[TI-H] Re: PIXpander & Stuff
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[TI-H] Re: PIXpander & Stuff
To regulate your voltages, consider a network of Zener diodes acting as
shunts. If you need help with this, you can ask me, or look it up in an
electronics textbook. You can probably Google it, too. This would use far
less power. Also, you could use three LM317 adjustable voltage regulators.
This would be even more power efficient, and the LM317 is very easy to
find. IIRC, they still sell it at Radio Shack.
--nick
On Tue, 23 Apr 2002, RanDom_ErrOr wrote:
>
> I am very interested in seeing if the PIXPander can work... i know nothing
> bout electronics ecept how to solder and how to get resistor color codes...,
> but i still want to use the damn project. Thanks for the info and could you
> possibly put up schematics & part list of the project...
>
> Thanks in Advance
> RanDom_ErrOr
>
> On Tuesday 23 April 2002 05:32 pm, you wrote:
> > Well, this is a rather late post compared to others who have made an
> > attempt, but I have gotten fairly close to getting a heavily modified
> > PIXpand design working properly. Unfortunately, it seems to be rather
> > sensitive to battery levels, especially when communicating data to the
> > TI. My last 9V just 'died' because its voltage kept dropping to 4.5V or
> > less anytime the TI pulled one of the lines to ground, maybe I need a
> > resistor there (I use 2 pins for the connection, with 18k pullup
> > resistors).
> >
> > Also, I am looking into a proper solution for those using cards that
> > require 7.2V like that ultra-mega-super-duper 96 page card that can hold
> > a good 10+MB of data across those pages. Right now I am preferring a
> > route that involves a 7.2V regulator and creating a tap line of
> > resistors from 7.2V to Ground to power the PIC and the 3.6V line to the
> > card. If someone has a better method to get 7.2V, 5V and 3.6V in the
> > same circuit, tell me, as the tap method drains quite a bit of
> > electricity, and the regulator is bad enough.
> >
> > I can talk to my TI-86 just fine while running of a AC->9V DC converter
> > right now, and the PSX card I use for testing is still a little flakey,
> > but I think I have a working PSX communication method within my grasp.
> > (Talking at the full 250Khz too, which Sami's version doesn't do)
>
>
References: