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Cellular forums Home > Archive > Garmin GPS > July 2007 > Joe Mehaffey GPS Product Review Questtion
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Joe Mehaffey GPS Product Review Questtion
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| L.Kotney 2007-07-23, 7:33 am |
| I have a question where I'm confused in reading the Joe Mehaffey GPS
PRoduct Review at http://gpsinformation.info/nuvi/nuvireview.html
Joe says "NuVi [has] the capability of being run from external
12volt power ... OR by a USB connection to a laptop or
other computer's USB connector (Computer must be ON to
power or charge the NuVi)."
Two things very much confuse me about Joe's statements above.
1) Is Joe saying that the nuvi can either charge or run with USB?
2) How can the nuvi both charge and run with 12 volts if USB is 5 volts?
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| Holger Issle 2007-07-23, 10:33 am |
| On Mon, 23 Jul 2007 04:50:03 -0700, "L.Kotney" wrote:
> 2) How can the nuvi both charge and run with 12 volts if USB is 5 volts?
2 connectors, one to be run by 12V car system, the other one 5V USB.
Both most likely have a converter behind to produce the internal
voltage out of the supply.
--
Ciao,
Holger (GUS-KOTAL, GUS#1100)
90-92 Honda CB400 10 Mm | 93-95 Yamaha TDM 850 26 Mm
95-97 KTM 620 LC4 13 Mm | seit 97 BMW R1100GS 50 Mm (Die Renndrecksau!)
cu @ http://www.issle.de
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| SamSez 2007-07-23, 10:33 am |
| Holger Issle <Holger@Issle.de> wrote in
news:bq89a35qjn44lli
cf87lngbs4r6va7deq1@
4ax.com:
> On Mon, 23 Jul 2007 04:50:03 -0700, "L.Kotney" wrote:
>
>
> 2 connectors, one to be run by 12V car system, the other one 5V USB.
> Both most likely have a converter behind to produce the internal
> voltage out of the supply.
Or, it comes with a lighter plug that outputs 5v...
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| Mr Physics 2007-07-23, 10:33 am |
| SamSez wrote:
> Holger Issle <Holger@Issle.de> wrote in
> news:bq89a35qjn44lli
cf87lngbs4r6va7deq1@
4ax.com:
>
>
> Or, it comes with a lighter plug that outputs 5v...
The lighter plug adapter for the Nuvi 660 supplies 12 V at the unit, not
5V. So says the multimeter.
Greg
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| Don F 2007-07-23, 12:33 pm |
| "Mr Physics" < mrDOTphysicsATrogers
DOTcom> wrote in message
news:47idnYanFMN4WTn
bnZ2dnUVZ_j-dnZ2d@giganews.com...
> SamSez wrote:
> The lighter plug adapter for the Nuvi 660 supplies 12 V at the unit, not
> 5V. So says the multimeter.
> Greg
---
It may be because your multimeter presents a very high impedance which
results in essentially no current flow through the regulator circuit.
Try taking a reading with a 1K ohm resistor across the 12 volt output. or
while it is plugged into the Nuvi.
Don F
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| Holger Issle 2007-07-23, 3:33 pm |
| Hi,
[color=darkred]
> It may be because your multimeter presents a very high impedance which
> results in essentially no current flow through the regulator circuit.
It would be a very bad regulator to behave like that.
> Try taking a reading with a 1K ohm resistor across the 12 volt output. or
> while it is plugged into the Nuvi.
But make sure that resistor is at least 0,25W and be prepared that it
gets hot quickly.
--
Ciao,
Holger (GUS-KOTAL, GUS#1100)
90-92 Honda CB400 10 Mm | 93-95 Yamaha TDM 850 26 Mm
95-97 KTM 620 LC4 13 Mm | seit 97 BMW R1100GS 50 Mm (Die Renndrecksau!)
cu @ http://www.issle.de
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