We find this circuit in a 1980s Linear Technology documentation. The circuit can be implemented on the basis of more modern equivalent components.
This circuit was found in a 1965 Electronic Design. Transistor Q2 must be load dependent. The circuit...
Found in RCA documentation from the 90s, this bass and treble control uses an operational...
This circuit was obtained from a Philips documentation from 1970. It can be built on modern...