Re: Power supply

Abby,

Not to take any of the warning aspects of your message away; it's
generally good advice IMO.

FWIW, there are several online resources telling how to chain PC
power supplies successfully in series and parallel. I've done it
myself.

The plating and anodising groups are one place these links can be
found. More than few have cobbled together large amperage, 5 volt
supplies; others have made 24-36 volt supplies.

Again, I'm NOT disagreeing with your warning; just pointing out that
in the right hands, using the right info, and accepting the
limitations, it CAN and has been done...

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Abby Katt
<cncgroupnospam@...> wrote:

>
> Hi there,
>
> One potential problem here... you may be able to connect two

linear

> power supplies (or batteries even) in series to double the

voltage, but

> when you do that with a switched mode power supply (i.e.computer

PSU)...

> *BANG*. Switch mode PSU's monitor the output stage in a type of

complex

> "loop" so they can't be chained to double the voltage, even

putting them

> in series is likely to be asking for serious trouble...
>
> If you need 24V it's best to just get a cheap PSU that does 24V,

or even

> build your own.
> Otherwise you're at 12V, but your performance for steppers rated

24V at

> 12V is going to be abyssmal. You'd be better off with 2-3V

steppers and

> a chopper drive (Xylotex/Gecko and friends)...
>
> Regards,
> Abby
>