klm 366 - "lenses"

[Rene Schmitz]

Hi Marjan,  DIYers.

At 22:30 04.02.00 +0100, >>>marjan<<< wrote:
>those are cheap NTCs used for measurement of temp, here they compensate
>CVs ADR parameters of SSM env generator. They're used in upper leg
>of voltage divider. I plan to use one in my little 1VCO synth project
>but I haven't still managed to get some extra time to solder it :(
>(it was like exp how good it'd be for vco but your result is promising
>:)


I've compensated VCOs using this approach. Since the NTCs have expo
temperature dependancy, you get compensation only for a "small" temperature
region (compared to the -50..150deg range for the wirewound). But this is
sufficient, maybe a range of +-10deg arround room temp. Look at this for an
example: (I know it says preliminary...)
http://www.uni-bonn.de/~uzs159/566lfo.gif
I've used this compensation scheme in the main VCO of one of my machines,
it works remarkably good.

Bye
 René






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