PDA

View Full Version : Power supply board?



wierdscience
02-27-2009, 11:32 PM
Where did I see it?It was a power supply that mounted right to the top of the filter cap via the caps terminal screws.

Anyone know?

John Stevenson
02-28-2009, 04:58 AM
Not seen them around for a bit, I did look a while ago as I could have used one.

Finished up milling some of these out of thin brass sheet bonded to phenolic board.

http://www.stevenson-engineers.co.uk/files/power%20cap.jpg

made for two different size caps by the holes the middle strips. The holes in the bottom take four fuse holders, slots are for the bridge rectifier and the other odd holes are for terminal strips.

The spare brass is peeled away after cutting.

.

wierdscience
03-04-2009, 10:30 PM
Thanks for that John,probably what I will end up doing.

I can't for the life of me remember where I saw them.It wasn't long ago and they were like $20 including the rectifier and terminals all done up,just add cap and transformer.Seems like they were capable of 15amps @72VDC.

AlleyCat
03-05-2009, 10:44 AM
Maybe this is what you were thinking of. It's $39 and well made.

http://ajaxcnc.com/images/comp_bridgerectifier_large.jpg

Paul Alciatore
03-06-2009, 12:30 AM
Maybe this is what you were thinking of. It's $39 and well made.

http://ajaxcnc.com/images/comp_bridgerectifier_large.jpg

That is just a bridge rectifier and a bleed resistor to discharge the capacitor when power is turned off. Oh, and two terminal strips.

Hardly worth the price. For $40 you should be able to get a regulated supply board.

John Stevenson
03-06-2009, 03:13 AM
In most case you don't need a regulated supply board just a very simple power supply.

Bruce Griffing
03-16-2009, 10:28 PM
I would consider this module:

http://www.pmdx.com/PMDX-136/

It contains a power sink that operates when your motors are in rapid deceleration. The sink will absorb the generated voltage and prevent damage to your stepper or servo controller. You can also accomplish the same with a simpler supply if you have significant voltage margin. I think the power sink is a better way myself.

No connection with PMDX.