This circuit is from a 1968 Electronic Design. The circuit uses transistors of the time that can be replaced with modern equivalents. More stages can be used to get higher tension.
The circuit shown is an amplifier for medium impedance headphones including bass and treble...
This is a direction of rotation control for a small motor up to about 2 A with the indicated...
This circuit generates signals from 0.01 Hz to 10 kHz, but uses unusual components today. The...