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 power supply was found in the same 1990 special issue of Radio Electronics Experimenter...
This crystal radio or modern version of the germanium diode galena radio (of any type) was found in...
This circuit produces the sound of a motorcycle or an outboard motor. The frequency is adjusted in the...