[sdiy] Alternatives to Faders

[Edward King]

Daniel,

comments added inline. Thanks for responding!

Regards

Edward


----- Original Message ----- 
From: "Daniel Araya" <daniel.araya at sr.se>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, March 07, 2007 7:05 PM
Subject: Sv: Re: [sdiy] Alternatives to Faders


>>>> "Edward King" <edwardcking2001 at yahoo.co.uk> 2007-03-07 16:08:42 >>>
>>Ball? No
>
>>you know the pitch-bend and modulation wheels you normally get on
> synths?
>>Thats the way Im going at the moment...although the wheel Im using is
> okay,
>>Im having problems finding wheels / dials that are similar to
> modulation
>>wheels so if anyone knows of any, I would be very grateful. They need
> to be
>>roughly 10mm wide and the same diameter (or close to it) as modulation
> or
>>pitch-bend wheels.
>
> Hi,
>
> Nice idea!
> I would make them with a CNC-mill or lathe and make them out of 10mm
> aluminium. Then i'd drill the holes for the light to pass throug
> directly into the wheel and get the wheels anodized for a nice finish.
> Mount them on a common shaft and put the pcb with the LED/photo
> transistor-"fork" beneath it all.
>
> /Daniel

Great idea about miling them from Aluminium. I was looking at some 
commercial aluminium wheels last night and they look the part, are the right 
size...and come with a standard 1/4 inch shaft hole.
I think I may have given the wrong impression though about the sensor 
setup...
What you've said (above) wont work that well because of ambient light.

The wheel should run against another smaller wheel which is mounted on the 
same shaft as the optically encoded disc. This is slightly back from the 
panel hole (which the control wheel sticks out of).
This avoids the ambient light problem and another - possibly more important 
one- infection of the optics and electronics by crap getting in down the 
panel hole. Beer, sweat, grease, chicken noodles...would all cause havoc 
within a short space of time.
Think back to the times when you've had to take the ball ouot of the bottom 
of your mouse to remove the gunk from the encoder shafts...

Also, the PCB with the electronics and transistor-LED fork on it should sit 
upright so that any crap or liquid passes by.
In my case, Ive designed it so that the whole assembly is contained in a 
small 12mm x 70 mm x 50mm aluminium or plastic box.  Ive not built this yet, 
but will try to do so at the weekend.
 


		
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