[sdiy] Blackmer VCA cell

[Neil Johnson]

Roman Sowa wrote:

> 2164 is Gilbert cell
> not far from Blackmer anyway
> 2181 has Blackmer
>

THAT218x is descended from the Blackmer design.

The 2164 in all its variations was never a Gilbert cell. It is somewhat
like the Frey cell, but not quite.

Neil
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