Found in the 1990 special issue of Radio Electronics Experimenter magazine, this circuit uses an automobile ignition coil. Adjustments can be made to suit the coil.
This amplifier, from Motorola's Linear Interface ICs of 1993, is indicated for the excitation of...
The circuit presented shows how to use a diode in temperature compensation of a push-pull output...
With this name, we found this electronic stethoscope with a coal microphone in a 1957 Raytheon...