Rustic Engineering

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Archive for November 2007

MP4 Powerpack – LiPoly Charger Hack – Part 2 (and final)!

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In this post, i show that in many cases, the solution is just a simple change, without any new circuit. I was surprised with the solution… and maybe you be too. The circuit of the power and charger stay above, end the first thing that pay attention is that the diode arrange in the first stage has a function of isolate the USB power and the wall adapter power.

MP4 Power Circuit

Then, I put a jumper between the pins of D202 diode and test it…..Shazam! Worked!

MP4 green wire hack

Now, see the MP4 sign charge:

Final test with USB - Shazam!

The one issue is that’s not possible to connect both USB and DC wall adapter, because now, we have a direct connection between it’s. Maybe in the version 2.0 of the hack, i really change the MP4 circuit to fix it 🙂

For now, the solution it’s OK!

Written by forrequi

November 20, 2007 at 12:29

Posted in electronic, hack's

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Obstacle detection circuit

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In any robot design, obstacle avoidance is a very important part of design. I was planning to make my own sumo robot, and i think that the object (or oponent) perception can be done with the fabulous LM567C – Tone Decoder. The circuit can be seen below:

circuit

The circuit worked perfectly in my breadboard. Over the next few days I will make a pcb. See it:

Object detection circuit

Written by forrequi

November 19, 2007 at 00:22

Posted in electronic

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MP4 Powerpack – LiPoly Charger Hack – Part 1!

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In my last travel to SĂŁo Paulo, i bought a MP4. It’s a “MP4 with 1GB internal flash, SD expansion slot, Aux. Input and… FM radio“.

It’s a great gadget, and now it’s my iPod best friend. The only issue is that the USB mini B port in the back is for data access only. Don’t charge the battery !!! Bad design, bad…

I don’t understand why the hell they make a device like it without this primary feature, but i understand that it’s a great opportunity to hack it!

Let’s dissect it:

Inside MP4

And now, a amputation:

Secundary board

First items to highligh:

  • 1700mAh Polymer Lithium Ion Battery (LiPoly);
  • TPS61032 Boost Converter;
  • TPA2008D2 Stereo Audio Amplifier;

The next step (Party 2) is obtain the schematic from the board.

Enjoy!

Written by forrequi

November 13, 2007 at 13:03

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