[sdiy] Transistor Matching

[Tim Ressel]

Yo,

Ahh...

I replaced the TL082 with a LT1113. THis is looking
usable now.

--tr

--- Tim Ressel <madhun2001 at yahoo.com> wrote:
> Yo,
> 
> Aha!!!!
> 
> It seems I was having a noise problem. I sprinkled
> caps all over the circuit and the offset problem all
> but disapeared. The offset is down to 2mV. 
> 
> --tr
> 
> 
> 
> --- Grant Richter <grichter at asapnet.net> wrote:
> > The Moog app note says 2 millivolts, but by
> grading
> > them into 1 millivolt
> > bins, you can easily match to 1 millivolt.
> > 
> > Silicon changes around 2 millivolts per degree C
> > (variously quoted by
> > references any where between 1.8 and 2.7 mv/C)
> > 
> > So the Moog spec assumes a possible error of 1
> > degree C.
> > 
> > BTW, the exact value of the current source is not
> > important, only that it be
> > repeatable.
> > 
> > > By the way, do you know how close transistors
> need
> > to
> > > be? What is a good matching number to shoot for?
> > > 
> > 
> 
> 
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