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 Forum index » DIY Hardware and Software
MPY634 Analog Multiplier
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ioplex



Joined: Dec 08, 2010
Posts: 9
Location: New York

PostPosted: Fri Dec 10, 2010 12:21 pm    Post subject: MPY634 Analog Multiplier Reply with quote  Mark this post and the followings unread

I got some MPY634 and I'm looking for an excuse to use it.

Is it possible to run audio through a squarer to generate 2nd harmonics? After a crude first pass it seems that this doesn't really work. For one, the input needs to be evenly centered around 0 which is just not the case with a complex waveform. Or can I employ any tricks to get interesting harmonics?

More generally, what are some good effects that I can do with a four quadrant analog multiplier?

Would this make a good compressor? Meaning rectify and hold the input to get a control voltage based on the signal power level (in integrator?). Then controlling how quickly the CV reacts to input would be the "attack" and how quickly it drops would be the "release".

Could I make a compressor with an instant attack such that it deliberately distorts the signal. Meaning at low signal amplitude (say 100mVpp) the signal is largely unmodified but as the amplitude approaches some limit (say 5Vpp) the gain becomes 1 and the signal is clipped to create a guitar overdrive effect but presumably more subtle.

Ideas and circuits are appreciated.

Mike
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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1343
Location: Telford, PA USA

PostPosted: Fri Dec 10, 2010 6:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

four quadrant analog multiplier...

Ring Modulator?
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iopop3



Joined: May 28, 2010
Posts: 95
Location: Malmö, Sweden

PostPosted: Thu Nov 10, 2011 5:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Found http://frank.harvard.edu/~paulh/misc/lorenz.htm that uses this chip.
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