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Brian Smith
01-02-2006, 10:05 AM
The Syntax and reference manual says that my bs2 can use 5-12 volt input·. Why does the board have "5-9 vdc" written next to the power input plug? Is it safe to use 12v (from a cars cigarette lighter)?

I want to use a 12v battery through this plug to power my Board of Education. I also need 4.5-5v output from the breadboard. Will I still get 5v out if I·put 12v in?

KenM
01-02-2006, 11:27 AM
Brian Smith said...
·Is it safe to use 12v (from a cars cigarette lighter)?

I want to use a 12v battery through this plug to power my Board of Education. I also need 4.5-5v output from the breadboard. Will I still get 5v out if I·put 12v in?
Yes it is safe, at least with my experience. I have numerous projects running on production and prototype vehicles for years without a problem.

Keep in mind that the vehicle 12v cig lighther port will actually be anywhere from 13.2 to 14.7 volts when the vehicle engine is running.

Your board of education has a 5 volt output, but how much current is needed for the "4.5-5v output will determine if you can use it.

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Ken

Brian Smith
01-02-2006, 11:34 AM
I am running a gps antenna that requires 5v at 65 mA.·How much current can·the BOE output, or is it a function of input current?

Sorry Im a·ME nor an EE.

Post Edited (Brian Smith) : 1/2/2006 5:08:01 AM GMT

Chris Savage
01-02-2006, 01:54 PM
Hello,

·· If you run the GPS off the Vdd terminals on the BOE above the breadboard area, these are run from the BOE regulator, which can handle almost 1 Amp (1000 mA).

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Chris Savage
Parallax Tech Support
csavage@parallax.com (mailto:csavage@parallax.com)

Brian Smith
01-02-2006, 11:54 PM
Thanks Guys!