[sdiy] exponential converters

[spr at spridley.freeserve.co.uk]

> so far as I know, there isn't a commercially available one chip solution. 

I think most exponential VCAs could be made to behave as expo 
converters.  Bias on the input and you should get a control
current out.  The THAT 2180 would do it, the SSM 2164 would
give you four on a chip...

It's not necessarily the best way to go though.

Steve
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