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 circuit was found in a National Semiconductor manual from the 1980s. The integrated circuits used...
This circuit was found in Motorola documentation from 1968. Transistors can be modern equivalents, just...
This circuit was obtained from an English documentation, with the purpose of carrying out the...