Modified:11:20, 25 January 2009
CIRCUIT DESCRIPTION

This is a modified version of a really simple Ring Modulator. It works very similar to a multiplier circuit in that the output will be the product of the two input SigA and SigB.
The Op-amp is wired as an inverting amplifier in order to buffer the signal and provide some gain.
SIMULATION

The red trace shows the output of the following signals:

SigA:
40Hz sine @1v p-p (blue)

SigB:
500Hz sine @1v p-p
DOWNLOADS
Although this seems to work well in simulation, I have yet to try it out. The transformers I have purchased are shown left and are PCB mount Audio Isolation transformer with 1:1 ratio and split windings. These are available from Rapid Electronics but are not cheap!

- Circuit diagram
 - Circuit simulation

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