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 Forum index » DIY Hardware and Software » Developers' Corner
Analog Oscillator FM Feedback
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NoizeHack



Joined: May 14, 2012
Posts: 1
Location: LA CA

PostPosted: Mon May 14, 2012 10:37 pm    Post subject: Analog Oscillator FM Feedback Reply with quote  Mark this post and the followings unread

Hi, I have been reading this forum and building schematics I have found on here for a while and this is my first post. Anyway I am trying to figure out why FM feedback with analog oscillators is acting very boring for me. All I get is a stable increase in pitch with FM feedback. I was expecting chaos and randomness, similar to the type of effects I get with FM feedback in pure data with digital oscillators. Does anyone know why analog FM feedback isn't doing this?

More info on the oscillators I have used (incase I am just using an oscillator design that doesn't work well with FM feedback.)

-single supply +9v
-I have tried this with 3 oscillator designs, the 40106 vco, Nicolas's v/hz saw vco and a vco that I made by modifying the MFOS soundlab LFO to be a VCO.
-I tried running the output of the oscillator through a buffer, an inverting buffer, and effects before sending it back to the FM input, even making an oscillator FM chain with 3 oscillators and then last going back into the first, but none of these got me anything other than the steady rise in tone.
-FM from other sources works fine on the VCOs, so I know the VCO isn't broken

Also here is a link to a pure data patch on my website that is a crazy FM feedback patch with a video example on the page, just to give an example of the behavior I was expecting and was sorely disappointed not to get.

http://noizehack.com/fm-feedback-matrix/

Thanks.
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