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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Injector and Continuity Tester (CB4452E)
This useful instrument has dual function, operating both as signal injector and continuity tester. The...
Constant Current Source (CB13073E)
Constant current sources are used in applications such as battery chargers, electrolytic tanks, etc....
Wien Bridge Oscillator (CB9053E)
This circuit was found in old documentation, appearing elsewhere in this section, taken from other...