Anyone got a schematic for a ring modulator that DIVIDES? - diyAudio
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Old 5th April 2009, 07:15 PM   #1
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Lightbulb Anyone got a schematic for a ring modulator that DIVIDES?

I want to make a ring mod that divides by the carrier signal to get low harmonics as opposed to high. I was gonna incorporate it in to an enclosure with a multiplying one so I can switch between. Cheers for any help on this
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Old 9th April 2009, 01:59 AM   #2
Bitrex is offline Bitrex  United States
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The simplest way to get an octave division effect is to first square up the incoming signal using schmitt trigger circuit, and then use a flip flop circuit to divide down down the signal. Then you could feed the output to a ring modulator - you could even put a simple PWM circuit before the ring modulator to control the pulse width of the signal going in. Instead of using one of those diode-transformer ring modulator circuits a simpler way might be to use an IC called a doubly-balanced modulator - they were originally designed to be used in radio circuits but if you feed your audio signal into one input and an oscillator signal into the other you get a great ring modulator sound. The MC1496 or LM596 are examples of this IC. I think DOD made an effects pedal called the "Gonkulator" that used a similar technique.

I'm not sure how "musical" such an effect would sound, but if you're after analog weirdness it's certainly an idea worth trying. Here are some links to get you started:

http://www.play-hookey.com/digital/f..._dividers.html

http://en.wikipedia.org/wiki/Schmitt_trigger

http://www.flashwebhost.com/tcvr/mc1496_dbm.php
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Old 11th April 2009, 06:25 PM   #3
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Woah cheers I'll get on getting my head round that I was thinking there was just some way of doing it analog and inverting the carrier signal before being put through a ring mod to make it go down cheers though
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Old 12th April 2009, 09:22 PM   #4
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if you had a way of getting some 3rd harmonic, then locking a pll running at 1/2 that giving you a VCO running 1.5 times the input frequency, then put that into the ring mod, you'd get 1/2 your input frequency out (the difference frequencies between F and 1.5F would be 0.5F and 2F) and it would probably sound a bit weird, especially if the response time of the VCO is a bit slow.
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