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Apache Ring Modulator

Aaron Cram's Apache Ring Modulator

Courtesy/Thanks to: Aaron Cram

Description: A ring modulator. Also known as a “four quadrant multiplier.” Send any two signals into the two inputs, and you'll hopefully get something interesting and very different at the output.

Engineering notes: built using National's LM13700 datasheet as a reference. I added some op-amp buffers and ditched the Darlington. I also noticed that the gain of the amp seemed lopsided, so I tweaked some resistor values until it looked symmetrical on the ‘scope.

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Files
aaroncram_ringmod_001.jpg
   Picture of a breadboard mounted Apache Ring Modulator
aaron_cram_ringmod.gif
   Schematics for the Apache Ring Modulator
Parts used
LM13700
   Dual Operational Transconductance Amplifier with Linearizing Diodes and Buffers