Wireless FM Microphone

This is a battery operated Wireless FM Transmitter that can transmit the audio signal up to a range of 100 feet of any spot frequency within the FM band. The transmitter could be assembled on a small Printed Circuit Board approximately at size of 35mm X 45mm. The field strength of the radiated signal will not exceed 50μV / meter at a distance of 15 meters from the unit.

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Time Dependent Lamp Dimmer

It is a completer solid state time dependent light dimmer that can be used with a 230V lamp load up to 150 Watts. This dimmer can be used in bedroom, theatre hall, or any auditorium to avoid the blinking of the eyes which occurs when bright lights are suddenly switched on.

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Electronic Circuits – Simplified