transformerless Power Supply Circuit

The post explains how an ordinary capacitive power supply may be transformed into a surge free voltage stabilized or variable voltage transformerless power supply applicable for almost all standard electronic loads and circuits. The idea was requested by Mr. Chandan Maity.

Power Interruption Alarm Circuit

This power interruption alarm circuit will alert you whenever there's a power failure or an interruption in the mains. In some special conditions it becomes imperative to know whether the mains that powers some important system or circuit is absent.