Gain control with 741 and JFET (CB25572E)

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.

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Hand Dryer (CB18786E)
With this circuit it is possible to use a common hair dryer as a hand dryer. The circuit is timed...
Power supply for LM12 amplifier (CB26149E)
This power supply was found in the same 1990 special issue of Radio Electronics Experimenter...
Three-phase power factor controller (CB7156E)
Suggested by an Electronic Engineering, this circuit uses components of the time. Modern...