[sdiy] Verniers for Patch Recording

[Tim Parkhurst]

A linear motor arrangement is probably what the *VERY* expensive pro
motorized faders use. I have seen less expensive ones (I think Mouser or
Digi-Key sells a Panasonic motorized fader) and I think these use a rotary
motor and string/pulley type arrangement.

Tim Servo




> -----Original Message-----
> From: Michael Boracci [mailto:mboracci at nfpcomputer.com]
> Sent: Wednesday, October 01, 2003 10:52 AM
> To: john mahoney
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] Verniers for Patch Recording
> 
> I am pretty sure that moving pots use an armature on the wiper which is
> pulsed  to step along a rail of fixed magnets located along the side of
> the
> device. Basically a linear stepper motor.
> 
> 
> MB
> 
> 
> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of john mahoney
> Sent: Wednesday, October 01, 2003 10:35 AM
> To: harrybissell
> Cc: Czech Martin; synth-diy at dropmix.xs4all.nl; Ian Fritz
> Subject: Re: [sdiy] Verniers for Patch Recording
> 
> 
> > The "digital" pots could be used for everything... that you could
> compress
> into
> > a 0-5V or 0-3.3V range. By prescaling with opamps... or (as JH might
> propose
> > -he has in the past) ... not making the signals larger than they need to
> be in
> > the first place
> > maybe 0.5V amplitude... those digital pots could work fine.  No need for
> VCAs to
> > use them
> 
> This is a great point: design for programmability in the first place. But
> who is doing so? We are saddled with years of tradition (mostly 0-5V).
> 
> 
> > I bet a lot of you modular people would not be happy with 7 bit
> resolution...
> > the pots
> > on a Prophet V are seven bit...and they zipper noticibly.  Willing to go
> there
> > with your modular.
> 
> No, that's not quite enough. The AD digipots have 6 and 8 bits, but you
> can
> use coarse and fine pots in series to get around 11 or 12 bit resolution,
> which is more control than most of us can manage with a standard pot.
> (Separate coarse & fine analog pots may provide better than 12-bit
> precision.)
> 
> 
> > Pots are reasonably cheap, quiet, etc.
> 
> True, Harry, but pots are stupid! <G> There is no way easy to make them
> programmable.
> 
> 
> Does anybody know how moving faders are implemented on mixers? This
> technology was once found only on the high end consoles (e.g., Neve's
> Flying
> Faders (TM)), but costs have apparently come down. Still not cheap, I am
> sure.
> 
> I'd also like to know how programmability was done on the Prophet -- has
> anybody got a link to that?
> --
> john
> 
> 
> 
> 
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