[sdiy] linearizing an exponential CV

Harald sdiy at haraldswerk.de
Wed Jan 13 09:01:37 CET 2021


On the lower right corner.

Am 13.01.21 um 08:05 schrieb Harald:
> Hey Neil,
> I have on implemented here: 
> https://www.haraldswerk.de/Shak_2_Synth/Pitch_2_Voltage/Pitch_2_Voltage.html 
> It is based on the National AN30 p4 fig3. You can download the schematic 
> there.
> 
> 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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