[sdiy] Moog filter

[Tim Parkhurst]

Hi Luis,

Here's one transistor matching circuit and some instructions.

http://www.oldcrows.net/~patchell/matcher/matcher.html

Scott Bernardi used to have a nice circuit on his site, but I can't find it
anymore. I have it stored on my computer, so I can send it to you privately
if you'd like. Scott, do you still have this stuff on your site somewhere?

I also have another really nice and simple circuit with a good explanation
that I can send to you if you'd like. Basically, you are trying to match the
Vbe of the transistors. This last schematic came from a site with a bunch of
nice schematics that I can't find anymore. Sorry for being so vague, but I
think it was posted by Yves Usson. When I go to his site now, I find some
circuits, but nothing like the extensive list I saw before. This was posted
only about a month ago. Anyone else remember this?

To make a long story short, I have some stuff I can send you privately if
you'd like. :)

Tim Servo
"I'm not lazy, I just lack motive!" - Anonymous
 
*****************************************************
> -----Original Message-----
> From: Luís Marka [mailto:luis.silviano at terra.com.br]
> Sent: Wednesday, March 19, 2003 11:11 AM
> To: Synth-Diy
> Subject: [sdiy] Moog filter
> 
> Hi all,
> A quick one: I am going to build a Moog-like 24db filter. This project
> uses
> half a dozen 2N3904s in the ladder, and my question is: how do I match
> transistors?? I don't know what parameter is important to match... VBE?
> Gain??
> 
> All my best,
> Luis Marka



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