Using transistors at the time, this circuit was found in a 1970s documentation. Transistors support modern equivalents for 2A currents at least in the case of the output transistors.
This experimental telegraphic communication system can have wires connecting to the handset of...
Scratch is the scratching noise that occurs mainly with old records. This high frequency noise is...
This short-range circuit can act as a wireless microphone. We got the schematic and the printed...