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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
MFOS VCA X4
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Skrog Productions



Joined: Jan 07, 2009
Posts: 752
Location: Scottish Borders
Audio files: 87

PostPosted: Wed Jul 20, 2011 10:43 am    Post subject: MFOS VCA X4
Subject description: Quad VCA
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Hi there.

Last module from 2005 to get the "space management" treatment Smile .

Ordered another twin VCA board from Ray a week ago & some envelopes.

Two Vca's required for bass / melody lines and the other two vca's for control of cv's.
Here's a pic of the old module and a pic of the new panel i made & a jpeg of the layout.

hope to finish this in a few weeks .

I hear PHoBos is building a Quad vca too Very Happy Very Happy Very Happy

Dave.


Old VCA from 2005.JPG
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Old VCA from 2005.JPG



MFOS Quad VCA.JPG
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MFOS   Quad VCA.JPG



Quad VCA july 2011 blue small.JPG
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Quad  VCA july 2011  blue  small.JPG



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ashleym



Joined: Aug 20, 2009
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PostPosted: Tue Jul 26, 2011 3:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Your system is still huge. Without these reductions it would have gone out of control- then again perhaps it did!!

If you dont mind me asking? I see you have some Ian Fritz modules, I was thinking of building the The DoubleDeka Ultrasonic VCO do you have any views or experience? (I know I can ask elsewhere but I am asking here because I have some level of "understanding" of what you are up to if you see what I mean??)
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Wed Jul 27, 2011 5:59 am    Post subject: Re: MFOS VCA X4
Subject description: Quad VCA
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Skrog Productions wrote:
I hear PHoBos is building a Quad vca too Very Happy Very Happy Very Happy

yep Very Happy, 2x MFOS "another Dual VCA". got the perf PCB finshed, so I only have
to wire it up. For that I need a panel design first and I'm not completely
happy with what I have so far. It looks like I need a bit more panel space, but
I see you even managed to get pots for the CV's in there on the same space. Shocked

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bubzy



Joined: Oct 27, 2010
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PostPosted: Thu Jul 28, 2011 12:47 am    Post subject: Reply with quote  Mark this post and the followings unread

nice design as always dave. Just a quick question though, those "log/lin" swiches you got, they switch the pots from log to linear? and how??
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PHOBoS



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PostPosted: Thu Jul 28, 2011 6:03 am    Post subject: Reply with quote  Mark this post and the followings unread

bubzy wrote:
..,they switch the pots from log to linear? and how??
Dave 's not here, so let me answer that. The switches toggle
the VCA between lin. and log. responce, not the pots. Wink

here and here are some nice scope shots (shroll down)

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Skrog Productions



Joined: Jan 07, 2009
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Location: Scottish Borders
Audio files: 87

PostPosted: Sat Jul 30, 2011 8:13 am    Post subject: Reply with quote  Mark this post and the followings unread

ashleym wrote:
I was thinking of building the The DoubleDeka Ultrasonic VCO do you have any views or experience???)




Hi Ashleym.

i've built the double well chaos & the 5Pulser boards from bridechamber (via Wmonk - thanks Woody ) i've not built the vco yet Smile.



PHOBoS ........

my panels are 250mm high by 100mm wide , there was just enough panel space Very Happy .



bubzy.........

Thanks Smile , yes the switch is for VCA mode select.

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Skrog Productions



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PostPosted: Sat Jul 30, 2011 8:19 am    Post subject: Reply with quote  Mark this post and the followings unread

finished the Quad VCA , sitting in the modular now contented Very Happy

I'll post a quick audio file over the weekend when i have time .

Top 2 VCA's are the 2010 version pcb and the lower 2 VCA's are the original 2005 pcb without the bias trimmers , these ones are for my "cv controlled modulations" Very Happy .

Dave.


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wmonk



Joined: Sep 15, 2008
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PostPosted: Sun Jul 31, 2011 5:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Skrog Productions wrote:
finished the Quad VCA , sitting in the modular now contented Very Happy

I'll post a quick audio file over the weekend when i have time .

Top 2 VCA's are the 2010 version pcb and the lower 2 VCA's are the original 2005 pcb without the bias trimmers , these ones are for my "cv controlled modulations" Very Happy .

Dave.

So the top ones are AC coupled?

I finished a Quad VCA too btw. Not MFOS though.

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Skrog Productions



Joined: Jan 07, 2009
Posts: 752
Location: Scottish Borders
Audio files: 87

PostPosted: Mon Aug 01, 2011 11:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Short sound test of manual trig push ADSR patched to a VCA cv input with an LFO patched to vca signal in , vca signal out to a vco cv in, the vco runs at a constant frequency until the ADSR is fired.

Dave.


MFOS vca cv modulations.mp3
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