Re: External power for Magellan Meridian color
- From: Jack Erbes <jackerbes@xxxxxxxxxxxx>
- Date: Sun, 03 Apr 2005 08:12:56 -0400
Norris Smith wrote:
What is the output from the Magellan external power cable? Better yet, does anyone have the schematic for the battery box on the power cable? What is the voltage range to the receiver (not through the battery box on the cable)? I think that I saw (some time ago) the output from the box was 3.8V, so perhaps the range is something like 3.4V to 4.2V.
The no-load output from three Magellan cigarette lighter power adapters I have tested was 3.8V. That was measured to three places with a good Fluke meter and rounded to the nearest 1/10th. The adapter is probably rated at about 1/2 Amp and has a 1 Amp fuse.
I asked Magellan Tech support about it when I had them on the phone once, the party line from them and on their specifications is that the input voltage is 3.3 Volts. So I would guess that it would tolerate a input voltage range typical for 3.3V solid state components.
Is it safe to use lithium AA batteries in the battery compartment?
That was another question that Magellan Tech support declined to answer for me. But the cigarette lighter adapter does not provide a charging voltage to the batteries so I would guess that using lithium batteries would work fine.
I connected a DC adapter to my 330M and tested it, there is no voltage across the battery terminals with the batteries removed. With batteries in place, there is no change in the battery voltage with the DC adapter on. If I remember right, the 330M cannot be turned on without the batteries in it and will go off if they are removed when you are on external power.
I have run my 330M with several other 3.5 to 4 Volt DC adapters (made for cell phones, PDAs, etc.) with no problems. You can find DC adapters for cell phones very cheap in surplus and junk stores and on eBay and 3.7 volt batteries are pretty common in cell phones.
Magellan is still using the same DC-DC inverter module (same size and output voltage) on the DC power adapters for the newer Meridian models. But there has been a change in the shape of the case and the connector that makes the older and newer DC adapters, which have different part numbers, not interchangeable.
Jack
-- Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net (also receiving email at jacker at midmaine.com) .
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- External power for Magellan Meridian color
- From: Norris Smith
- External power for Magellan Meridian color
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