We found this circuit in a Radio Electronics from the 90s. Transistors admit current equivalents, especially the power one that is not a common type today.
This experimental TTL circuit is from 1992 documentation. It produces programmed sounds set in the...
This Audio System circuit was found in 1965 documentation. It is a 50 ohm line circuit with 22 dB...
This timing circuit was found in old documentation. The technology is CMOS. The supply can be made...