This circuit was found in the April 1993 Electronics Now magazine. With it, it is possible to control the gain of an operational circuit with a JFET.
We found this circuit for video games in a Radio Electronics magazine from August 1977. The...
This circuit has a low level at its output (pin 8) when the input signal has a frequency of 10...
The circuit in the figure uses the four current amplifiers of the LM3900 to generate a sawtooth signal...