This circuit was found in a 90s Popular Electronics. With it, using a 4066, it is possible to control between 1 to 100 the gain of an operational amplifier like the 741.
Found in an American documentation from the 90's, this circuit aims to light a neon lamp with...
This transistor circuit consists of a well-known bass and treble control configuration. The...
This circuit was found in the September 1997 issue of Electronics Now magazine. The circuit uses...