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Posted by rcbullock@no_spam.cox.net on September 15, 2005, 8:32 pm
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This isn't earth shattering or anything, but the iPaq 36xx (and I suppose
the 37xx since it's got the same connectors IIRC) AC adapter will work with
the Dell cradles. the iPaq shows a 5V output and the Dell cradle shows a
5.4V input. An 8% difference. I just tried it. :)
I'm willing to bet the iPaq 36xx/37xx AC adapters are a heck of a lot
cheaper than the Dell ones...
Also I'd also bet it's a lot easier to find an AC adapter with a center
positive 5V output than what seems to me an oddball 5.4V
Now, does anyone have an extra AC adapter for an iPaq? :) I got my X50v at a
pawn shop in perfect condition for $185 with tax, but all I got was the
cradle and Outlook 2002 CD. :( Oh well, for that price....
--
"Quality is the enemy of production."
Homepage - http://members.cox.net/rcbullock/ 'It's lamer than Spaeth's!'
** Replies to rcbullock '"AT"" cox.net ** Sorry, I detest spam.
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Posted by rcbullock@no_spam.cox.net on September 16, 2005, 10:19 am
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I also measured the actual output from the ipaq adapter and it was 5.27V.
I'm also willing to bet that an adapter rated less than 5V would work. 4.5
or so but 5V is probably the most common.
> This isn't earth shattering or anything, but the iPaq 36xx (and I suppose
> the 37xx since it's got the same connectors IIRC) AC adapter will work
> with the Dell cradles.
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Posted by Jason Donahue on September 18, 2005, 2:25 am
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>I also measured the actual output from the ipaq adapter and it was 5.27V.
>I'm also willing to bet that an adapter rated less than 5V would work. 4.5
>or so but 5V is probably the most common.
>
>> This isn't earth shattering or anything, but the iPaq 36xx (and I suppose
>> the 37xx since it's got the same connectors IIRC) AC adapter will work
>> with the Dell cradles.
>
>
Many, many moons ago, when I worked for Radioshack, I noticed that most
common AC adapters don't actually output the number of volts they're listed
at, but slightly higher. For example, a 4.5 V adapter will usually generate
anywhere from 5.1 to 5.4 volts, and 12V adapters usually actually output
13.6 volts.
The reason for this, I presume, is that an actual 1.5V alkaline battery,
such as a AA, C, or D actually has a voltage closer to 1.7 when fresh, which
gradually declines as the battery discharges. NiCad and NiMH batteries,
meanwhile, start at lower voltages (usually 1.2V), but, as I recall, have a
flatter voltage drop as they discharge.
--Jason
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Posted by Kalman Rubinson on September 18, 2005, 10:34 am
Please log in for more thread options On Sun, 18 Sep 2005 02:25:21 -0700, "Jason Donahue"
>Many, many moons ago, when I worked for Radioshack, I noticed that most
>common AC adapters don't actually output the number of volts they're listed
>at, but slightly higher. For example, a 4.5 V adapter will usually generate
>anywhere from 5.1 to 5.4 volts, and 12V adapters usually actually output
>13.6 volts.
>
>The reason for this, I presume, is that an actual 1.5V alkaline battery,
>such as a AA, C, or D actually has a voltage closer to 1.7 when fresh, which
>gradually declines as the battery discharges.
The reason for this is that the initial voltage rating is without a
load. Once these devices, batteries or power adapters, have a
functional current-drawing load on them, their voltage output is
reduced because they are unregulated. If you started with 4.5V
unloaded, you could not expect 4.5V with a load.
Kal
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Posted by Nodachi on September 18, 2005, 4:36 pm
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> On Sun, 18 Sep 2005 02:25:21 -0700, "Jason Donahue"
>
>>Many, many moons ago, when I worked for Radioshack, I noticed that most
>>common AC adapters don't actually output the number of volts they're
>>listed
>>at, but slightly higher. For example, a 4.5 V adapter will usually
>>generate
>>anywhere from 5.1 to 5.4 volts, and 12V adapters usually actually output
>>13.6 volts.
>>
>>The reason for this, I presume, is that an actual 1.5V alkaline battery,
>>such as a AA, C, or D actually has a voltage closer to 1.7 when fresh,
>>which
>>gradually declines as the battery discharges.
>
> The reason for this is that the initial voltage rating is without a
> load. Once these devices, batteries or power adapters, have a
> functional current-drawing load on them, their voltage output is
> reduced because they are unregulated. If you started with 4.5V
> unloaded, you could not expect 4.5V with a load.
>
> Kal
And that's the part I'd forgotten. Not surprising, since I haven't dealt
with this stuff much in the past 7 years. Thanks. :)
--Jason
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