This is the simplest circuit to get a really cool ring modulator. The AD633JN does everything for you. It is a low cost (about $5.00 to $6.00 a chip) precision multiplier. I am using it in a really simple configuration that lets you switch from multiplication to modulation. The gain is boosted a bit for multiplication so that in either mode you get approximately the same signal level out (which is completely dependent on the input signal levels). This circuit expects large signals. I am using 10V P to P signals for both the carrier and modulation inputs. If you want to use some lower signal sources I suggest that you amplify them with some op-amps to at least several volts P-P. I just put 3 of these circuits on a Radio Shack bread board and wired it to a panel.

This is perfect for bell tones and many very cool timbres. Have fun...

Analog Devices AD633JN Chip

The Simple Ring Modulator Circuit

Ring Modulator Parts List