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.
More and more supercapacitors are being used as supplementary sources of energy in several...
This 1995 circuit directly controls a triac. The triac, in turn, controls the external load. Times...
This traditional circuit was obtained in a 1974 documentation, but can be mounted today with the...