We found this circuit in the May 1989 Radio Electronics magazine. The circuit can have its values changed to operate at other frequencies and the power supply must be symmetrical.
In fact, this circuit can generate 50 Hz or 60 Hz signals depending on the power supply. The input...
Found in a 90s Popular Electronics, this circuit provides a current of 3 to 5 A depending on the...
Equivalent operational amplifiers can be used in this circuit suggested by Motorola in its 1990...