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

[Dr Strangelove]

I was pretty sure that I would need the trannys seperate at the emitter.  
The only way I've seen to make a linear converter is to have just one of the 
emitters connected to the base of the other.  How would I do it with the 
emitters tied together?

I know this is a probably a mucho basic question, so I appreciate the help.

         -=<Jonathan Pratt>=-
       (Phdinfunk at hotmail.com)




>From: harry <harrybissell at prodigy.net>
>To: Dr Strangelove <phdinfunk at hotmail.com>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Matched Trannys for linear V->I?
>Date: Mon, 01 Oct 2001 21:16:20 -0400
>
>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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