Hello I used to be able to purchase a 24 volt AC rotary speed
controller for some small fan coils I supply. These fan coils draw up
to 2 amps. The manufacturer in the US seems to have gone out of
business. Does anyone have an idea where I may be able to get this
type of switch. Rotary is preferred, but I will try most anything.
Thank You, Jim

On Dec 20, 6:43 am, chat...@gmail.com wrote:
> Hello I used to be able to purchase a 24 volt AC rotary speed
> controller for some small fan coils I supply. These fan coils draw up
> to 2 amps. The manufacturer in the US seems to have gone out of
> business. Does anyone have an idea where I may be able to get this
> type of switch. Rotary is preferred, but I will try most anything.
> Thank You, Jim

There are several ways to control the speed of an AC motor. It
depends on th specific type of motor, quality, output speed torque...
Here is a link to a basic (cheap) one made by Dart Controls. You may
also want to check Baldor, or Bodine. They make small motors and may
have controls. Other big catalog distributors to check with are
Allied Electronics, or Newark. Both have pretty good web sites to
search for this type of control.

http://www.grainger.com/Grainger/items/5JJ60

On Thu, 20 Dec 2007 03:43:36 -0800 (PST), chaters@gmail.com wrote:

>Hello I used to be able to purchase a 24 volt AC rotary speed
>controller for some small fan coils I supply. These fan coils draw up
>to 2 amps. The manufacturer in the US seems to have gone out of
>business. Does anyone have an idea where I may be able to get this
>type of switch. Rotary is preferred, but I will try most anything.
>Thank You, Jim

The basic schematic on this site works well. 0-30 volts 0-10 amps

http://www.angelfire.com/ab6/userper/scr_throtle.htm
Potentiometer SCR Throttle Schematic is the one you want.

The other circuits try to emulate mass and inertia to give realism to
the model trains they control - and are lots more complicated.
--