This sensitive three-transistor circuit was found in Electronics Now magazine and is earphone-readable. The tuned range depends on the coil.
The simple touch of the fingers on a sensor causes this circuit to drive a motor that goes into...
This inverter with the 555 IC provides a high voltage output, but very low current. We found it in...
This circuit is from a 1991 publication. It produces a constant current controlled by the input...