[Q] Voltage testing. - General Questions and Answers

I've always been curious if anyone has ever created an app to test the mains power input to the phone. Or even if handsets have that capacity. So if the mains is outputting 240v into my charger can I test what the voltage is that's actually being output but the charger.
Basically I have a couple of chargers using Usb micro 2.0 or whatever it is, the one the Xperia Z uses. They are all unbranded and don't have any markings on such as the output voltage and hertz. So i want to find their output.
Any ideas?
And yes I can use a multimeter I know.

Kirkymole said:
I've always been curious if anyone has ever created an app to test the mains power input to the phone. Or even if handsets have that capacity. So if the mains is outputting 240v into my charger can I test what the voltage is that's actually being output but the charger.
Basically I have a couple of chargers using Usb micro 2.0 or whatever it is, the one the Xperia Z uses. They are all unbranded and don't have any markings on such as the output voltage and hertz. So i want to find their output.
Any ideas?
And yes I can use a multimeter I know.
Click to expand...
Click to collapse
You can try find on Google Play.

Just as a multi meter is the best way to get your answer, posting questions in the q&a forum and not in general is the best way to get answers to any of your questions. I have asked a moderator to move this thread for you. GL with your query.
sent from my T.A.R.T.I.S
(Time And Relative Tarts In Space)

Related

Use iPhone charger for Nexus One?

Hi guys,
since the charger of the iPhone has an USB connector, my question is if I can use that charger for the Nexus One too??
Since it supplies actually the same energy level (both can get energy from a PC USB instead), does this mean that also the charger delivers current with good specifications for the N1?
thanx in advance
exelero
How are you going to plug the iPhone 30 pin in to a micro USB? Maybe I'm not understanding you correctly.
to plug the microUSB-to-USB cable of the Nexus One into the USB socket of the iPhone charger.
moto1907 said:
How are you going to plug the iPhone 30 pin in to a micro USB? Maybe I'm not understanding you correctly.
Click to expand...
Click to collapse
I think (s)he means the mains adapter part with the USB socket in it - in which case yes it will work, you just need the right cable - which came with your N1
Looking forward to when all manufacturers standardised on micro usb, for a while I thought that mini usb was micro, so I was surprised to see that the n1 was different then I found out....
ok, now i see. Not enough coffee yet,lol
scote said:
in which case yes it will work
Click to expand...
Click to collapse
yeah, from the connection part, I know it will work. my question was more related if the iPhone charger delivers the appropriate current (tension/amperage) conditions for the N1 and, let's say, it won't burn the N1 due to a too high voltage, or mess up the battery due to an incorrect tension input.
I was just having a conversation on chargers with a friend of mine the other day and googled around on the subject on amperage/current/Ma of chargers..
I stumbled upon these posts (either here on XDA, Androidforums or other forums):
1. "The current rating on a voltage source is the maximum amount that the power
source can deliver without exceeding its saftey rating.
What this means is that if you are using some device that has a power supply
with a current rating of 500mA then its best not to use a different power
supply(at the same votlage rating) with a lower max current rating. i.e.,
anything < 500mA. Now ofcourse you might be able to get away with it but if
it burns down your house then its your fault.
A device will only pull the amount of current that it uses(assuming it is a
voltage controlled device) and this is true regardless of the current
rating(hence the saftey issues I discussed above). If a device
says(sometimes they don't) it uses 500mA then it uses 500mA. Maybe it
doesn't use 500mA all the time but the engineers have put that rating there
for a reason. Using any power supply with the right voltage and a current
rating of anything more than what the device uses is ok because the device
will only pull the current it uses.
Now, about the voltage rating: The voltage rating does not have to be exact
and different devices can tolerate different voltage ratings. The problem
usually is one of current. By increasing the voltage, say, you increase the
current the device uses and then you have changed the parameters that the
device was created with."
2. "And as far plugging your phone into a charger that outputs well over 850mA, don't worry about that either. Unlike voltage, the more amperage the merrier because the device will only take what it needs of the available resources."
3. "Moral of the story. Match the Voltage (5.1Volts) Meet or Exceed the 850mA rating. (which is .850 Amps) and you'll be fine."
4. "amps are not pushed but drawn
amps is the max the charger can provide
before it get pressured and lover the volts
you could use a 5volt 10000MegaAmp charger
and the device would only draw the amps the device
was made to draw all the rest of the amps would stay
at your electricity company
ohms law state Amps == volts / residence"
5. "amps are not pushed but drawn
ohms law state Amps == volts / residence
In other English:
P = VI, where
P = Power of device (watts) and is fixed
V = Voltage used by device (volts) and is fixed
I = Current (amps) and is decided by P/V (a fixed ratio)
So the device cannot draw more current than the fixed ratio. It may draw less current if the charger cannot supply the highest amount, but then as in one of the above posts, it simply takes longer to recharge.
With these devices, milliWatts/miliAmps are the scale, 5V is generally the fixed Potential Difference.
Used in a vehicle, the device is generally both drawing and expending energy (ie. charging and running say, GPS) simultaneously. This in/out situation when prolonged is the cause of the observed overheating with the original X1 battery."
Click to expand...
Click to collapse
Bottom line... Make sure the voltage is 5V, the amperage doesn't really matter.
thanx for your feedback.
both chargers have the same output (5V, 1A) - so I am already successfully using it.
blackberry storm also has micro-usb
hello two chargers and an extra usb-cable
To answer the OP's question...
yes it works fine. I have one in my car and charge my ipod and nexus at the same time without issue. The advanced zune car adapter also works (in case one of the 5 who own a zune are reading this ).
I have been using my old Iphone white plug -> USB adapter for almost a month now and I haven't had any issues.
I tried using the iPhone charger but it charges slow...it does not quick charge. Am I doing something wrong?
uhohhotdog said:
I tried using the iPhone charger but it charges slow...it does not quick charge. Am I doing something wrong?
Click to expand...
Click to collapse
no. If i'm up to date, and i think i am, you'll only get the 'fast charge' if you use the charger that came with your phone. the usb to usb micro chargers all charge slow
Can i use X10 mini charger (5v DC 850mA output) on nexus one by the things i read i understand that i can't but my english is not very good. Thanks
if youre talking about using the iphone usb cable on your n1, HAHAAHHAAHAHAHAH
if you mean using the usb-to-AC adaptor then yea you can use any usb cable to charge anything pretty much..

2A Car Charger for Desire

Hi Guys,
Saw this 2A car charger for HTC Desire, thought I'll post it here and ask everyone if this will work well with HTC Desire. I dont want to damage my new Desire by buying something that kills it.
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=300435508442&_trksid=p2759.l1259
Let me know your comments.
Cheers!!
Amps are not pushed to the phone from the power source,
They are pulled by the phone, from the power source.
Therefore the phone will only request what it needs, IE you cant overload it.
Voltage on the other hand will!
So to answer your question,
it will be ok.
Fon22
Fon22 said:
Amps are not pushed to the phone from the power source,
They are pulled by the phone, from the power source.
Therefore the phone will only request what it needs, IE you cant overload it.
Voltage on the other hand will!
So to answer your question,
it will be ok.
Fon22
Click to expand...
Click to collapse
Thanks Fon22. pardon my lack of knowledge , so what diff will a 700ma or 1000ma will have against 2A car charger ?? Any benefits ? or its better to buy a cheapo 2$ 700ma charger ?
WEll, it's best to get the charger that can deliver the most Amps. So if the phone needs it because you're using GPS and music and what have you - then the amps will be available instead of the phone consumes more battery than it gets from the charger.
So get the one with the biggest Amp spec - but still 12 volts
Thanks guys.
And If I am not wrong , It should work with HTC Desire as well (it is being advertised as being Touch HD)..
Cheers!
Smirge said:
So get the one with the biggest Amp spec - but still 12 volts
Click to expand...
Click to collapse
I know you're referring to the source (input) voltage, but just incase it confuses someone, you want the OUTPUT voltage of the charger to be 5V. Output voltage of 12V would almost certainly do damage as the stock charger and USB spec are at 5V +/- nominal tolerances.
Amps though, yes. Preferable to have something which can deliver at least 1A.
That is correct - the INPUT is 12V as per the car battery, but the OUTPUT should be no more than 5V - thank's for clearing that up
1A is enough.
It's another important thing to this.
I tried to explain the issue here:
http://forum.xda-developers.com/showpost.php?p=6863243&postcount=24
I hope my english is ok.
Edit:
Same info here: http://forum.xda-developers.com/showpost.php?p=6443313&postcount=18

Charging habits

This could be a very silly question so pardon my ignorance. But does it have any effect when you use a different charger than the one that comes with the phone? I have a couple of chargers ranging from Samsung Galaxy to HTC chargers. I notice too that there are different input and output values for those chargers. Anyone know about this?
Sent from my Nexus 5 using xda app-developers app
The phone will take in what it needs and nothing more.
I use three different chargers on a regular basis and the one that came with the phone is still in the box. Haha
Sent from my Nexus 5 using Tapatalk
fredddeh said:
This could be a very silly question so pardon my ignorance. But does it have any effect when you use a different charger than the one that comes with the phone? I have a couple of chargers ranging from Samsung Galaxy to HTC chargers. I notice too that there are different input and output values for those chargers. Anyone know about this?
Click to expand...
Click to collapse
Check to make sure that the output voltage is the same as what the Nexus needs. The output current, if lower, will cause slower charging. But if output current is higher, it won't cause faster charging - the phone will draw the current it needs (if the charger can provide it)
Regarding the input, I'm guessing you know this, but just in case: Make sure that the adapter/charger can be plugged into your wall outlet safely. Example: if the charger you have only accepts 110v, don't plug it into a 220/240v wall charger. If the charger will accept 110-240v, then you can plug it into either. And so on
jj14 said:
Check to make sure that the output voltage is the same as what the Nexus needs. The output current, if lower, will cause slower charging. But if output current is higher, it won't cause faster charging - the phone will draw the current it needs (if the charger can provide it)
Regarding the input, I'm guessing you know this, but just in case: Make sure that the adapter/charger can be plugged into your wall outlet safely. Example: if the charger you have only accepts 110v, don't plug it into a 220/240v wall charger. If the charger will accept 110-240v, then you can plug it into either. And so on
Click to expand...
Click to collapse
Thank you for the explanation. Does that go without saying it won't harm my device in ANY WAY right? I've googled this topic and I've seen mixed opinions so I'm really just relying on experience from N5 and/or other devices.
fredddeh said:
Thank you for the explanation. Does that go without saying it won't harm my device in ANY WAY right? I've googled this topic and I've seen mixed opinions so I'm really just relying on experience from N5 and/or other devices.
Click to expand...
Click to collapse
In which case? Using a charger that has higher current rating? It shouldn't be a problem (I've been mixing/matching chargers between all my devices - S4, N7, N5, EVO LTE, etc).
Note: Defective chargers or cables can cause problems...

Need specific Car charger if anyone can help

I'm looking for a Car charger that can fast charge the V10 and also had a 1 amp output. Has anyone seen anything like this? All the dual car chargers I have seen that offer QC 2.0 have a second port that is 2 amps. I want to charge my phone and power my electronic cigarette that gets hot when using a 2 amp output.
Thanks
Get this one. Very good. Quick charge 2.0 on one then the other slot provides 2.4amp output for universal any device and even tablet could charge off it as well.
wadamean said:
Get this one. Very good. Quick charge 2.0 on one then the other slot provides 2.4amp output for universal any device and even tablet could charge off it as well.
Click to expand...
Click to collapse
Did you read what I wrote? I specifically need one with a low amp second output as my electronic cigarette will not tolerate two amps.
robl45 said:
Did you read what I wrote? I specifically need one with a low amp second output as my electronic cigarette will not tolerate two amps.
Click to expand...
Click to collapse
Reason why I posted it, having read very well the op, I was having same issue and got this one which surprisingly works in my car.
I have the same one and it works without any problems. Perhaps you (OP) could reply in a better way instead of being snippy, he really did give you a good suggestion of what to get.
Sent from my LG-H901 using Tapatalk
wadamean said:
Get this one. Very good. Quick charge 2.0 on one then the other slot provides 2.4amp output for universal any device and even tablet could charge off it as well.
Click to expand...
Click to collapse
howdyace said:
I have the same one and it works without any problems. Perhaps you (OP) could reply in a better way instead of being snippy, he really did give you a good suggestion of what to get.
Sent from my LG-H901 using Tapatalk
Click to expand...
Click to collapse
I'm sure it does work great, but i posted because I have a specific need and was hoping someone might know of a charger that could fill that need.
You won't find one. If it has QC , it will output more then 1a.
Sent from my SM-N920T using Tapatalk
Look at Anker products, I have their "smart" charger. It adjusts to what is needed and supports quick change.
Regardless of smart or not, the device requiring the power will dictate how much amperage it draws unless charger or device is faulty up to the maximum available via the charger. Perhaps your ecig is very basic and is really meant to be used with a pc usb that doesn't supply more than 500mA and doesn't have the ic circuitry to cut and control it's own intake..
Like it has been mentioned for a charger to supply qc 2.0 it has to be rated at 1.8mA minimum, so most will be 2mA~
I spend a lot of time looking at chargers and havent seen any single that meets your requirements. I'd suggest getting a socket splitter and using two small chargers. One older 500-900mA and another qc 2.0.
get this one... 2.1 and 1A ports..
I wouldn't recommend anything but the cars port for the cig lighter.
Reason is, anything else that you plug that lighter into will be made partially out of plastic and will more than likely melt as the lighter heats up.
OP needs a lower output ( 1 Amp-500mA) to charge an electronic cigarette/vape mod and is not using the actual cigarette lighter. Honestly I would just advise that you remove the battery from your mod to charge because typically when mods fail it is either because a battery is being over-discharged (user error or mechanical short) or the IC circuitry fails causing the battery to vent. Charging your IMR batts in a dedicated charger tends to promote better daily use and overall extended life cycle. If you are still limited to keeping the battery installed in your mod while charging, is QC absolutely necessary? I personally have not ran into an issue topping off using a standard charger while driving.
EDIT: I thought the flux capacitor was a joke but looked it up and it actually fits your needs..
¯\_(ツ)_/¯

Help needed with AC Adapters - Any Electricians here?

Hello everyone,
I was hoping there might be a smart electrician on here that can help me out.
I need to verify if an AC Adapter will work for my device. The device does not have any specs on it.
The only thing I have to go by is what the old adapter says on its label.
Take a look at the two pics - old and new and let me know if the new one will work for my device.
From what I've been reading, I need to match the output of the adapter to the input of the device.
So with the outputs of both adapters being somewhat close, I wasnt sure if it would fry my device or will it work.
The plug does fit into the device. If this new one wont work, I will have to order a new one.
I would greatly appreciate it! Thanks
Old Adapter
Input: AC 100-240V, 120mA 50-60Hz
Output: DC 5.3V, 500mA - ---- +
New Adapter
Input: AC 100-240V, 120mA 50-60Hz
Output: DC 5.0V, 1.0A - ---- +
If it fits you can try it. Never heard of somethinf being fried that fitted. But from looks of it it should charge twice as fast. 500 differnce to old
djhulk2 said:
If it fits you can try it. Never heard of somethinf being fried that fitted. But from looks of it it should charge twice as fast. 500 differnce to old
Click to expand...
Click to collapse
Thanks for the reply. It adapter does fit the device.
I was worried about what you said... the Amps. Because its double what the original was.
There is no charging on this device though. it only powers it to run.
My colleague just got in and said it should work. But he's 90% sure. There is only two of these devices in the world... so I dont want to blow it!
Thanks appreciate it much!
deviouskind said:
Thanks for the reply. It adapter does fit the device.
I was worried about what you said... the Amps. Because its double what the original was.
There is no charging on this device though. it only powers it to run.
My colleague just got in and said it should work. But he's 90% sure. There is only two of these devices in the world... so I dont want to blow it!
Thanks appreciate it much!
Click to expand...
Click to collapse
To keep things safe, I went ahead and ordered a new charger.
I'm still curious to know if it would work or not. Or if it's a 50.50 chance.
Thanks a bunch!
I would be more concerned about the voltage difference than the amperage rating. A lot of electronics would probably be able to tolerate a 0.3V variance without ill effects, but that will not always be the case.
The amperage rating is not a problem, as it's just a measure of the adapter's output current capacity. The actual current it supplies is a matter of the device's demand. If the device only draws 500mA, the adapter will only supply 500mA. The fact that it could supply up to 1A won't be a problem.
As theophile2 stated, there is no need to worry about the higher current rating. The adapter is a constant voltage source and the device being charged draws the current it's been designed for. The polarity looks to the same so as long as it makes contact properly it's good.
For the voltage being 5.3V vs the standard 5V you see mostly now, I don't think there's an issue there to use 5V. I think companies would use 5.3V to account for voltage drop due to the resistance of the cable. There will always be some tolerance built in the design of a minimum 5%-10% voltage swing for normal operation. That being said, if you're not comfortable using it, I'd recommend not to and save yourself the worry especially since you already bought another.
Now that we have USB charging standards of 5V it makes sense to have the wall adapter designed the same and account for this in the circuit design. Smaller IC's nowadays are more frequently being run off 3.3V LDO regulators anyway.
Lastly what sort of device is this?? Is the Nokia charger the original charger?

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