[sdiy] 2n3904 transistor matching stats

[Pete Hartman]

I've found that transistors on a tape almost always have very close
matching between adjacent devices.  To the point where I only bother to
check if I have some other reason to want them to be extra precise (e.g. If
I'm building for someone other than myself)
On Jun 7, 2016 4:09 PM, "Mike Beauchamp" <list at mikebeauchamp.com> wrote:

> Today I went old-school and hand matched a bunch of NPN transistors and
> thought I'd share the stats.
>
> These are bog-standard 2N3906's from Digikey, tested with the standard
> moog test schematic and read with a Fluke.
>
> #  - V measured
>
> 1  - .562
> ~
> 1  - .567
> ~
> 1  - .587
> ~
> 1  - .590
> 1  - .591
> 1  - .592
> ~
> 3  - .595
> 13 - .596
> 71 - .597
> 34 - .498
> 13 - .599
> 16 - .600
>
>
> Seems like out of 156 transistors, almost half match up within 1mV and
> most are within 5mV. But it seems like some are definitely outliers.
>
> Mike
>
>
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