Re: TI-H: New topic, since the list has been dead.
[Prev][Next][Index][Thread]
Re: TI-H: New topic, since the list has been dead.
AT keyboard ports were reated to 1/2 amp current @ 5V. I'm unsure about ps/2
keyboard ports, but I'm sure it's more than the serial port.
I have an oem gps receiver board which draws about 1/4 amp when being used, and
I imagine that's close to what yours is taking.
-Adam
jeff dezur wrote:
>
> well, the company that makes the GPS sells one for about $25, but I was
> hoping that I could make one for a fraction of the cost. They also have an
> adaptor that works off the keyboard/mouse port of the laptop also. would
> that possibly give off more power than the serial port?
>
> -jeff
>
> ----- Original Message -----
> From: Nick <zaphod@gis.net>
> To: <ti-hardware@lists.ticalc.org>
> Sent: Thursday, August 19, 1999 5:53 PM
> Subject: Re: TI-H: New topic, since the list has been dead.
>
> >
> > Get a power adapter for AC voltage or build your own with a 723. Not near
> > enough power to drive anything but LED's coming out of a serial port, and
> > it's not really regulated well at all. If it's sucking your 4 AAA's dry,
> > it's taking way too much power to be driven by the miniscule current a
> > serial port puts out.
> >
> > Get a 6v lantern battery & clip the wires to the battery springs. Wear it
> > on your belt. That ought to get you a couple days of power at least ;)
> >
> > --nick
> >
> > Nick Foster / Bistromath / zaphod@gis.net
> > KeyID 2048/1024 0x663CB446
> > 6CAF FFD4 F9BA 64BA ECF9 032E 7402 3886 663C B446
> >
> >
> > ----- Original Message -----
> > From: jeff dezur <jeffd@wwnet.net>
> > To: <ti-hardware@lists.ticalc.org>
> > Sent: Thursday, August 19, 1999 5:00 AM
> > Subject: TI-H: New topic, since the list has been dead.
> >
> >
> > >
> > > I picked up a GPS reciever the other day, one that interfaces into the
> > > serial port of my laptop, and sends the info across that. well, it only
> > > lasts a little while on the batteries (4 AAA, which, not to my surprise,
> > are
> > > expensive... compared to others)... I popped it open, and of course,
> > there's
> > > not much in it, but, what I was wanting to know, is there a way, for me
> to
> > > set a signal high on the serial port, so I could get the required +5-6V
> > that
> > > it needs for power? I was reading around, and the serial port, according
> > to
> > > a few websites, gives off a +3-25V... which either will cause the GPS to
> > not
> > > do anything(lack of power) or fry in a cloud of smoke (25V), and end up
> in
> > > me blubbering over the $150 I spent for it... Since there's not an
> extreme
> > > amount of room, definitly not enough for a +5 voltage regulator, unless
> > it's
> > > surface mount, any ideas on how I could get it to work?
> > >
> > > -jeff
> > > jeffd@wwnet.net
> > >
> > >
> > >
> > >
> >
> >
Follow-Ups:
References: