Posts Tagged ‘FM Transmitter’
This is a phone bug circuit. This wireless telephone line spy circuit can be used to transmit the phone conversation to a nearby FM radio. This circuit must connected to a normal phone line. Here is the schematic diagram of the circuit:
The first transistor is turned off, if the voltage drops to less than …
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Basically, this circuit is a radio frequency (RF) oscillator that operates around 100 MHz. The audio which is picked up and amplified by the electret microphone is fed into the audio amplifier stage built around the first transistor. Output from the collector is fed into the base of the second transistor. By varying the junction …
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The FM transmitter circuit here works in the broadcast band 88 to 108MHz, and can be used to broadcast audio signals for remote listening. The output power is around -21dBm, and the circuit operates with 3V power supply. Here is the schematic diagram of the circuit:
If you want to carry out your portable sound system …
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