This current switch was found in a Radio Electronics from November 1957. It triggers the current determined by the electromechanical sensor, a polarized relay of the time.
Using this circuit a low current switch can be used in the control of heavy duty loads, powered...
This very simple circuit from a 1995 documentation lets you know which input button was triggered when...
An oscillator that can be frequency controlled by a resistive sensor is shown in the figure. The...