[sdiy] Matched Transistor Specs

Aa Bb alfa.rpar.as at gmail.com
Tue Sep 1 06:46:37 CEST 2020


Dear Aaron

For exponential circuit must be used transistors for wich some parameters
(H21,...)  are defined in conditions Ucb=0 V.  Number of available
transistors for such purposes is small.

On Tue, 1 Sep 2020, 01:23 Aaron B., <aaron at zadzmo.org> wrote:

>
> I've been looking at dual transistors for exponential circuits. If I'm
> okay with surface mount, there seems to be a bewilderingly large number
> of parts available.
>
> Besides the maximum voltage/current ratings, what should someone look
> for in a good exponential converter pair? Do any of the typically
> published specs like Vceo, Is, beta, etc matter much in this use case?
>
> --
> Aaron B. <aaron at zadzmo.org>
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