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.
Found in a 90s nHands On Electronics, this circuit triggers a relay that shuts off the load when...
We found this circuit in an American 1980s documentation. The operational ones used are not common...
Found in a Popular Electronics from the 90s, this shield is activated by a 20 mA current. The...