[sdiy] Tempco vs. "Substrate Oven" in VCO and VCF

[Sean Dynan]

I didn't think a tempco prevented a VCO going out of tune when ambient
air temperature changes. I thought the tempco was there to 'guarantee'
correct scaling. :S

On 29 February 2016 at 13:48, Mattias Rickardsson <mr at analogue.org> wrote:
> On 29 February 2016 at 11:45, Roman Sowa <modular at go2.pl> wrote:
>> Controlled oven obviously takes more power to heat it, so that's probably
>> the reason for not so widespread solution. You need to heat it up to the
>> temperature that is not likely to happen in regular conditions, at least 40
>> deg. C. About 40-100mA to waste just on heating.
>
> 40 mA seems like a lot of current just to push the temperature up 15
> degrees... but it of course depends on how well insulated the chip is.
> The uA726 seems to draw around 7 mA in room temperature if I read the
> datasheet correctly, and I was under the impression that it's working
> at a quite high temperature.
>
> The Moog Prodigy has some heating going on in its oscillators (to the very left)
> http://www.emusic-diy.org/MoogManuals/Prodigy?action=AttachFile&do=get&target=prod9.gif
> or is it something else?
>
> /mr
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-- 
Sean