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April 20, 2015, 08:56:59 PM
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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  Phase 90 not phasing 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Phase 90 not phasing  (Read 4970 times)
Posts: 177

Brian Sodergren Yooper

Phase 90 not phasing
« on: June 20, 2007, 01:23:41 PM »

Well, I was going to try and have the first pedal related post..oh well...

I've got my phase 90 up and running.  I seems to have a problem somewhere though.  The only phasing I can get out of it is when I adjust the trim pot.  It won't do it on it's own.   I had to make a couple of substitutions on my build.  First was the 5.1 zener.  The closest I had was a 6.2.  The second was the 4125, I used a 3906.  I also used J201's.   

Any ideas out there in this fresh new landscape?

Posts: 1326

Rod R. Melbourne

Re: Phase 90 not phasing
« Reply #1 on: June 20, 2007, 01:32:21 PM »

 Try a lower Zener/ test the Fets for a low voltage matched group...the trick is getting a 'em with Vgs(off) of  less that 3v.
I think the original Zeners were more like 3.3v..so yeah, I'd definitely start there.
« Last Edit: June 20, 2007, 01:59:47 PM by Toney » Logged
Posts: 177

Brian Sodergren Yooper

Re: Phase 90 not phasing
« Reply #2 on: June 20, 2007, 02:01:37 PM »

Thanks, I'll try that.  I used the 6.2V because it was the lowest one I had.  Guess I need to go find some more.....Have to build me an FET tester now too I guess. 

Thanks for the tips.

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