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The filters to APC+Seq8
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Denis_Veselov



Joined: Nov 22, 2012
Posts: 13
Location: Russia

PostPosted: Tue Dec 18, 2012 5:45 am    Post subject: The filters to APC+Seq8
Subject description: What filters are interesting?
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Hi, guys!
I want to add any interesting and simple filter to my atari punk console w\sequencer. Anybody can recommend a circuits? Thanks.

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comrade_zero



Joined: Mar 05, 2009
Posts: 49
Location: arizona
Audio files: 4

PostPosted: Wed Dec 19, 2012 2:12 am    Post subject: Reply with quote  Mark this post and the followings unread

If you want something to work on a single 9volt supply (as I assume you have for your APC) the most common response would probably be to lift the filter section from the MFOS Weird Sound Generator. Eric Archer's website has a schematic for a more robust filter on a single supply based on the lm13700 dula OTA. You can also build a nifty one op-amp Sallen-Key filter with a single supply. Another possible option would be a state-variable filter based on a cd4069 cmos chip. If you dig around a little on this site, especially in the Lunetta sub-forum, there are some great threads on simple, low-parts, resonant filters that you could adapt and use. Feel free to reply if you need more information. Good luck, and I hope this helps.
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