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 Forum index » DIY Hardware and Software
Vactrol based VC-PANNER
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funkyfarm



Joined: Jan 21, 2007
Posts: 583
Location: France
Audio files: 3
PostPosted: Fri Jul 31, 2009 4:00 pm    Post subject: Reply with quote  Mark this post and the followings unread
vexed because i had to do it on veroboard...dual pan...dual crossfade...inverter/reversible pots on some cv...comparator mode implemented on all...mixers that mix PAN 1 L with PAN 2 L, that mix PAN 1 R with PAN 2 R, that mix XFADE 1 out with XFADE 2 out, and all, and all.

however i find it to be very clean, noise-wise.

This is a wonderful module.
i repeat it gave my system his (new...) name : The Stereo Hero system. Very Happy
(until i'll go 5.1...)

I don't clearly remember but I guess i only use it on audio signal, don't know why... (there's some DC caps on inputs ? maybe not ?)
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC
PostPosted: Tue Sep 01, 2009 3:26 pm    Post subject: Re: Green / Red / Green / Red !!! Reply with quote  Mark this post and the followings unread
vtl5c3 wrote:

Is the inverting buffer at the input really necessary? I'm looking at the original Buchla 207 schematic and don't see any. I think the 1K resistor at the input is there to limit the input current.


Romeo,

Do you still have the 207 schematic? I'd really like to lay out a PCB for the 207, but I can't find the schematic anywhere. Would you mind sharing yours?

I was thinking I'd make some kind of hybrid of the 206 and this Verbos Vactrol Panner-- but the 207 is really what I'm after.

Chris
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boosimas johnson



Joined: Nov 15, 2008
Posts: 13
Location: arizona
PostPosted: Tue Sep 01, 2009 3:57 pm    Post subject: Reply with quote  Mark this post and the followings unread
http://www.synthfool.com/docs/Buchla/
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC
PostPosted: Tue Sep 01, 2009 5:50 pm    Post subject: Reply with quote  Mark this post and the followings unread
boosimas johnson wrote:
http://www.synthfool.com/docs/Buchla/


WOW... thanks boo! I've never seen this directory before. I appreciate the link.
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numbertalk



Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
PostPosted: Tue Sep 01, 2009 6:11 pm    Post subject: Reply with quote  Mark this post and the followings unread
He apparently just put these files up. Pretty awesome.

ericcoleridge wrote:
boosimas johnson wrote:
http://www.synthfool.com/docs/Buchla/


WOW... thanks boo! I've never seen this directory before. I appreciate the link.
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intellijel



Joined: Sep 10, 2006
Posts: 67
Location: Vancouver, BC
PostPosted: Sat Jul 10, 2010 8:56 pm    Post subject: Re: Vactrol based VC-PANNER
Subject description: Mark Verbos design chekout		 Reply with quote  Mark this post and the followings unread
funkyfarm wrote:
Can anyone confirm that there must be a mistake in the voltage control stage of this design, found at Mark Verbos' ?

http://www.simple-answer.com/DIY.html

PANNER :

Posted Image, might have been reduced in size. Click Image to view fullscreen.



I have been looking at this circuit and trying to figure it out (mainly with respect to the vactrol controls and how the panning is derived).

Afaik the two transistors formed a differential amplifier but there are no resistors on the collectors for dividing voltage. (there are the diodes instead)
Also how come in this design the two emitters are linked by a single resistor?
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