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DLS troubleshoot

Started by THOMMO, April 12, 2013, 03:31:27 AM

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THOMMO

Hey guys, just finished this board http://4.bp.blogspot.com/-uRdgxZeYXjM/T5530pg1G3I/AAAAAAAABZQ/83CBW8T7Sfw/s1600/Catalinbread+DLS.png
and started testing it(as I always do) and got nothing. I did a bit of probing and it seems I'm getting no sound beyond Q1's gate. I'm using J201's and subbed a 3.3uf for the 2.2uf electro and a 3.3n for the 3n cap, as I didn't have the exact values. I've checked everything as much as I could before posting, scored like a madman between tracks, found a couple of silly mistakes, fixed them and the result remains the same. Here are the voltages I'm getting:   Battery: 9.35v

Q1 D 0.78
     S 0.70
     G 0.00

Q2 D 8.48
     S 0.78
     G 1.39

Q3 D 8.48
     S 0.00
     G 0.78

Q4 G 0.00
     S 0.00
     D 4.30

Q5 G 4.04
     S 4.30
     D 8.44

Q6 G 4.29
     S 4.35
     D 8.44

Cheers for any help. I really want to get this one working.

Jason.
May The Twang Be With You

gjcamann


THOMMO

I would think so, I got them from Tayda. Besides I finished a Plexi-Drive before this one and it worked great! Well, I did have to bias them manually in the end. Do you think that could be the problem?
May The Twang Be With You

THOMMO

Got it working!!! I left it, came back three different times and found something I'd done wrong each time....lol.  :icon_rolleyes:
The problem was a ground connection that shouldn't have been there. I also found that I had my 102 and 101 caps switched in my parts drawers  :icon_redface: I did laugh at myself when I found that one!!

J201's are sweet, great sounding circuit!!

Cheers, Jason.
May The Twang Be With You