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DS development > 9v Emergency Charger

#104637 - DimondEdge - Sun Oct 01, 2006 1:07 am

Hello!

Recently, I downloaded Eagle, and started designing some hardware. One
of the things I designed was a 9v emergency charger. Baisicaly, you
plug in a 9v battery, and solder on [the end of] an NDS or GBA charger. Plug
it into your DS, and it should charge. Unfortunately, I havent been able to actually make it. If anyone would like to try it, I'll provide the schematic
and board files (eagle format). Also, can anyone tell me if I've made any
electrical errors? This is one of my first designs, so chances are I've made a
few.

Thanks and good luck!

P.S. I think I may try making it on a breadboard soon, but what kind of
resistor (i.e. Oams, mA, etc.) would I use to drop the current 3.8v? Thanks!

DimondEdge

Download Schematic and Board...

Last edited by DimondEdge on Sun Oct 01, 2006 2:40 am; edited 1 time in total

#104641 - tepples - Sun Oct 01, 2006 2:18 am

DimondEdge wrote:
but what kind of
resistor (i.e. Oams, mA, etc.) would I use to drop the current 3.8v? Thanks!

5V "buck" DC regulators should not be hard to find.
_________________
-- Where is he?
-- Who?
-- You know, the human.
-- I think he moved to Tilwick.

#104644 - DimondEdge - Sun Oct 01, 2006 2:41 am

tepples wrote:
DimondEdge wrote:
but what kind of
resistor (i.e. Oams, mA, etc.) would I use to drop the current 3.8v? Thanks!

5V "buck" DC regulators should not be hard to find.

Ah... I'll look at some of those, I hardly know anything about hardware.
To Wikipedia!

#104681 - omaremad - Sun Oct 01, 2006 3:20 pm

or 2 resistors in a voltage divider combination, any resitors would do as long as the resitor connected to the 9v line is 60% of both resitors.

This should drop the voltage to 5 volts.

#104696 - tepples - Sun Oct 01, 2006 5:04 pm

omaremad wrote:
or 2 resistors in a voltage divider combination, any resitors would do as long as the resitor connected to the 9v line is 60% of both resitors.

This should drop the voltage to 5 volts.

And eat almost half the battery power.
_________________
-- Where is he?
-- Who?
-- You know, the human.
-- I think he moved to Tilwick.

#104755 - omaremad - Mon Oct 02, 2006 11:52 am

instead of grounding the 4 volts you could wire it up to your flash cart.