Found in an American documentation from 1969, this circuit makes use of a pair of matched transistors of the time. The circuit supports modern equivalent components.
This double tone generator uses a specific integrated circuit, having been found in a 1977 CMOS...
This circuit is used to test PNP or NPN transistors giving the status indication through LEDs. The...
This dimmer for incandescent lamps was obtained from an American 1990s documentation. The circuit...