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The following wireless microphone circuit schematic diagram is very sensitive, it can pick up every sound in 20 meters radius. It also transmits the radio signal up to 2 kilometres in open air. Therefore, you should pay attention that operating this circuit might violate your country regulation. This FM transmitter radiate strong radio frequency to [...]

Please be warned if operating this circuit might violate the regulation of your country, because this FM transmitter circuit radiate strong radio frequency to the environment. This wireless microphone is very sensitive, pick up every sound in the 20m radius, and transmit the radio signal up to 2 kilometers in open air. Here is the [...]