RF Oscilator Basic Explnation and Circuit

This basic oscillator circuit is easy to build and the components are not critical. Most of them can be found in your junk parts box. The L1 antenna coil can be made by close winding 8-10 turns of 22 gauge insulated hookup wire around 1/4" form such as pencil.

You can experiment with the size of the coil and the number of turns to see how it affects frequency and signal output of the oscillator. And the next stage is to try changing the transistor type.

You should be able to pick up its signal with a standard fm radio receiver. The "signal in" should be coupled with a disc capacitor of about 0.1 uf to the stage in front of it.


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