When the power is cut off, this circuit keeps the flashlight on for a while, allowing it to be located. The circuit is from a Radio Electronics from September 1992.
This circuit was suggested by Philips in 1967 documentation. The circuit receives modulated light and has...
This circuit is from a 1965 Electronic Design. The transistors may be general purpose and the...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...