This high-powered battery powered flasher was found in General Electric documentation from the 1980s. The circuit can control loads up to 3 A and has a sensor that triggers it in the absence of light.
The circuit illustrated in Figure allows external loads (8) to be driven from parallel port...
This circuit uses two transistors to simulate the action of an SCR on a regenerative switch....
The filter presented is from 1994 but can be implemented with a more modern equivalent. We found...