We found this circuit in an old documentation. The integrated circuits used are specific to produce effects and do not admit equivalents, being currently difficult to find.
Found in the 1991 Electronics Experimenter Handbook, this circuit detects voltage variations in...
This well-designed 4-transistor JFET audio oscillator circuit was found in the June 1969 issue of...
This filter is intended for 60 Hz noise suppression in amplifiers. We found it in American...