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.
This circuit with a component from the time was found in the Radio Electronics magazine of...
Using two LM377s, this amplifier provides a few watts of audio in a low impedance speaker and the power...
This circuit is from 2005 documentation. It automatically starts an irrigation pump when the...