[sdiy] Panning (again)

[Oren Leavitt]

Just for simulation proof of concept and to highlight the sin/cos 
relationship. In practice you can pick E96 resistor values with similar 
ratios.

- Oren

On 12/15/20 3:35 PM, Didier Leplae via Synth-diy wrote:
> Out of curiosity, why 7.07k resistors? That seems like such a specific 
> value
>
>> On Dec 15, 2020, at 3:27 PM, Mattias Rickardsson <mr at analogue.org> wrote:
>>
>> 
>> Douglas Self shows this connection as the first example in the 
>> Passive Panpots subchapter of his Small Signal Audio Design book, 
>> with the description
>> "... has several disadvantages, not least the poor offness when 
>> panned hard over, caused by the current flowing through the wiper 
>> contact resistance to ground."
>>
>> The rest is left to the reader, but thanks to separated L/R channels 
>> with law-bending resistors, the story ends well. And most of you have 
>> already figured out that the next subchapter is even better. ;-)
>>
>> /mr
>>
>> Den tis 15 dec. 2020 19:34David G Dixon <dixon at mail.ubc.ca 
>> <mailto:dixon at mail.ubc.ca>> skrev:
>>
>>     Hey Team,
>>     I've been thinking about this panning thing, and I came up with
>>     the following very simple pot-based panning circuit:
>>     The gain responses of this circuit are shown below, and compared
>>     with sin and cos responses:
>>     I believe that I can create a voltage-controlled version of this
>>     simple pot panning circuit fairly easily by replacing the pot
>>     with a pair of modified Irwin 2164 circuits.  I did this for the
>>     Morphing LFO.
>>     Would this response suffice as an "equal power" panner?
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>> <SimplePanner.png>
>> <PanPlot.png>
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