This is the typical audio amplifier for a 1967 television. We found it in a magazine from the time. Note the use of the output transformer and the high supply voltage. The circuit is an RCA CTC21.
This digital instrument input circuit was found in the September 1989 issue of Radio Electronics...
Shunt-type regulators are connected in parallel with the load by diverting the current to behave as a...
This useful instrument has dual function, operating both as signal injector and continuity tester. The...