Big loop oscillator

Posted on Sep 29, 2012

L1 is a loop of 10 to 20 turns of insulated wire with a diameter anywhere between 4` to 4'. Oscillator frequency (7 to 30 MHz) shifts substantially when a person comes near or into the loop. This oscillator together with a resonant detector might make a very good anti-personnel alarm.

Big loop oscillator
Click here to download the full size of the above Circuit.

Transistors are 2N2926 or equivalent.

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