PCB Layout Problem aka A Boost That Doesn't. HELP!!11!

Started by railhead, August 17, 2007, 06:34:47 PM

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railhead

Still working on making a really small, custom AMZ Boost PCB -- and I would have bet money I had it figured out -- but when I engage the pedal, minimum volume equals silence (which it should), but maximum volume equals unity. I swapped out the J201s and I get the same result, so the only thing I'm left with, is assuming I screwed-up my new PCB layout. Here's my arrangement (looking down at the component side):



Here's a list of voltages:

Q1
D: 9.25
S: 5.36
G: 4.44

Q2:
D: 5.37
S: .650
G: .2

I don't understand why Q2 isn't getting much juice, but that's because, admittedly, I don't know a whole lot about this stuff. :)

What else do I need to check? Did I screw up this PCB layout somewhere? Here's a link to the schematic file. All my solder joints are good, I'm not getting any shorting between traces, etc.

This thing has been totally kicking my butt for DAYS...

:(

railhead


mars_bringer_of_war

Be sure the jfets are oriented properly. That would be an easy mistake, and looking at the layout, that may be the problem. Try flipping them.
I will quietly resist.