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This is one of the smallest and neatest FM transmitters to be presented as a construction project and it has the advantage of being availa...

The next progressive step is to add a transistor to give the electret microphone more sensitivity. The electret microphone contains a ...

Before we go to an improved design, here is an unusual circuit using a PNP (BC 557) transistor. Firstly, PNP transistors do not work as ...

Here is a circuit with a very bad layout. The circuit may work but it relies on a "Q-factor" from the coil and capa...

The following circuit is the simplest FM circuit you can get. It has no microphone but the coil is so MICROPHONIC that it will pick up n...