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 Post subject: 27V boost
PostPosted: Mon Apr 12, 2021 12:56 pm 
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Joined: Sat Mar 14, 2020 7:42 pm
Posts: 21
Location: Hancock, Michigan
Hey guys, I built a 27V boost for a friend about a year ago and it has worked perfectly, but recently it started making what I can only describe as a helicopter chopping-like sound when it's turned on. Bypass works fine, there's no guitar signal coming through when the pedal is engaged.
Any ideas what might be causing that?


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 Post subject: Re: 27V boost
PostPosted: Mon Apr 12, 2021 1:37 pm 
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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5639
Location: Moses Lake, WA
Probably either your power supply or the 7660 charge pump.

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*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com


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 Post subject: Re: 27V boost
PostPosted: Mon Apr 12, 2021 4:16 pm 
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Joined: Sat Mar 14, 2020 7:42 pm
Posts: 21
Location: Hancock, Michigan
byoc wrote:
Probably either your power supply or the 7660 charge pump.

So if I have to replace it, I'll need another voltage inverting charge pump, right? Like a Max1044?


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 Post subject: Re: 27V boost
PostPosted: Mon Apr 12, 2021 4:22 pm 
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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5639
Location: Moses Lake, WA
If the problem is the charge pump. Most often, it is indirectly caused by the charge pump though. They don't like to be used with DSP type effects, dying batteries, or budget power supplies.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com


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