[sdiy] Matched Trannys for linear V->I?

[patchell]

harry wrote:

> Well this would be preaching to the choir (again) but
>
> Dual trannies joined (or separate...) at the emitter would
> do well.
>
> Analog Devices MAT-01, 02,  dual, or -04 quad.
> National LM394 supermatch npn pair
> 2SC1583 and 2SC3381 npn
> 2SA798 and 2SA1349 pnp
>
> CA3046 npn array (5 transistors)
> CA3094 array (3 good npn... 2 kinda crappy pnp...)
>
> There are some from THAT company ... someone else
> probably jim patchell will post those numbers.
>

    THAT120 Quad PNP
    THAT140 Dual NPN/Dual PNP
    THAT100 Quad NPN

    The THAT transistor arrays have the advantage of being dialectrically
isolated, where most arrays are diffusion isolated.

    If you want to purchase onesy twosy type quantities, I sell the THAT120,
THAT140 and the MAT04 at the 100 peice cost.  Email me for details.

>
> There are other dual trannys that are NOT monolythic
> (do not share the same silicon wafer) ... these are worse
> than monolythic pairs... but better than random selected
> trannies.
>
> Gluing trannys together will help keep temperatures matched.
>
> H^) hary
>
> Dr Strangelove wrote:
>
> > Are there any devices which would make creating a linear voltage to current
> > converter easier?  I'm thinking something like a matched pair of transistors
> > who are wired for a linear converter (i.e. the IC has 4 pins and contains
> > two matched pnps with emitter 1 connected to base 2).
> >
> > Thanks for the help.
> >
> >          -=<Jonathan Pratt>=-
> >        (Phdinfunk at hotmail.com)
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp

--
 -Jim
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