This circuit uses a quadruple operational amplifier of the time. The circuit is from the 70s but can be implemented with modern operators that require the use of a symmetrical source.
This circuit is ideal for recovering vinyl media with a linear response from the RIAA curve of the...
The purpose of this circuit found in the September 1977 issue of Radio Electronics magazine is to...
We found this circuit in the July 1990 issue of Radio Electronics magazine. The frequencies are...