[sdiy] 3300ppm or 3600ppm?

[Paul Schreiber]

+3300 is what you want.

Paul S.

----- Original Message ----- 
From: "George Hearn" <georgehearn at btinternet.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, September 10, 2008 4:22 PM
Subject: [sdiy] 3300ppm or 3600ppm?


> Which resistor is best to compensate for the temperature drift in the
> exponential converter's typically used in VCO's or VCF's like the ASM1-VCO
> R14 (http://home.swipnet.se/cfmd/synths/friends/stopp/asm1vco-1.1.pdf) or
> for the SSM2040 4-pole VCF (Figure 9 on datasheet).  3300ppm/C and 
> 3600ppm/C
> seem to get used interchangeably.  Surely 1 is correct to use in these
> scenarios.  I see the "Tel Labs Q81" come up in lots of schematics,  is
> 3600ppm/C used in these schematics because that's just what the TC of a 
> Q81
> was and is 3300ppm/C then ideal?  George
>
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