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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Ultimate VCO tracking and stability
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kvitekp



Joined: Feb 24, 2012
Posts: 22
Location: Santa Clara, CA

PostPosted: Fri Aug 03, 2012 1:36 pm    Post subject: Ultimate VCO tracking and stability Reply with quote  Mark this post and the followings unread

I was struggling with Ultimate VCO tracking and stability for quite some time and achieved more or less acceptable results with temperature compensated SSM2210 and matched transistor pairs.

Tried different SSM2210 from different sources, including Ray's shop, however they were not better than hand matched transistor pairs. In fact, many of SSM2210 were worse, the currently available stock seems to be very inconsistent.

Recently I got a few LM394 parts (NOS from ebay) and they make a huge difference: excellent tracking over 7 octaves is achieved with quickly converging Ray's VCO tuning procedure, it appears to have much better temperature stability with the standard tempco setup, and it looks much more stable on the scope.

Replacing SSM2210 with LM394 in my Soundlab Ultimate had similar effect -- easy straightforward VCO tuning procedure and rock solid tracking afterwards.
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Feifer



Joined: May 16, 2012
Posts: 46
Location: San Diego

PostPosted: Sun Aug 12, 2012 6:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, I'm using those LM394s too. It seems to be really stable along with a tempco. I found a bag of 6 of them in the old can package from my local liquidator shop for $1.50 recently and they've been working great. Smile
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