This 1969 Electronics World power supply has 5 V to power digital circuits and a 170 V output for Numitron indicator valves used at the time.
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...