[sdiy] linearizing an exponential CV

Harald sdiy at haraldswerk.de
Wed Jan 13 08:05:04 CET 2021

Hey Neil,
I have on implemented here: 
It is based on the National AN30 p4 fig3. You can download the schematic 

Am 12.01.21 um 23:06 schrieb Neil Harper:
> hey everyone,
> i'd like to linearize a control voltage that rises exponentially. i'm
> familiar with how to do the opposite, taking a linear voltage and making
> it exponential (transistor pair expo converter or 2164), but I have no
> clue how to do the opposite.
> on paper I think I can take the exponential rising voltage, invert and
> offset it to get a falling log curve and then feed that thru an expo
> converter to get a falling linear curve. then I can invert and offset
> that linear curve to make it rising 0-5V. but that definitely doesn't
> sound like the most efficient way.
> -- 
> /// Neil Harper
> /// Every Wave is New Until it Breaks
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