This basic 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 to 19 turns of 22 gauge insulated hookup wire around a ¼ inch fro such as a pencil. You can experiment with the size of the coil and the number ofof turns to see how it effects the frequency and signal output of the oscillator. You should be able to pick up its signal with a standard FM radio receiver. The “Signal” should be coupled by disc capasitor of about 0.1µF to the stage in front of it.
By. “antoon
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