[sdiy] Music Easel sliders determined to be linear

[mark verbos]

On Jun 28, 2009, at 2:03 PM, Aaron Lanterman wrote:

>
> On Jun 28, 2009, at 2:01 PM, mark verbos wrote:
>
>> uh, sorry typo.
>>
>> The sliders are 50k audio taper. The 120k resister on the PCB from  
>> the top to the wiper bends the taper more toward linear.
>
> Huh - I can't figure out why I'm getting such a beautiful current  
> match using linear sliders. Will need to think more.
>
> - Aaron


Generally speaking, in a Buchla, all CV inputs react linearly to the  
user. I mean, since all pitch, filter cutoff and VCA gains are  
exponential, you need to send them a linear CV. Envelopes are linear,  
etc. Because of this and the fact that almost everything is voltage  
controlled, most everything needs a linear pot for it's panel control.  
The exceptions are attentuators on audio and FM inputs and time  
constants that are not voltage controlled (280, 255, 230). The sliders  
on a 208 are audio taper with a tapering resistor to make them more of  
an S curve. This should make them a little more sensitive in the  
middle where the action is.  Is that why the lines on the panel are  
closer together in the middle of the slider's travel?  In practice,  
you will have good luck using linear control on your clone modules.


Mark