[sdiy] THAT2180A

[drheqx]

 THAT had this design note on their site which is what I was reading

http://www.thatcorp.com/datashts/dn120.pdf



On Fri, Nov 27, 2020, 7:15 PM S Ridley <spridley1 at gmail.com> wrote:

> >  Separate question: Is there any analog way that *does* give a constant
> power panning curve?
>
> Serge Modular were keen on equal power panning.  I think they did some
> square root stuff by logging the CV, halving it and letting the expo
> response of the VCAs do the anti-logging.
>
> Steve
>
>
>
>
>
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> On Fri, 27 Nov 2020 at 20:08, Tom Wiltshire <tom at electricdruid.net> wrote:
>
>> Do you mean this one? “VCAs in a Pan potentiometer Application”:
>>
>> http://www.thatcorp.com/datashts/dn120.pdf
>>
>> Personally, I never liked the hacky make-it-nonlinear approach. In
>> practice it works more than well enough. If it was me, I’d use a lookup
>> table and a DAC. Whatever floats your boat, I guess…;)
>>
>> Separate question: Is there any analog way that *does* give a constant
>> power panning curve? I remember seeing the “expo crossfade” example from
>> the SSM2024 datasheet which uses a differential pair to split a linear
>> control current between two linear VCAs (e.g. not applicable to the expo
>> VCAs we’re discussing here) . If I remember correctly, when I tried it, it
>> gives subtle “hole in the middle” effect as a panner, as the volume
>> apparently drops as the signal reaches the centre. This experiment was a
>> long while ago though, and I might be mis-remembering.
>>
>> What others have said about the VCAs is all true - you pick the
>> cost/quality ratio you’re after and then the parts choice will make itself!
>>
>> Tom
>>
>> ==================
>>        Electric Druid
>> Synth & Stompbox DIY
>> ==================
>>
>>
>>
>> On 27 Nov 2020, at 16:27, Ben Gebhardt via Synth-diy <
>> synth-diy at synth-diy.org> wrote:
>>
>> I second what Eric said and would note that THAT has a good app note for
>> a pan pot application which I used for a mastering grade cross fader. Worth
>> a look.
>>
>> On Nov 27, 2020, at 10:50 AM, Eric Schlappi <eric.schlappi at gmail.com>
>> wrote:
>>
>> 
>> if you are going off of the THAT Corp app note for equal power panning,
>> it is totally possible to adapt that to the ssi2164. Just change the
>> scaling and you need to invert and offset one side.
>>
>> On Fri, Nov 27, 2020 at 7:27 AM drheqx <drheqx at gmail.com> wrote:
>>
>>> I'm looking at the THAT2180A for a voltage controlled pan pot
>>> application. They're not cheap. Any ideas for a less expensive vc pan pot?
>>>
>>> Mike
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