[sdiy] uA726 temp setting

[Ray Wilson]

Why not write to the master and ask him.

Go to: http://www.bigbriar.com/

Ray

----- Original Message ----- 
From: "Kevin Lightner" <synthfool at synthfool.com>
To: "synthdiy" <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, March 17, 2005 9:20 PM
Subject: Re: [sdiy] uA726 temp setting


> Thanks on the uA726 advice.
> 
> It's not as simple as it seems because they have 5 trimmers, all 
> interactive, controlling each osc (one counted twice.)
> While these trims all affect scaling, Moog *didn't* include one 
> simply for straight offset or initial freq.
> To have the knobs line up where they should, it's not so easy because 
> you're adjusting a sliding scale.
> It's not like most synths where you can get it to scale fine and then 
> transpose it to whatever base frequency afterwards without affecting 
> scaling.
> 
> I'm going to find what range I have to play with, so I'll see what 
> the base, unheated freq is and the highest freq possible (if it's 
> through a 100K to begin with, it shouldn't hurt it if the trimmer is 
> maxed) and see how it scales at median ranges in the middle 
> somewhere. Given that Moog often chose trimmers and accompanying 
> resistors so their trimmers landed in the middle pretty well, I can 
> center all the other trimmers and bring it up to temp, matching the 
> lowest C to true pitch. That might home it in and still provide for 
> some fine tuning range.
> It really is an awful design.
> They have a huge carbon resistor to set the keyboard current too.
> Maybe they were expecting an educational synth to do also do 
> different scales easily? ;-)
> 
> Oh and no slam Peter, but I *did* check what a Minimoog uses.. a 
> 75K.. said so in my first post.
> Thanks tho.
> 
> -- 
> Regards,
> Kevin Lightner
> 
> Myself: http://www.synthfool.com
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