[sdiy] 1K or 2K Tempco ?

[Magnus Danielson]

From: jbv <jbv.silences at club-internet.fr>
Subject: [sdiy] 1K or 2K Tempco ?
Date: Tue, 06 Apr 2004 22:15:13 +0200
Message-ID: <40730FCE.65ECD03E at Club-Internet.fr>

> Hi again,

Hi JB,

> Still looking for a 1K Tc for the SEM module.
> But I just noticed that  Midwest Analog sells
> 2K +3500ppm/°C... So I was wondering if
> this could be used in the SEM VCO instead,
> and if other components values need to be
> modified accordingly, or if the 10K trimpot
> (T6) is enough to compensate the difference ?

No, the 10k is not enought, since it is in series with a 100k resistor. You
should double the 57,6k resistor instead, so that the R8/R9 relation stays the
same. You could possibly replace the 100k resistor with a 200k resistor. It is
probably safe to stay with a 10k resistor, but I need to check that. A 208k
resistor might do the trick otherwise.

Cheers,
Magnus