[sdiy] Linear current source - temperature compensation?

[Justin Owen]

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