[sdiy] Active VCO temp compensation

[Simon Brouwer]

Jim Patchell has some real nice documentation on his VCO that uses this
approach: http://www.oldcrows.net/~patchell/synthmodules/vco.html


George Hearn schreef:
> I'd like to modify my polysynth design to use active temperature
> compensation by making the VCO's output a temperature reference voltage
> that
> has a TC of 3300ppm/c.  This would then be used to derive the DAC
> reference
> voltage in order to compensate for the VCO exponential converter
> temperature
> drift.  I would like to do this by using a MAT04 quad matched pair or
> LM3046, using two transistors to make the exponential converter and
> somehow
> use the others to generate a voltage proportional to Vt.  Does anyone have
> any ideas?  The CEM3374 had this arrangement and it was successfully
> employed in the Oberheim XPander and Matrix 12.  Regards, George
>
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-- 
Vriendelijke groet,

Simon Brouwer
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