This circuit was obtained from the November 1989 issue of Radio Electronics magazine. The circuit is for motors up to about 1.5 A.
With a strong positive feedback (via a 10 M resistor) we can get the trigger setting for the...
The critical component of this circuit is the transformar. We found it in an 1980s documentation....
This old oscillator using germanium transistors has a high impedance headphone as inductor to...