Matthew C Good : Musician, Software Engineer, Hobbyist.

PWM Pedal

I was scrounging around yesterday, looking for something I could build/make…  When I realized that with but one quick trip to Radio Shack, I could be the neato PWM guitar effect pedal that Collin Cunningham video demo’d for Make Magazine.  So I did:

PWM pedal (foreground) with a few homebuilt friends

PWM pedal (foreground) with a few homebuilt friends

Here’s the guts:

PWM Guts

PWM Guts

It’s a really cool pedal.  Way different animal than other guitar effects.  It makes sounds that most closely resemble a synthesizer.  Hope to use it for some fake-synth parts on some of my tunes in the future.  It’s kinda “glitchy” though, which I think is by design.  But every now and then the pedal does something weird, and I can’t tell if there’s something wrong with the it, or if that’s just the way the weird pedal sounds.  For instance, it doesn’t always pick up every note, and I don’t know if that’s just how it works (it *is* glitchy) or if I’ve got something loose in there.  I’ve also got some rhythmic clicking going on when the pedal is engaged but I’m not playing.  I don’t think this is umm… desired behavior, but I checked my wiring and I think it looks good.  It’s not awful, and since I mostly do recording, I can edit it out fairly easily, but it would be much more nice if it just didn’t happen in the first place.  If I figure it out, I’ll update the post.

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2 Responses

  1. kyle says:

    so….. Excuse for my lack of techy know how, but did you replace the volume pot with a switch?

  2. admin says:

    Hey Kyle, I’m the one who should be apologizing for my non-existent labels. To save space, I completely omitted the volume knob. The switch is to switch the PWM effect on or off, and the knobs are depth and rate (I think)… I hope I am remembering that right. Thanks for reading!

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