This circuit is from 1975 documentation. Transistors such as 2N3055 can be used and the transformer is of a special type. R1 is 200 ohms and R2 is 10 ohms.
This circuit prevents the accidental inversion of the input polarity of a source to cause damage to...
Found in a Radio Electronics magazine from September 1958, this circuit has an LDR powered by the...
This circuit was found in General Electric documentation from the 1980s. The circuit is intended...