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.
Found in an Electronic Design from the 80's, this circuit monitors the charge of a 12 V battery....
Found in an EEE from 1970, this circuit supplies a voltage of 12 V DC x 10 mA current from the...
Using old germanium transistors like the CK722, this circuit has good gain. We found it in a...