Balanced modulator with jfet{40 s voltage controlled resistors

Claim 1

In a balanced modulator circuit for translating a first input signal by a second input signal to a different third signal frequency; two like first and second field effect semiconductor devices each having at least three electrode connections, first, second, and third electrodes; first input signal coupling means connected to the first electrode of said first semiconductor device; connection of the first electrode of said second semiconductor to a voltage potential reference source; second input signal coupling means connected to a primary coil of a transformer; said transformer having a tapped secondary coil with the tap connected to said voltage potential reference source, and with secondary coil opposite ends connected to, respectively, the second electrode connections of said first and second field effect semiconductor devices; with both said third electrode connections connected in common as signal output means; whErein said secondary coil opposite ends are interconnected through capacitive means; said first input signal coupling means provides an audio input path with said first input signal being an audio signal; and with the first electrode of said first semiconductor device connected through an RF coupling capacitor to said voltage potential reference source; and wherein said first and second field effect semiconductor devices are each a junction field effect transistor.