[sdiy] AVR Synth - Potentiometer size

[Gabriel Lindeborg]

Ah, I see, alright. Would have thought it would be the other way around 
with the inputs....
But the save in current consumption is minimal as you point out so I 
will go w. 20k potentiometers as suggested.
Thank you!

//Gabbe

Jaroslaw Ziembicki wrote:

>>By the way, why use 22k potentiometers, is there a specific reason for 
>>this? Potentiometers with a higher value would allow for less current 
>>consumption and as far as I can see they are only used as voltage 
>>dividers. Maybe I'm missing something?
> 
> 
> According to Atmel, the impedance being seen from the analog inputs
> should not exceed 10k. Therefore the potentiometer resistance should
> lay below 40k. Theoretically.
> In the practice, 50k and 100k pots will work correctly. Just a minor
> nonlinearity may be expected.
> By using 100k pots approx. 1.4 mA supply current can be saved.
> 
> Regards to all AVRSYN builders
> 
> Jarek (still a bit tired after his first marathon on last Sunday)
> www.jarek.synth.net
> 
>