Re: [CAD_CAM_EDM_DRO] Re: 5V+ Supply for Gecko? Not so confused anymore. :)

Abby,
You may need a buffer chip as well. I use a 74ACT541 chip for this.
The new mother boards run on 3.6v and not 5v so they may not drive the optos
reliably. The buffer will take the 3.6 and output a good 5v signal.
Try it first but if you start missing steps this may be the solution.
An alternative to getting power from the PC is to buy a 9v or 12v wall
wart add a 7805 3 pin regulator . Wire the ground to the PC parallel port
ground and use that 5v.
They also make them that have the 5v regulator built in.
Jim

----- Original Message -----
From: "Abby Katt" <cnc@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 23, 2004 3:41 AM
Subject: [CAD_CAM_EDM_DRO] Re: 5V+ Supply for Gecko? Not so confused
anymore. :)


> Thanks for all the help on this guys/girls, I understand it a lot
> better now. I didn't think that the parallel port provided such
> LITTLE current per pin as that.
>
> Anyway, I've decided not to use the servo box's PSU for just now, and
> think I've stolen a nice source for the power supply. I invited an
> old PS2 keyboard out for a walk with me, and them **BAM**! I cracked
> open it's plastic shell for the juicy wirespines inside. I hope that
> the PS2 mouse port will be able to provide enough current for the
> opto-isolators.. but I'm pretty sure the mouse port's 5V+ is rated
> for at least 50ma...
>
> Nearly ready to go...
> Thanks for all the help.
> ~Abby
>
>
>
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