[sdiy] uA726 temp setting

[Kevin Lightner]

>Hi Kevin,
>
>May I suggest looking at the setup procedure for the Moog Source
>oscillators?

Unfortunately, it's not really applicable here.
Sources are kind of a bitch to tune also, but the temp setting is well defined.
I can measure room temp and apply their formula no problem.

>
>Those are based on a thermostated CA4046. The procedure is given for setting
>the internal temperature to 130 degF, by measuring the millivolt drop at the
>expo transistor base-emitter junction. The BE drop increases by 2.2
>millivolts per degree, so you can measure the internal temperature by
>measuring the BE voltage. The formula is given in the Source service manual.

I just don't know the temp they're expecting and since it sets the 
base freq, will apparently be something that is somewhat variable. 
Obviously why didn't install a fixed resistor to begin with.

>
>Reliability of solid state devices is directly related to temperature. Using
>a lower temperature will extend the uA726 lifetime.

Which is kinda funny. I rarely replace Minimoog 726's and this is a 
sonic six ;-)
Shit happens though.

But thanks. :)


Snowing here now (in Southern California!).
My satellite broadband is diving as we speak :(


-- 
Regards,
Kevin Lightner

Myself: http://www.synthfool.com
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