Re: [CAD_CAM_EDM_DRO] +5V

meneercen wrote:

>
> Hi,
>
> >From previous posts, it is clear that the best solution to provide
> the +5V for the Gecko drives is to tap it from the PC itself.

Yup.

> However, if one is to use a notebook computer, even if that can be
> done easily, I think one would be very about tapping the +5V from the
> notebook. I hope to provide for an independent source of +5V from the
> power supply of 48V. What is the best way to provide for this?

Buy a 120VAC input +5V output Wall Transformer, and tie the ground of
the wall transformer output to pin 18 of your parallel port line
(a ground line on the PC).

Be aware that some wall-warts do not generate a nice flat DC, some
have huge ripple component.

After that is all said, +5V from the PC is better...and you might
want to put a little capacitor across the +5V and pin18 ground
to add a bit of despike/de-ripple safety margin.

Doug Fortune
http://www.cncKITS.com