[sdiy] mached transistors

[Theo]

Only the pairs have to be matched, the closer the better.
For a ladder its enough to have the top and bottom pairs matched.
But matching all pairs does give slight a improvement.
Using LM3046 ICs is also an alternative,
each IC contains one matched pair and 3 separate transistors.


Theo



From: Terje Winther <terje.winther at notam02.no>

> Hello,
> I am measuring some transistors to get "mached transistors" needed for
some
> VCFs (moog-ladders) and VCAs.
> How close do they have to be to be called "matched"?
> totally equal? 1% apart? 2% 3-5%?
> Also, for the moog-ladder filters; do they have to be matched between the
> ladder "staps", or is it enough to have the two transitors of each "step"
> to be matched?
>
>
> tw.  :)
>
>