[sdiy] Tempco adjuster idea

[René Schmitz]

Hi Magnus, Ian,

> Which of them? I've lost track really...

There was only one. And it is an unpublished circuit, besides of that I 
send them to you and Ian as attachement, back then.

> My point was that there is two rBE to compensate, and they run under sufficiently
> different conditions since the current through the two rBEs is not nearly the same.
> On the reference transistor, the steady state current is almost perfectly the same
> all the time. On the output transistor it varies over a huge range.

It was that I pointed out that its *only* the output resistors rBE that 
is actually to be compensated. You accepted that argument.

The input transistors rBE results in a constant offset of the Vbe, which 
translates into a fixed detuning. (Leaving possible higher order effects 
aside.)

> I had some proposals for how to remedy that as I recall it. I think it came out of
> refinements of Rene's curcuit, but I don't recall it exactly now.

There is nothing to remedy, because there is nothing wrong with that fact.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159