From list@sevush.com Thu Dec 25 18:05:33 2003
Subject:RE: Speed Control Pedal

Claire, thanks for shedding some more light on this highly charged topic.

Some folks might actually be looking for the electrocuted look, and
smoke/fire and brimstone always make for great stage shows, but at least
they've been warned.

> Dan and Ron,
>
> Thanks for your common sense with this Leslie speed varying thing.
>
> May I summarise:
> a) Running mains through any pedal not designed for mains
> voltages WILL be
> a potential ELECTROCUTION HAZARD.
>
> b) Running the amount of current required by just about any
> motor through a
> carbon pot will DESTROY it - definitely smoke, possibly fire.
>
> c) Running mains voltages through any connectors not
> designed for it (eg
> audio connectors etc.) will almost definitely constitute a FIRE *AND*
> ELECTROCUTION hazard. (You can get away with it if you know
> what you are
> doing, but it is not recommended for physical , insulation and current
> carrying reasons- some mentioned in the previous email.)
>
> (By the way, there is a range of XLR connectors specifically
> designed for
> mains voltages and currents. They are the same external size
> as audio XLR
> connectors but they have a RED insulation insert around the
> pins and larger
> (and incompatible) pins to all other types of connectors.)
>
> d) There is no easy way to control the speed of motors that are not
> designed for variable speed. Eg Witness the synchronous
> motor that Hammonds
> are famous for. It will run at a CONSTANT speed independent of normal
> variations in mains voltages. (That's the whole point).
> Brush-type motor
> speed can be changed by varying the *Average* voltage. This
> is normally
> achieved by a Pulse Width Modulation controller such as a normal lamp
> dimmer. This will NOT work with brushless or synchronous
> motors and will
> probably present a burn out/fire hazard for both controller and motor.
>
> Sorry about the capitals but I wouldn't want anybody on this
> list to be
> burned or electrocuted by the absolutely unsound suggestion
> of running mains
> through a normal carbon pot type volume pedal.
>
> Merry New Year to all. (have a safe one !)
>
> Cheers !
> Claire
> Australia
>
> ----- Original Message -----
> From: "Dan S"
> To:
> Sent: Friday, December 26, 2003 11:32 AM
> Subject: RE: [CWSG] Speed Control Pedal
>
> > Ron, thanks for turning my cryptic (but well founded)
> concern into bite
> > size chunks all could understand.
> >
> > There's another problem in this potential setup - Leslie motors are
> > brushless and brushless motors really don't like to have
> their voltages
> > varied. I have heard from many Leslie experts and fanatics
> that the right
> > way to do this is varying -
>
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