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 found in a Dutch documentation from 1970. The circuit makes use of semiconductors that...
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...
In the figure we have a sensor circuit that makes use of common transistors and a photo diode as...