Turntable Power Supply

[aflyer]

I am converting a Geiger HO turntable to use in my S layout.  The motor for the turntable requires a 12 volt DC power supply, but no other details are included in the instructions.

I have looked at HO transformers, which are primarily DC voltage, but that seems like it might be overkill.  I have also looked at 12 volt DC power supplies/transformers, will these work for what I need?

The MA rating on these seem to range from 200 to 800 and then on to 5 Amps or more as the price increases, but I have no idea how that relates to what I need. I pasted an example below, this one is 12 VDC 500 MA.

http://cgi.ebay.com/12-Volt-Power-Supply-AC-DC-Transformer-Plug-Type-NEW-/180570071853?pt=LH_DefaultDomain_0&hash=item2a0ad0a32d

Can anyone tell me how to determine what I need? 

Thank you,

George 

[lionelsoni]

Assuming that the turntable is electrically no more complicated than a DC motor, you should be able to make DC from your transformer (or another) using a bridge rectifier.  Then you will be able to control the turntable's speed.

[aflyer]

Bob,

Hi, thanks for the response. I actually thought about that but kind of figured it would be easier to just go with a seperate power suply for the turntable. 

The turntable has controls for CW & CCW rotation, an auto setting for indexed stops, and a momentary switch for manual rotation.

I will look into a bridge rectifier, but I am still interested in determining whether or not the kind of power supply I included in my original post has enough power to run a 12 volt DC can motor.

Thank you again,

George 

[lionelsoni]

If you have no current specification for the thing, you'll just have to put 12 volts on it and measure the current.