This circuit works as both an injector and a signal follower. We found it in the May 1994 issue of Electronics Now. The Z1 headphone must be high impedance.
I can be obtained from Mouser Electronics the new TDK inducers SPM-LR series to currents from 1.3...
This circuit was obtained in a Hobbyst Handbook from 1990. The circuit can be easily assembled...
This basic oscillator with tunnel diode generates a 100 kHz signal with 1 uW output power. The...