This 1969 circuit uses a 117 V filament tube powered directly by the power grid. The original circuit makes use of a charcoal microphone, a common component at the time.
This circuit has been found in an old documentation, but can be used as input shield for current...
This amplifier with antique germanium transistors is from a 1968 publication. The circuit provides...
August 2016 - It can be obtained from Mouser Electronics new wireless 3W transmitters from RTD to...