Re: Tracker2 and Nuvi 350
- Sorry about the poor formatting!
--- In email@example.com, "Joe Krout" <jkrout@...> wrote:
> check my postings
> and Scott's replies.
> I don't like having to use two cables, when one should do. Also, I can hand hold the
> for typing messages, instead of having it stuck to the windshield. My modifications
> assume you are somewhat adventuresome, and halfway know what you are doing. (I
> smoked a 12v trace on the underside of the board trying to take a voltage reading with
> the multimeter set for amps! I was lucky and didn't fry anything else.)
> I have ADDED a 7805 with a 1 amp rating since the above postings. Turned out to be
> pretty simple, and no modifications to the existing board.
> Next to the RJ-45 front panel connector is a grounded mounting screw for the PC Board
> with nothing else near it. I mounted the 7805 there with a strip of heavy copper foil and
> some heat sink grease.
> Using a recycled 2 pin cable from an old PC case, I pulled +12v off the header and
> returned the +5v output from the 7805 to the output pin on the header that goes to pin
> of the DB9. The onboard +5v is left unconnected. See page 7 of the Tracker2 manual for
> picture of the header.
> I put a 0.1uf capacitor across the +5v output to ground. Grounding for the 7805 is
> achieved through the mounting tab. The three leads from the 7805 are left intact and
> connect to the circuit board except through the 2 pin cable to the header.
> I went to this corner of the board as it was uncrowded. The mounting screw nearest the
> board 78M05 is too close to the LED.
> What I ended up with is completely reversible. The 7805 running on 13.6 volts still runs
> pretty warm. I am thinking of going to a switching regulator, if I can find something
> reasonable than this. "http://www.dimensionengineering.com/DE-SW050.htm" or if I
> the time to build my own "http://www.narwani.net/neil/tech/elec/78SWxx/index.html"
> Another possibility might be using resistors to make a voltage divider, or using another
> regulator (LM7809 or LM7808) to drop the 12v input voltage.
> My standard disclaimers still apply!
> The information provided is for educational purposes only.
> I am NOT a trained professional. I did try this at home.
> No, I did not take any pictures, I already know what I look like.
> (OK, I did take some pictures, but they're blurry. I'll try again tomorrow.)
> Should you choose to attempt this proceed at your own risk.
> I will not take any responsibility for your actions.
> Good luck and have fun!