Found in a 1960s documentation, this circuit uses a transistor to drive a relay as well as a set of neon lamps with high voltage power supply.
This circuit, suggested by an old American publication, allows you to use the AM radio antenna of a...
Powering from a 36 V supply this circuit has a power output of 16 W in 4 ohm loads. With 40 V and...
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...