[sdiy] Linear current source - temperature compensation?

Nathan Trites nathan at idmclassics.net
Sat Nov 12 19:37:13 CET 2016


Is there any reason for sticking with the electronotes design? If the
tempcos are only there to compensate for the temperature effect of the
transistors, if you do away with the transistor pair altogether theres no
reason for them.

- N



On Sat, Nov 12, 2016 at 8:29 AM, Justin Owen <juzowen at gmail.com> wrote:

> Hello,
>
> The classic Electronotes current source has a linear input. It's possible
> to chop out some of the exponential parts and just have a linear current
> source based on that design - however, you lose the two standard Tempco
> placement positions.
>
> So - is it possible to temperature compensate a linear-only current source?
>
> 1) Please ignore the component values...
> 2) I'm assuming the same temperature variation/dependance exists in the
> linear version...
>
> http://www.sdiy.org/juz/source_exp.png - exponential
>
> http://www.sdiy.org/juz/source_lin.png - adapted to linear only
>
> Thanks,
>
> / Justin
>
>
>
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