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OESF Forums > Distros, Development, and Model Specific Forums > Model Specific Forums > Cxx0 Hardware
ThirtyOne
I have read all the threads, but they just left me confused.

If I buy a Japanese 860, what charger should I get with it.

I want the most compatible with US power so I won't have problems down the road.
MrSquishy
http://www.oesf.org/forums/index.php?showtopic=10862

I've used both on my 760 and it didnt pop.
I feel more comfortable using the EA-72 on a US 110v line than the EA-70. After all, that is the adapter it was built for. It would seem that running the output amperage at 200% is more of cause for concern than running the input voltage at 110%. I've felt confident enough to use both and a homemade battery box.

EA-70:
Input: 110v
Output: 5v 2a

EA-72:
Input: 100v
Output: 5v 1a
kahm
Over the years I've charged my Z's with:

Sharp EA-70
Sharp EA-72
8xNiMH AA Batteries
Compaq 3600-series power adapters
5v rail of my computer power supply.

If it puts out a regulated 5v you should be okay. The batteries were rated for 4.8v, and the regulated power supplies all put out 5.0-5.3 v.

I personally prefer the EA-70 just beacuse the "brick in the middle, not at the end" makes it really easy to plug into crowded power sockets, even with the tiny size of the EA-72. Plus the 2amp rating seems to make for better charge times.
ThirtyOne
For what it is worth, the vendors i talked to recommended the ea-70.
MrSquishy
These are also the people that make their money by selling you a Japanese Zaurus with a US power supply.

They do a service to the Zaurus community no doubt, but that is how they make money.
Streamline
^^^^^ I wish that were true
TRIsoft
QUOTE(MrSquishy @ Mar 11 2005, 08:29 PM)
These are also the people that make their money by selling you a Japanese Zaurus with a US power supply.
*

There are even people (we) making money while selling battery
chargers (CE-BC21) to people who fried their chargers laugh.gif
SCNR

///TRIsoft

Marc Stephan
Streamline
Maybe we need to be smart and sell them the ea72 charger we throw away so we can sell more units smile.gif this seems logical
ThirtyOne
Well, I have a SL-5500 so I had the EA-70 already. My problem is it charged all night and the battery light never went off like it does on my 5500. Is that normal. I know on another thread some people said they had the same thing, but it wasn't consistent.

I don't have a warranty because I bought a used 760 and I don't want to end up frying it, and I already have both chargers so I can use either one.
TRIsoft
QUOTE(ThirtyOne @ Mar 11 2005, 09:46 PM)
My problem is it charged all night and the battery light never went off like it does on my 5500.  Is that normal.  I know on another thread some people said they had the same thing, but it wasn't consistent.
*

OK, serious now:

Time to charge a fully recharged battery with an EA-70:
EA-BL06 (SL-5x00, SL-C700/750) : 2-3 hrs
EA-BL08/EA-BL11 (SL-C760/860/3000): 4-5 hrs

After full charge the LED should turn off (if the device itself is off). After even
a second usage, it will charge for a few minutes until LED is off again.

If your charger LED is not turning off, there may be a problem with the ac
adaptor (we had not even one defective EA-70 while having a few
thousand in the field) or a problem with the battery / charger circuit.

You say you also have a SL-5500. Have you tried to use the EA-BL06 of
your 5500 in the SL-C model ? This could give you a hint if it's the battery
or the charger.

///TRIsoft

Marc Stephan
MrSquishy
@ TRIsoft & Streamline
I hope I didnt offend you, (I really do apprecite what you do by making Zaurus's available locally for people who need a warantee). I must have my tinfoil hat on too tight. I dont mean to classify your services as people making money by spreading FUD, but with the U and D about frying a Zaurus w/ an incorrect charger, you can see where the F comes from, right?
ThirtyOne
Well, the charger works great in my SL-5500 (I charge 3 batteries with it on a regular basis).

I also want to say I support streamlinecpus even if I couldn't buy from them because I am too cheap/poor.

Especially since they are right down the road in Atlanta. Steve, are you a Braves fan?
TRIsoft
QUOTE(ThirtyOne @ Mar 12 2005, 01:02 AM)
Well, the charger works great in my SL-5500 (I charge 3 batteries with it on a regular basis).
*

ThirtyOne,

the 1-million-$-question is: If you pull the EA-BL06 out of your SL-5500
and stick it in the C-series model: Will it charge ?
If the answer is yes: The battery in the C-series is defective
No: Welcome to the growing club of fried charger electronics.
In this case you may cut the nose off of the big battery and charge
it in your SL-5500. This will save the external battery charger.

///TRIsoft

Marc Stephan
ThirtyOne
hmm. Good point. The previous owner did not use a ea-70.

the conspiracy thickens...

Thanks for your advice. I will try it tonight.

- L
kahm
QUOTE(ThirtyOne @ Mar 12 2005, 12:55 AM)
hmm.  Good point.  The previous owner did not use a ea-70.

the conspiracy thickens...

Thanks for your advice.  I will try it tonight.

- L
*


When you were charging your Clamshell, was it on or off? My 860 never turns it's power charging light off if it is running. (Or if it does, it takes a very long time). It charges very quickly when off.

This is the stock behavior that I had for the first 2 weeks in Japan with the EA-72 adapter, so it doesn't seem to be an artifact from using the adaptor in Canada. It is a hardware thing as it doesn't matter if I use the 1 amp EA-72, 2 amp EA-70, the Sharp Rom, or Cacko. It is also the same for the second 860 my friend uses.
Streamline
Yes Thirty One I am a Braves fan smile.gif
adrian
TRISoft,
You sell SL-Cxxx in Germany with EA-70s right? Doesn't it take 110V input voltage? Are there two versions of EA-70s - one taking 110 and the other taking 220-240V?
TRIsoft
QUOTE(adrian @ Mar 12 2005, 07:43 PM)
TRISoft,
You sell SL-Cxxx in Germany with EA-70s right? Doesn't it take 110V input voltage? Are there two versions of EA-70s - one taking 110 and the other taking 220-240V?
*

We use the EA-70S type worldwide. It's easy:

EA-72: 100V japanese type, very small
EA-70S: 110-240V "world" type with "brick-in-the-middle" and changeable
ac cord.

And before the flamewar starts: Yes, it's normally no rocket science to
build a stable 5V power supply, but for some manufacturers it seems to
be laugh.gif .
We think very simple this way: SHARP EA-70S = no problems, 3rd party
adaptors = risk. That's all. The EA-70 is pretty expensive and if we would
know a trustworthy and reputated manufacturer with a cheaper one, we
would take it.

///TRIsoft

Marc Stephan
seinfield
Hi, i made my own ac-dc adaptor (because i received my zaurus c700 without a charger). I just bought an used LG celular phone charger ~ $1 dollar
I
NPUT : 110 ~ 240V (it will work at all countries tongue.gif )
Output: 5.2 V - 800mA
Made in Corea


I used an osciloscope in order to check if the output wasn´t a real DC (because some cellular chargers like nokia uses an sine wave), but the output is a real DC.
I was worry about the 0.2V more than the 5V the zaurus required, but when i connect the zaurus the voltaje drops exactly to 5.0 volts. And now i have a working zaurus charger.

For only 1 dollar + 50 cents for the zaurus connector. biggrin.gif

I can sell you some ready to use ac - dc Trisoft laugh.gif
waalkman
QUOTE(TRIsoft @ Mar 11 2005, 04:08 PM)
In this case you may cut the nose off of the big battery and charge
it in your SL-5500. This will save the external battery charger.



That's what I do (except that I made a hole in the charger to accomodate the battery rather than cut off the tab.

My internal charger works fine, but this way I don't have to plug in the Z (I have two batteries).
neuroshock
Just a note on the 1amp-2amp concern.

The fact that a given power supply is rated @ 2amps means that it can supply a TOTAL of 2amps to whatever device it is plugged up to. If the device, (in this case your C760), only "requests" 1amp to charge correctly then this is all that it uses. The power supply itself does not FORCE more amperage than the device "requests" so it is always safe to use a power supply that supplies more amperage than is needed. As a matter of fact it is good practice to use a power supply that is rated at least slightly above whatever amperage you need. (I won't go into why this is so, just trust me on this one- my posts are always long and that explanation would make this a world class read!)

Now as an important disclaimer so nobody goes and flubs their unit up, please notice I said AMPS and not VOLTAGE! It is NOT appropriate to use anything except the correct Voltage specification when choosing a power supply. Unlike the amperage issue the Power Supply WILL FORCE whatever voltage it is rated at upon your device. Gratefully most electronics devices are built to be very forgiving when dealing with voltage fluctuations and the Z's are no exception. It's why you can see ppl on the boards here using various chargers that rate up to 5.2V or so with no problems. It's also why you can use 4 alkaline 1.5v batteries in a "battery brick" without screwing up things totally. But remember- don't EVER push the voltage thing too far, and going beyond 5v for ANY reason may put your Z at risk!

As you noticed from the Trisoft and Streamline posts, they both recommend the EA-70(s) for this very reason. It is also why if you use a 2amp power supply that the charger can charge your batteries much faster than a 1amp charger. As long as the battery charger is rated at 2 amps, then it will pull a full 2amps from a power supply. Likewise if that same 2amp rated charger has only a 1amp power supply hooked to it it would LIKE to have 2amps but will make do with just 1amp...but it will take it much longer to do the job. The output AMPERAGE is not the criminal in this power supply debate.

Before anyone blasts me, YES wattage and heat dissapation do play a role here but not a fundamentally important one for the end user. A slight over simplification to anyone reading this is simply that the FASTER (more amperage used) your charger charges (like when the 2amp charger is hooked to a 2amp power supply) the more heat it will create in a shorter amount of time. Likewise if the same charger only can get 1amp from the power supply less heat is created in the same amount of time BUT either way the same amount of heat will be dissapated during the charge cycle. One just gets hotter faster. So if you pull your battery out of the charger when using a 2amp power supply- don't freak that it feels so much warmer than it did with the 1amp power supply at the end of it's cycle. When discussing the options listed in this thread heat shouldn't be an issue for you to worry about.

In closing, the major dangers of using certain power supplies are whether the OUTPUT VOLTAGE is appropriate, and the AMPERAGE is sufficient. We've discussed the Voltage issue. If you choose a charger that has INSUFFICIENT amperage, such as 0.3amp you will end up with your Zaurus never having enough amperage to fully charge the battery (and the light may never go out), or it may never charge the battery at all or even turn on.

The moral of this story for US Power Supply/Charging issues with the Clamshell line is this: Choose a Power Supply that has an output of EXACTLY 5 VOLT DC current and AT LEAST the minimum amperage of your clamshell specifies (not sure what it is on a C760, I think they're all the same but I'm not sure- it'll be written on the bottom of your device or near the DC in port).
Since the EA-70/EA-70S both put out EXACTLY 5v DC 2amp at ANY input AC 100v-240V then you are on rock solid ground here in the US.

You can buy these very inexpensively off of Ebay and various other sources around the net, as well as through TriSoft and Streamline CPU's. So if you just don't understand all the in's or out's of what all this mean just stick to the EA-70-EA-70S model power supply. If you DO understand then knock yourself out and if you brick it, or fry the charging circuit you can't blame anybody but yourself. (A dismal feeling that I have had MANY times when I talked myself into a moment of idiocy so BELIEVE me I can relate.)

Hope this helps,
-NeuroShock
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