[sdiy] uA726 temp setting

[Kevin Lightner]

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

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