FM transmitter and Dark sensor

Posted on November 17, 2010April 24, 2020 by Sagar

A dark sensor can be converted to a simple FM transmitter using the following components. This FM transmitter is very sensitive and it has transmitting range of 30 meters.

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2 thoughts on “FM transmitter and Dark sensor”

The circuit may work but it relies on a “Q-factor” from the coil and capacitor in the tank circuit to produce a high voltage. This high voltage gives the circuit a good range. Firstly the coil and capacitor should be near each other. The coil should not have long leads. and a 22n capacitor should be across the supply to give the circuit better performance. The value of C2 is too high. It should be 10p. The coil should be 5 turns. The electret mic should not be connected directly to the base of the transistor.

what about fm receiver .you haven’t talk anything about fm receiver

Colin Mitchell says:

January 3, 2012 at 10:33 pm

The circuit may work but it relies on a “Q-factor” from the coil and capacitor in the tank circuit to produce a high voltage. This high voltage gives the circuit a good range. Firstly the coil and capacitor should be near each other. The coil should not have long leads. and a 22n capacitor should be across the supply to give the circuit better performance. The value of C2 is too high. It should be 10p. The coil should be 5 turns. The electret mic should not be connected directly to the base of the transistor.

k.supriya says:

February 27, 2014 at 1:43 pm

what about fm receiver .you haven’t talk anything about fm receiver