Found in a 1992 book, this circuit is intended for operation with audio signals. Equivalent operational amplifiers can be used. The optical coupler is an unusual type today.
This clipper or limiter circuit limits the amplitude of AM or FM audio signals. The diodes are...
This circuit was obtained in a 1960 documentation of General Electric. It is applied in the...
The transistors of this amplifier for headphones with 8 to 200-ohm impedance can be BC548 or...