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

[harry]

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.

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)
>
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