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Title: Boss OD-3 Problem
Post by: soupbone on August 22, 2011, 05:58:49 AM

I've got a Boss OD-3,and I can't figure out what frequency is causing the "Ice pick in the forehead highs" that you can't dial out.The BD-2 is the same way.Any help on this problem would be greatly appreciated!Here's the schematic;http://www.freeinfosociety.com/electronics/schemview.php?id=2299

Title: Re: Boss OD-3 Problem
Post by: ghostsauce on August 22, 2011, 09:32:07 AM

Just watched some demos on YT of the OD3 and it sounds pretty darn good. Definitely not hearing the icepick you're talking about... But, there is surely a cap or two you can tweak to lower the highs. ~~Maybe if you dig up a schematic the smart people will help you out.~~ Good luck :s

Oi... time to get that 2nd coffee. heh

Title: Re: Boss OD-3 Problem
Post by: soupbone on August 22, 2011, 05:13:51 PM

Yeah,I just don't know which cap,or caps to change.The schematic is linked on my post.Any ideas?

Title: Re: Boss OD-3 Problem
Post by: WGTP on August 22, 2011, 05:25:49 PM

Looks like lots of tone shaping around the 2 op amps before the tone control.

C16 - .012uf appears to be rolling off some highs. Try .022uf or .047uf to roll them off some more. ;)

Title: Re: Boss OD-3 Problem
Post by: soupbone on August 23, 2011, 02:55:24 AM

Quote from: WGTP on August 22, 2011, 05:25:49 PM
Looks like lots of tone shaping around the 2 op amps before the tone control.

C16 - .012uf appears to be rolling off some highs. Try .022uf or .047uf to roll them off some more. ;)

Ah ha!Excellent!!Thanks for the info!!

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DIY Stompboxes => Building your own stompbox => Topic started by: soupbone on August 22, 2011, 05:58:49 AM