| Author |
Message |
Michel
Guest
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 Posted:
Tue Nov 22, 2005 5:08 pm Post subject:
Garmin Etrex ext power |
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Hi !
I want to connect my Etrex to an external power source. I know it has
to be 3 V, but I have a stabilised source of 3.8 V for the backlight
of a 320*240 screen, wich will be used together with GPS. Should 3.8
V be too much for the Etrex (for rather long use : 8-10 hours
continous) ?
Much thanks ! |
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Mogens Beltoft
Guest
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| Posted:
Wed Nov 23, 2005 1:08 am Post subject:
Re: Garmin Etrex ext power |
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Michel wrote:
| Quote: | Hi !
I want to connect my Etrex to an external power source. I know it has
to be 3 V, but I have a stabilised source of 3.8 V for the backlight
of a 320*240 screen, wich will be used together with GPS. Should 3.8
V be too much for the Etrex (for rather long use : 8-10 hours
continous) ?
|
http://www.nomad.ee/micros/etrex.shtml
"eTrex needs 3V DC (specified maximum is 3.15V)"
I would not recommend trying 3.8V
A 3V DC regulator is available from an electronics store. They are
cheap, and can easily handle the conversion from 3.8V to 3V. There are
diagrams for a voltage regulator on the link above.
/Mogens |
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David Lee
Guest
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| Posted:
Wed Nov 23, 2005 1:08 am Post subject:
Re: Garmin Etrex ext power |
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"Mogens Beltoft" <mogens@rust.beltoft.dk> wrote in message
news:43838386.7090505@rust.beltoft.dk...
| Quote: | Michel wrote:
Hi !
I want to connect my Etrex to an external power source. I know it has
to be 3 V, but I have a stabilised source of 3.8 V for the backlight
of a 320*240 screen, wich will be used together with GPS. Should 3.8
V be too much for the Etrex (for rather long use : 8-10 hours
continous) ?
http://www.nomad.ee/micros/etrex.shtml
"eTrex needs 3V DC (specified maximum is 3.15V)"
I would not recommend trying 3.8V
A 3V DC regulator is available from an electronics store. They are cheap,
and can easily handle the conversion from 3.8V to 3V. There are diagrams
for a voltage regulator on the link above.
|
Some Garmin receivers have a very wide voltage tolerance (up to 12 volts)
whereas others (eg emap) are said to be fried by anything over 3.3V.
I have seen a claim that an etrex can safely accept at least 6 volts but you
would need to confirm that before risking it. Try a Google search and look
for something contributed by someone like Dale De Priest that really knows
what they are talking about.
David |
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Jeff
Guest
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| Posted:
Wed Nov 30, 2005 9:08 am Post subject:
Re: Garmin Etrex ext power |
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New lithium batteries are about 1.8V x2 = 3.6V, I assume there is a fair
margin built into the system, so would guess 3.8V would be okay, but of
course it's not my gps.
"Michel" <michel.deom.nospam@scarlet.be> wrote in message
news:C0KDQ3x5rQzLGpdn6ofqvuvAh8hl@4ax.com...
| Quote: | Hi !
I want to connect my Etrex to an external power source. I know it has
to be 3 V, but I have a stabilised source of 3.8 V for the backlight
of a 320*240 screen, wich will be used together with GPS. Should 3.8
V be too much for the Etrex (for rather long use : 8-10 hours
continous) ?
Much thanks ! |
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