Re: Clarifications needed - 5 volts

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Harvey White <madyn@i...>
wrote:

> On Fri, 12 Sep 2003 21:40:03 -0600, you wrote:
>
> >> Now I'm confused.
> >> I thought it was either ground from the parallel
> >> port, or +5V from the compueter power supply?
> >
> >When a pin goes high it is at +5V (well it should, but some systems
> >don't make the full swing), but there is not enough current from

the pin

> >for more than one LED. G201s are wired to use a common +5V and

switch on

> >the LED in the opto when the pin goes low and current flows to it.
> >G210's can be set up to use the current from the pin with a common
> >ground.
>
> One thing to remember is that an average TTL gate can sink 16 ma,

but

> only source 400 or so ua....
>
> Hence it's much preferred to sink the current from another 5 volt
> supply.
>
> Harvey

reading the posts, it seems that simplicity is desired.

the 5 volts are easy to pick off from inside of the computer on any
power connection.

If you have a spare wye connecter you can cut one of the ends off,
pluge it into one of the spare power connectors, and snake the wire
out of the case and into your driver enclosure.

I made a breakout board and used 12 volt relays so I brought out both
12 and 5 volts and ground.

I bought a molex connector and mounted it into one of the PC slots
and the inside connects to the PC power connector. then I made a
cable between the 2 boxes.

Also, if you are heading to radio shack, considder buying one of the
very small perf boards. you can strip an old printer cable and
solder each wire on one of those. it allows you to mount the board
and to solder other wires to it. sure beats trying to solde wire to
wire, or having a fistfull of wire connectors.

Dave