Don't Tell Ray: A PT2399-Based Oil Can-Style Delay  [documentation]

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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Ripthorn
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Post by Ripthorn »

Hi all, this project was one that I wanted to do for a while. It's been pretty fun digging into how oil can delays work and sound. Don't Tell Ray has a front end that can get gritty and dirty, a sinusoidal LFO, modulation speeds that match the hardware, and a tone control that allows the delays to stay nice and clean or dark and mellow. I have a full rundown of how the circuit works on my page about it here: https://scientificguitarist.wixsite.com ... t-tell-ray. Here is the demo:

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Frank_NH
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Post by Frank_NH »

Excellent design - thanks for sharing! I especially like the Grit control to add some hair to the delay tone. I could see this being the only pedal I’d need for rockabilly and country.

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Post by bmxguitarsbmx »

Nice work Rip! Sounds real good

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Post by Frank_NH »

As mentioned in the other forum, I noticed some “crackle” when you turned the Grit pot in the demo. I think a 1u capacitor at the output of the first op amp should fix it without changing the tone.

I may eventually have a go with this on my breadboard. I overbought some PT2399 chips and so have bunch to use up.

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Ripthorn
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Post by Ripthorn »

Thanks, guys! Yeah, the crackle on the grit control is because the signal goes to ground instead of Vref and there is not output cap from opamp stage. Fixing either of those two would eliminate that issue.
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