Print Page - Trouble with Fatpants High pitch whine

Title: Trouble with Fatpants High pitch whine
Post by: sgmezei on March 17, 2011, 05:30:04 PM

Alright so I built the fatpants and it sounds great (thanks Brian) but when it is turned on there is very high pitched whine coming through the amp. I have tried multiple amps, battery and plug power with no difference. I compared it with the SHO, LB2, and stratoblaster and haven't had any of the same trouble.

Does anyone know if this is a grounding issue or is it typical of a certain type of part (the IC, or caps).

Let me know your ideas, Thanks Team.

Scott

Title: Re: Trouble with Fatpants High pitch whine
Post by: jkokura on March 17, 2011, 05:43:56 PM

It's an IC problem. Try changing your charge pump. You probably have a CPA ic when you need an scpa.

Jacob

Title: Re: Trouble with Fatpants High pitch whine
Post by: sgmezei on March 22, 2011, 08:32:19 PM

I think it was just a bad IC. I replaced it with one of the same and it went away......I'm happy ;D

Title: Re: Trouble with Fatpants High pitch whine
Post by: bigmufffuzzwizz on March 23, 2011, 03:16:59 AM

What an easy solution. I believe i ordered one of those CPA chips which means i'll have to order a correct one.

Title: Re: Trouble with Fatpants High pitch whine
Post by: sgmezei on March 23, 2011, 07:27:12 AM

Actually I tried both and they worked fine. It was just the original that gave me a high pitched whine. So as far as I know the scpa and cpa should both work.

madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: sgmezei on March 17, 2011, 05:30:04 PM