[sdiy] XR2206 temeperature stability within +/- 5%
list at mikebeauchamp.com
Fri Jul 3 00:44:57 CEST 2020
On 7/2/20 11:09 AM, Jean-Pierre Desrochers wrote:
> I need a pure sine wave generator adjustable from 10Hz to 60Hz at around 5v
> The adjusted frequency should stay stable within +/- 5% temperature wise.
> The project inside metal enclosure could have temp of up to around +40deg C.
> I have a bunch of XR2206 VCO IC on hand to use.
> I wonder if the best capacitor to be used here would be
> A polystyrene type for temperature stability.. (??)
> I'll use 1% metal film resistors for the rest of circuit..
Hi JPD, it's been a long time since I've used the XR2206, but it was
stable enough for music even with an exponential converter for 1V/OCT
tracking added to it.
For the Capacitor, I'd use a ceramic NP0/C0G and I'd check the datasheet
on the resistors - some metal film resistors have different temperature
The XR-2206 datasheet says "Excellent Temperature Stability, 20ppm/°C,
Typ". So what's that, less than .1% change across a delta 40C?
I'm not really a math guy (math fatigue from University..), and if you
have the IC's already, build one and try it. I've also set up small
experiments heating and cooling circuits, using a laser thermometer to
track and graph changes and that's easy to do if you also want to see
how much things are changing.
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