This circuit was found in a 1965’s General Electric documentation. It is intended for low voltage brush motors. The SCR must be according to the engine controlled.
This relay circuit was found in a 90s American documentation. The transformer windings are...
The indicated circuit is an intermittent one in which we use two 555 integrated ones, one as a low...
Found in documentation from the 1980s, this circuit uses an operational amplifier from that time....