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 Forum index » DIY Hardware and Software » YuSynth
Yusynth Modules in Euro (12 Volt) Systems
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gdavis



Joined: Feb 27, 2013
Posts: 146
Location: San Diego

PostPosted: Wed Apr 09, 2014 1:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Anyone tried the VCO yet? I haven't seen anything so I'm taking a stab at it.

U1, U2 7xL15 -> 7xL12
R50 100k -> 70k (restores "5V" reference of saw core, pretty important)
R36, R51 12k -> 7.5k (restores full range of pulse width control)
R7 270k -> 216k (restores full range of coarse control).

For R7, 216k is the ideal value but might be difficult to find. Should be OK to just get as close as you can, i.e. 215k. It's just a coarse tune anyway.

You could adjust R6 for fine tune but I don't think it's really necessary, will just be less sensitive.

If you run out of adjustment on T1, R8 could be adjusted down a little but I don't think it would be much of a problem.


I haven't fully tested it, and forgot to do R7 so I don't have the full range, but otherwise it seems to be in the ballpark. I did it to a board that's just been lying around for quite a while and it cranked right up, only needing very slight trimming to get the wave shapes back. I just did a quick and sloppy check of V/oct and it was close enough that I think it will trim up no problem.

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