This circuit was obtained in a 80s RCA documentation. The circuit uses components from that time. These components can be replaced by modern equivalents.
Found in a 1980’s documentation, this circuit must have its signal applied to an amplifier stage. The...
Found in a 90s QST, this circuit uses an operational amplifier that is still common. It generates...
This simple circuit for headphones or small speakers was found in documentation from the 90s. The...