[sdiy] linearizing an exponential CV

David G Dixon dixon at mail.ubc.ca
Fri Jan 15 23:07:39 CET 2021

Hi Neil,

I've used the linearized 2164 circuit as a straight-up logarithmic amplifier
before.  It works great. 


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Neil
Sent: Thursday, January 14, 2021 9:47 PM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] linearizing an exponential CV

On 1/12/21 5:14 PM, David G Dixon wrote:
> Hi Neil,
> What you need is a logarithmic amplifier.
> This is exactly what "linearizing" the 2164 VCA achieves.  I suggest 
> that you read Mike Irwin's article in EDN about that.

thanks david, i figured that's what the 'top half' of the linearized
2164 VCA is doing. i found that EDN article which is great, it seems like i
should be able to tweak the resistor values to get the output range that I
want. i will try this on the breadboard as well.

/// Neil Harper
/// Every Wave is New Until it Breaks

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