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 Forum index » DIY Hardware and Software » Synthasystem
VCO/VCF production run
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dingebre



Joined: Aug 10, 2008
Posts: 270
Location: Salt Lake City, UT USA
PostPosted: Mon Sep 13, 2010 1:00 pm    Post subject: VCO/VCF production run Reply with quote  Mark this post and the followings unread
I've ordered a production run of VCOs and VCFs. I'll do EGs next in a couple of weeks.

David
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David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.

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The Bad Producer



Joined: Mar 08, 2009
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PostPosted: Sun Sep 19, 2010 5:13 pm    Post subject: Reply with quote  Mark this post and the followings unread
Cool!

Just wondering what the difference between V1.1 and V1.2 of the VCF is, and which ones you ordered?
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dingebre



Joined: Aug 10, 2008
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Location: Salt Lake City, UT USA
PostPosted: Sun Sep 19, 2010 6:26 pm    Post subject: Reply with quote  Mark this post and the followings unread
The Bad Producer wrote:
Cool!

Just wondering what the difference between V1.1 and V1.2 of the VCF is, and which ones you ordered?


I ordered the V1.2 for the production run.

The V1.1 PCB had a 1.2k specified for R11 on the silkscreen. V1.2 changed R11 to 3.6k per Nyle's recommendation. 1.2k didn't give quite enough resonance with the 100k resonance pot.

The electrical connections and the compnent layout are identicle. Only the value of R11 is different.

One other difference is on the Power/Regulation PCB. Instead of a 360 ohm resistor with the 150u electrolytic, Nyle suggested using a 300 ohm to give a better range on the Frequency control.

Thanks for asking and noticing!
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David M. Ingebretsen, M.S., M.E.
Collision Forensics & Enginering, Inc.

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