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Boss SD-1 Mod gone bad

Started by soupbone, March 29, 2015, 09:55:43 PM

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soupbone

March 29, 2015, 09:55:43 PM Last Edit: March 29, 2015, 09:59:18 PM by soupbone
I did my Boss SD-1 Mod,except this time I used a 4.7kr for R5,a 1K for R6.I also changed R17 from 100k to 10k, and i can't remember why.When I turn up the Drive,i'm getting a high pitched squeal.Also,as you turn the Drive up past noon,it sounds like a really bad fuzz.Not sure what's going on.Any suggestions?Thanks!

ubersam

#1
March 30, 2015, 08:22:27 PM
Quote from: soupbone on March 29, 2015, 09:55:43 PM
a 1K for R6.
Assuming you didn't change C3, changing R6 from 4.7K to 1K increases the max gain from 212-ish to 1000-ish. It also changed the corner frequency from 720Hz to 3.39KHz. That's what's causing the squeal and the bad fuzz. Try a 2.2K for R6, but also change C3 to 100nF.

mth5044

#2
March 30, 2015, 09:07:52 PM
A schematic would be helpful.

soupbone

#3
March 31, 2015, 01:04:27 AM
Quote from: ubersam on March 30, 2015, 08:22:27 PM
Quote from: soupbone on March 29, 2015, 09:55:43 PM
a 1K for R6.
Assuming you didn't change C3, changing R6 from 4.7K to 1K increases the max gain from 212-ish to 1000-ish. It also changed the corner frequency from 720Hz to 3.39KHz. That's what's causing the squeal and the bad fuzz. Try a 2.2K for R6, but also change C3 to 100nF.
Excellent!Thanks Uber Sam!
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