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 Forum index » DIY Hardware and Software » Jürgen Haible designs
vchadsr troubleshooting
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jimsmiley



Joined: Sep 18, 2011
Posts: 2
Location: melbourne

PostPosted: Mon Oct 28, 2013 4:52 am    Post subject: vchadsr troubleshooting Reply with quote  Mark this post and the followings unread

Hey all. Just trying to wrap my head around the vchadsr at the moment. (http://www.jhaible.com/jh_vc_hadsr.pdf) I have two semi-working homebrew boards, both identical, behaving the same. Attack and Release both work beautifully, however, I can't get the decay stage to do anything, and sustain just raises or lowers the overall voltages of everything.
I cheated somewhat, using 741's as u7B, and u6a, and lf412 as u8/u9

D2 looks as though it is meant to pull high after a certain threshold, turning q6 on, , however, it seems like q6 is always on no matter what, , pulling r6,r7 low, never allowing q5 to short r9. There's the briefest of pulses on the base of q5 when triggered.

Any ideas as to what I should be seeing in this area?
Cheers, Jim
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jimsmiley



Joined: Sep 18, 2011
Posts: 2
Location: melbourne

PostPosted: Tue Oct 29, 2013 5:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Fixed - changed the 1N cap to 100N, and all working great so far, in my quick tests. Time to finalise a layout and build a few for a polysynth project - appears to be a really great design for such a thing with the level of fine tuning available.
The hold function's been disabled by omitting all parts, except for 18k to negative. Have to add some sort of gain control for my filter contour also
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