Topic: Cheap Lpc Question (Read 200 times)

animex2 · « **on:** January 20, 2004, 04:20:00 PM »

Im going to be connectiong the + Wire to the 3.3 Volt. and the - wire to the ground, But on this diagram -

The 5.0v is being used also, But i was reading somewhre that using a battery, this is not needed?

Any info on that?

veg · « **Reply #1 on:** January 20, 2004, 07:27:00 PM »

Correct - if you use batteries you will not need the 5v. I don't see a need for the 5v either way. The SST chip uses 3.3 for power and programming purposes. That diagram has you using the xbox LPC header itself for energy source. I would check the schematic that uses the regulator. Pin 3 of the regulator is the 5v Vin from the usb port. This is the only place where you would want 5v.

Personally I would use a regulator...but that's me.

networkBoy · « **Reply #2 on:** January 20, 2004, 08:12:00 PM »

if you are going to use batteries use FRESH AA cells (2 in series)
-nB

animex2 · « **Reply #3 on:** January 21, 2004, 12:00:00 PM »

alright, cool, what would the regulator be for? USB Power?

networkBoy · « **Reply #4 on:** January 22, 2004, 10:38:00 AM »

animex2 · « **Reply #5 on:** January 22, 2004, 12:28:00 PM »

how could i obtain the regulator / what does it look like?

networkBoy · « **Reply #6 on:** January 22, 2004, 06:43:00 PM »

it's an LM317T and a couple of resistors. Possibly radio shack.
-nB

animex2 · « **Reply #7 on:** January 25, 2004, 02:33:00 PM »

http://www.radioshac.....t_id=276-1778 from radio shack

With an 100 ohm resistor it would take the 5v to 3v, would it work with that and a 100 ohm resistor or what?

nleahcim · « **Reply #8 on:** January 25, 2004, 05:55:00 PM »

QUOTE (animex2 @ Jan 21 2004, 02:20 AM)

(IMG:http://pictures.xbox-scene.com/3/lpc-diag/lpc.jpg)

Im going to be connectiong the + Wire to the 3.3 Volt. and the - wire to the ground, But on this diagram -

(IMG:http://warmcat.com/milksop/cheaplpc-sch.png)

The 5.0v is being used also, But i was reading somewhre that using a battery, this is not needed?

Any info on that?

what exactly does this circuit do?

animex2 · « **Reply #9 on:** January 26, 2004, 02:47:00 AM »

make a cheap LPC programmer that uses the power from the xbox LPC (wich i find rather stupid, beacuse my xbox is sorta far away from my comp and im not buying a 20 foot paralel cable)

animex2 · « **Reply #10 on:** February 10, 2004, 04:03:00 PM »

greengiant · « **Reply #11 on:** February 11, 2004, 12:13:00 AM »

Try out this version:
http://cheaplpc.com/...ipboard-new.png

I made it after building a HUGE bunch of breadboard CheapLPC's. Little by little I optimized the design.

animex2 · « **Reply #12 on:** February 11, 2004, 02:46:00 PM »

Yea, i was going to use that Diagram i saw, but i cant make out what the little brown circle and such are x.x

networkBoy · « **Reply #13 on:** February 11, 2004, 03:17:00 PM »

greengiant · « **Reply #14 on:** February 11, 2004, 05:43:00 PM »

Be more specific. Usually a black dot means that its making contact.

The components are on the main cheaplpc website.

Author Topic: Cheap Lpc Question (Read 200 times)