This nonlinear gain circuit was found in a 1965 Electronic Design. The configuration can be used as a basis for modern designs with equivalent transistors.
This Baxandall tone control was obtained in an Argentine publication from the 70s. The circuit uses...
This circuit is from a Poptronics, American magazine from August 2000. The circuit can be...
This circuit allows you to vary the duty cycle without changing the frequency. An interesting...