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WTPA Mods: 9V Sallen-Key LPF for WTPA!

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    • CommentAuthorstrategy
    • CommentTimeFeb 26th 2010
     
    I have been thinking about buildling this as a pedal. There is a veroboard layout for it that is pretty simple, that I haven't built yet. This is a public domain circuit by pedal hero Tim Escobedo that is a 9V version of the LPF section (no HPF/parallel bandpass, sadly...so not a "full" ms20 filter) of the Korg MS20 filter.

    What I've heard about this is that the lack of clipping diodes makes it pretty distorted on high resonance settings. Probably pretty industrial sounding. Probably very functional with the resonance brought down. Some of the people on diystompboxes.com forum build this pretty happily. I'm sure a pcb or perf layout exists, but I haven't foudn it yet.

    At 9V seems pretty convenient to run from Vcc on the WTPA. Sorry this did not come up sooner...

    Schem: http://www.jiggawoo.eclipse.co.uk/guitarhq/Circuitsnippets/snippets.html (scroll down)
    Vero layout:

    I think I'm going to eventually try this, but I'm still trouble shooting WTPA!

    - Strategy
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      CommentAuthorAltitude
    • CommentTimeFeb 28th 2010
     
    You have a source on LM13600s?

    I'm ready to drop the modular filter and go with a stomp box one instead and this looks like exactly what I am looking for
    • CommentAuthorsmrl
    • CommentTimeFeb 28th 2010
     
    Futurlec.com stocks them for $2.90, they've got a good selection of hard-to-find stuff but they take forever. Highly reccommended if you've got a month to wait.
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      CommentAuthorAltitude
    • CommentTimeFeb 28th 2010
     
    yeah, I get stuff from Futurlec all the time, first class from Thailand takes at least 10 days to Michigan.. I guess it's time to order a bunch of shit from there anyway. I may just etch some PCBs for this, looks like a decent and simple filter..
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      CommentAuthorAltitude
    • CommentTimeFeb 28th 2010 edited
     
    Ok. I am onboard for this single supply VCF dealio. How about something like this:

    http://www.diystompboxes.com/smfforum/index.php?topic=73021.0

    http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=38490

    LP/HP/BP with an envelope follower..
    • CommentAuthorstrategy
    • CommentTimeMar 1st 2010
     
    Envelope follower - fun. The Rick Holt (FrequencyCentral) projects seem bulletproof.

    smallbearelec.com has NJM13600 too. They def dont take as long as futurlec.

    P
    •  
      CommentAuthorAltitude
    • CommentTimeMar 2nd 2010
     
    Well after some reading it looks like the EF part of that design is problematic and the only one that actually worked was the OP's. No one else has successfully built one. I'll bread board up just the filter portion of the circuit and see how it works without the EF. I like the sound and the 3 filter modes would be nice.

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