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> ...i cant tell if they are damaged

Never mind the pedals. It is YOU we are worried about.

Powered by what?? Another 2-pin supply?

You NEED a 3-pin somewhere. Your gear (and exposed metal on it) MUST return to wall-outlet Ground.

I worry especially about $2 thrift-shop warts, which may have way-excessive leakage due to age or abuse.

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> depth control it works fine

But "the led stays on much longer than it stays off". The Depth should modulate the LED, not the audio.
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> replacement guitar preamps for those which go bad

Don't look at it that way.

Sell an "improved!" preamp at a fair price. The "improvement" may be only hand-soldering or blue PCB stuff or some small obvious detail.

My truck wants a new engine. GM will sell me one, but all-included not cheap. Jasper or Speedway will sell me an engine with seasoned castings, shaved ports, fat manifold+carb, 100 more horsepower, for the same or less.
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Whoops - one thing I just realized with the example I gave. You'd need 0v from the PIC to create the pulse not 5v. So your pin would have to be 5v nominal the switch to ground for the pattern. So, for an indicator LED you would need to put it parallel with the LED driver instead. But, I think that will work. Sorry!
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Why not just go optical? An LDR works really well for square wave trem like this and you can get incredibly fast speeds (into ring mod territory) without thump if you do it right. Plus, you could also incorporate a depth pot for the LED driver so it doesn't have to be full on/off which can be really useful. I think it would work with 5v output from the PIC.

This setup works well. It's different than yours (inverted with gain recovery) but many people have used variations of this successfully. I drew the depth for how I think it would work for your circuit (I would add a cap in parallel with T1 which this example doesn't have)



In this case, though, LED2 on your schem might become troublesome as a noise source in parallel with the new LED driver. It might be better to up R4 (your schem) to 100k and then use a transistor to turn the output led2 on and off. Honestly, not sure.
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Thanks for the advice guys.  With you advice, I am pretty confident that the main issue is indeed the op amp.  I will send an update when the parts come in and it get it replaced.  I will probably have to replace the speed pot also but I'd to get the oscillation working first.  Thanks!
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I second what reddeserrt said.

Circuits can be protected by patents, although most aren't, and PCB designs can be protected by copyright.

If you redraw the schematic and lay out your own board it's legal to clone anything that isn't patented. That's why there so much of it about.

So long as you don't try and pass it off as something that it isn't and don't infringe anyone's trademark protection of their name, logos, or design, then it's fine. For a PCB which no-one sees, most of those last things won't apply.

Tom
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you hold down the "Record" button and then tap a pattern of On's and Off's on the Bypass switch. Once you release the record button, that's your pattern.
Is this a two feet operation?  I would get hurt trying that!  :icon_eek: :icon_wink:

I dunno. I haven't decided. It'd be possible to use momentary buttons, in which case, you'd just set up a pattern with a couple of fingers.But you could use momentary foot switches for both too, in which case you could put a new pattern in standing up, assuming you can balance on your heels a little bit.

<edit>My stripboard prototype for code development has little push buttons, but I was thinking footswtiches for a stage version. Maybe arcade buttons would be nice?</edit>

T.
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Building your own stompbox / Re: Jenny Greenteeth: LFO won't wobble
« Last post by KarenColumbo on Today at 05:04:05 PM »
The way it worked (for some hours) on my breadboard, there was nothing weird to it - well, I "tamed" the intensity a bit, but it was shimmering, throaty, everything MY chorus should be. Perfect for those Joni Mitchell chords, lots of 9th and 11th in them :) Only thing that I didn't like was a bit of "pulsing" -> triangle LFO. If I EVER be able to reproduce it I'll try those waveforms :) Looking forward to receiving those multi-legged beasties :)
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