Employing the XR2206 IC, this circuit was found in the May 1977 issue of Radio Electronics magazine. The formula next to the diagram gives the component values as a function of frequency.
Suggested by Fairchild in a 1980s publication, this multiplier uses operational amplifiers from that...
This circuit, from a 1981 publication, can be changed to use more modern components such as the...
We find this circuit in an American publication of 1978. The integrated circuit is the CMOS 4013...