The idea of this circuit is that when the device in SO1 is turned on, the device connected to SO2 automatically receives power. The circuit is from Radio Electronics from January 1985.
Found in a 90s 303 Circuits, this circuit uses the KTY10 sensor, widely used at the time. | Clique na...
We found this circuit in the Linear Applications Handbook of the 1994 National Semiconductor. The...
In the figure we have the commercial circuit of a Japanese electronic voltmeter from the 60's. The...