Found in an old English publication, this circuit applies to the 240 V network, but can be changed to lower voltages. Transistors are mostly general-purpose, admitting modern equivalents.
Depending on the output transistor used, this transmitter can provide power from 1 to 3 W. The...
The SCR sector of this circuit can be powered by high voltage AC and instead of the LEDs we can...
This passive volume compressor was found in documentation from the 1980s. It needs a good...