Found in a 1968 EEE, this circuit accepts frequencies from 1 to 1000 Hz and control voltages from 0.1 to 15 V. The operational amplifier is from the era and can be replaced by modern equivalents.
This circuit was found in the September 1974 issue of Radio Electronics magazine. The circuit uses...
This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4...
This inverse transistor breakdown circuit was found in a 1967 documentation. It applies to modern...