Thread: bias adjustment for a boss dm-3
Forum: DIY Guitar Effects
Author: rockbottom
rockbottom - 3/1/2008 at 21:31

Has anyone tried to adjust the bias adjustment on a boss dm-3. I have 2 of these pedals and one is great sounding, the other is flat and weak. I'd like to try to adlust the bias on the pedal(there is three) Can i take the values from the one pedal and apply to the weak one? If so, where do I hook my meter up?


brian - 3/1/2008 at 23:12

There should be 3 legs on each trim pot. you will have to take the pedal apart then flip the board over. Your speaking about the clock speed. You really need a oscilloscope, but if you listen closely you might hear some clock noise in the delay. Adjust until it's not audible


rockbottom - 3/2/2008 at 00:21

The problem with the delay is that it's not as clear as my other dm-3. It just sounds tired.


Guitar101 - 3/2/2008 at 00:25

Umm let's start simple.. Are you using a battery?


rockbottom - 3/2/2008 at 00:33

Yes . battery is brand new.


Guitar101 - 3/2/2008 at 00:40

A thing to note is that just because all the parts are identical doesn't mean every pedal will sound the same. Try the clock speed thing brian suggested and see if that helps.


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