This circuit featuring a new quadruple operational amplifier was found in the March 1980 issue of Radio Electronics magazine. The circuit is to be powered by a symmetrical 15 V source.
This oscillator was found in the November 1986 issue of Radio Electronics magazine. The frequency...
This sophisticated circuit with a low, medium, and high treble filter is from 1990 documentation. The...
This circuit was obtained from a 1998s Popular Electronics. The magazine no longer exists, but the...