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EMITTER_COUPLED_BIG_LOOP_OSCILLATOR

2016-08-24 13:25  
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EMITTER_COUPLED_BIG_LOOP_OSCILLATOR
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 reso-nant detector might make a very good anti-personnel alarm. Transistors are 2N2926 or equivalent.