This 600 W reducer uses SCRs and a switching system. The circuit is from Motorola's 1975 documentation. Equivalent components can be tested for other powers.
This circuit was originally recommended to operate with the emitter of the previous circuit but...
When the probes of this circuit meet water, the relay closes its contacts. The circuit is from a May...
The power supply shown can supply voltages of approximately 0 V to 12 V with a maximum current of 4.5 A,...