This stage for JFETs was found in a 1965 US publication, but is valid for modern components.
This basic tone control circuit employs a Philips NE5538 operational amplifier, but can be adapted to work...
The integrated circuit of this 80's project is not common today. This is the HA2530 which must be...
This circuit was found in a British documentation from 1969. It can be implemented with modern...