Found in an English publication from the 1980s, this circuit can be built with equivalent transistors such as the BC549. The signal must be applied to an external amplifier.
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...