Theres a fuzziness in the peaks of the envelope. Mine is the older reissue from 1996.
I was reading that this might be a common issue with these but has anyone out there heard of a fix?
Thanks!
DOD 440 issue
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The DIY forum is for personal projects (things that are not for sale, not in production), info sharing, peer to peer assistance. No backdoor spamming (DIY posts that are actually advertisements for your business). No clones of in-production pedals. If you have concerns or questions, feel free to PM admin. Thanks so much!
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solewheelin
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DOD 440 issue
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eatyourguitar
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Re: DOD 440 issue
http://www.freeinfosociety.com/electron ... dod440.jpg
I have no experience in this but I think it is a volume issue and also a filter Q being too narrow. I would start by managing the volume by adding a pot and a trimmer. that way you don't change the sound of the pedal at all. I would put a 100KA attenuator pot before the 10nf input cap. after the 10nf input cap I would change 10k to 1K. then I would modify the gain of inverting opamp that handles the output volume and the active filter network. the 430K negative feedback resistor can be changed to a 220K resistor in series with a 500K trimmer. that should sort you out without actually decreasing the resonance of the filter.
if you don't add an input trimmer 100K or pre gain pot, then don't decrease the 10K to 1K. without the 100K trimmer you would probably do better to increase 10K to 33K.
I have no experience in this but I think it is a volume issue and also a filter Q being too narrow. I would start by managing the volume by adding a pot and a trimmer. that way you don't change the sound of the pedal at all. I would put a 100KA attenuator pot before the 10nf input cap. after the 10nf input cap I would change 10k to 1K. then I would modify the gain of inverting opamp that handles the output volume and the active filter network. the 430K negative feedback resistor can be changed to a 220K resistor in series with a 500K trimmer. that should sort you out without actually decreasing the resonance of the filter.
if you don't add an input trimmer 100K or pre gain pot, then don't decrease the 10K to 1K. without the 100K trimmer you would probably do better to increase 10K to 33K.
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solewheelin
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Re: DOD 440 issue
Thanks. Just seeing this now..
I was hoping I could go a shorter route and test/ swap/ add the correct resistor to cap to remedy the issue.
Is there at least a shot at that? Trying to understand. I didn't want to add a trimmer unless it was crucial that I do so. I really appreciate your help.
I was hoping I could go a shorter route and test/ swap/ add the correct resistor to cap to remedy the issue.
Is there at least a shot at that? Trying to understand. I didn't want to add a trimmer unless it was crucial that I do so. I really appreciate your help.
Great deals (here) with - Skip (x2), Brochacho, TheInk'd, rfurtkamp, phantasmagorovich, foomanfat, Helter, hbombgraphics (x3), buyyerown, deucejanisch, jrmy, HotRats, Chuckjaywalk, uberdave, alexsga, ianmarks (Turnipfarm FX), RainbowsAreFree, tsirotinsky, JustinM1789m, zrobertez, jrh60, Casavettes, John, tashiattack, symbolique, aen, chrisdermo, fldrvr, controlFreak
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eatyourguitar
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Re: DOD 440 issue
no trimmer eh? how many times do you want to desolder the same resistor? you need to increase the resistance at the input. change the 10K resistor to something bigger like 27K 33k 47k. also I want to reiterate that this will probably fix it only if it is a volume issue that can be fixed that way. I can estimate but you need to verify that this will actually work. I take no responsibility for any damage or unwanted affect.
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Bartimaeus
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Re: DOD 440 issue
One way to make that experimentation easier could be to socket the resistor. Just cut up one of these.
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solewheelin
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Re: DOD 440 issue
I was thinking that I could just use alligator clips to test resistors but i'd definitely rather install a socket. Thanks. Good idea.
I'm making a small bear order next week. Hopefully they carry these.
Thanks guys
I'm making a small bear order next week. Hopefully they carry these.
Thanks guys
Great deals (here) with - Skip (x2), Brochacho, TheInk'd, rfurtkamp, phantasmagorovich, foomanfat, Helter, hbombgraphics (x3), buyyerown, deucejanisch, jrmy, HotRats, Chuckjaywalk, uberdave, alexsga, ianmarks (Turnipfarm FX), RainbowsAreFree, tsirotinsky, JustinM1789m, zrobertez, jrh60, Casavettes, John, tashiattack, symbolique, aen, chrisdermo, fldrvr, controlFreak