RE: [CAD_CAM_EDM_DRO] Digest Number 4681

I built a home CNC machine a couple of years ago but always had problems
with my h bridges blowing up. I was using some Lambda regulated power
supplies 48v @ 5a.

Do you think the amplifier problem could be caused by a current spike?

Is there an equation for sizing the capacitors?

Do you attach them to the positive or negative terminal?

What type of capacitor works the best?

I would love to dig out the machine and get it running properly. Any
suggestions would be greatly appreciated!

Message: 6
Date: Sun, 23 Apr 2006 23:17:22 -0000
From: "caudlet" <thom@...>
Subject: Re: Good Deal on surplus Power Supplies

--- In CAD_CAM_EDM_DRO@yahoogroups.com, wanliker@... wrote:
>
> In a message dated 4/23/2006 1:08:31 PM Mountain Daylight Time, thom@...
>writes:
>
>Check out this neat little switcher. 48 - 56 VDC @ 5A. Built in fan.
>Universal input voltage (88-264VAC; 47-63HZ).
>
>
>Now who has a nice little circuit for dropping the voltage for use
with
>Xylotex?
>bill
>
>
>[Non-text portions of this message have been removed]


Probably can modify the switcher feedback to output the 30VDC. Might
be better off to find a 28V supply and it will probably adjust to 30.
Switchers can be used but you need to hang a larger cap on the output
to cushion the current spikes to a PWM motor drive.




Scot Darr