Motorized POT

[david leigh]

>From: "The Dark force of dance" <batzman at all-electric.com>
>To: synth-diy at mailhost.bpa.nl
>Subject: Motorized POT
>Date: Sun, 25 Apr 1999 12:56:49 +0900
>
>Y-ellow Y'all.
>	I can get some little motorized pots. I had this crazy idea of 
putting one
>on my mixer. I may well have enough resources (and code space) left 
to
>drive it but I need to drive it as simply as possible. And! I don't 
have a
>clue about driving motors.
>
>I realize the theory is simple enough. You use the feedback from the 
pot to
>report the position and then drive the motor till it reaches that 
position.
>I'd assume that the motors on these pots would be a tiny servo but 
what is
>the simplest way to drive them in both directions. I've also heard 
where
>you really need a separate power supply for the servo 'n' stuff. The 
bottom
>line is that if I can't do it with just a couple of transistors, 
using PWM
>from the micro it's probably not worth doing. But if there's some way 
of
>doing it then it becomes feasible.
>
>Any help would be most appreciated.
>
>Thanks in advance.
>
>Be absolutely Icebox.
>
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Are probably wrong, but I wouldn't have thought a motorised pot would 
be fast enough for a mixer. How does yamaha do it with their "flying 
faders" I would have thought everything was done digitally with the 
faders providing a visual indication of loudness?

dave

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