Re: Gecko Bridgeport saga - Gib adjustment?

I am using the red line from a power connection used in the computer
for drives. It is connected to the signal generator which is
designed to be used with stepper motor drives. The 5 vDc to the
Geckos is from the signal generator.
Thanks
Keith

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Stephen Wille Padnos
<spadnos@s...> wrote:

> I hope you're not putting 12V directly to the step/dir

common???!!!??

> Also, where do you get 12V unregulated from a computer? If you

have a

> 12V line that's not between 11.4 and 12.6V, then you need a new

power

> supply. (It should be much closer to 12, but I think the spec is

+-5%.)

>
> They Geckos are set for 5V operation only. You can use 12V, but

you

> need current limiting resistors if you do it (It's not recommended

in

> any case). I think the current draw for each input is around 10-

15 mA,

> and you want 7V across the resistor. That makes for a 4.7K - 6.8K
> resistor in line with each leg. (You need to use one per input

since

> the total current through the limiting resistor wouldn't be enough

to

> turn them both on at once.)
>
> If you're using a floppy/hard drive power connector, just use the

red

> wire instead of yellow.
>
> - Steve
>
> Keith Clark wrote:
>
> >Ok great, I will try it in the morning. I just picked up a

switch

> >today that I can use nicely. But I am using a 12V unregulated DC
> >supply from the computer. Do I just connect a wire from Dir

input

> >through a switch to the ground where the black wire from the
> >computer (I assume ground ) connects?
> >
> >Thanks
> >Keith
> >
> >