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Voltage variations damage?

J

jim stone

Jan 1, 1970
0
Have just received by post a 'Fone Storm' car charger for a Huawei Ascend
g300 phone. I wanted to check the specs to see if I had been sent the right
one for this phone.

On the box it says input DC 12v-24v. Output DC 4.2v - 10v. 500ma, max
750ma.

I always understood that tiny components could be damaged by even fairly
minor variations in voltage, so am surprised that the output can be stated
as 4.2v - 10v. It was very cheap only £2. Would I be safer to spend more
and get the official Huawei charger?
 
G

George Herold

Jan 1, 1970
0
Have just received by post a 'Fone Storm' car charger for a Huawei Ascend
g300 phone. I wanted to check the specs to see if I had been sent the right
one for this phone.

On the box it says input DC 12v-24v.  Output DC 4.2v - 10v.  500ma,  max
750ma.

I always understood that tiny components could be damaged by even fairly
minor variations in voltage, so am surprised that the output can be stated
as 4.2v - 10v.  It was very cheap only £2.  Would I be safer to spend more
and get the official Huawei charger?

Hi Jim, I don't know about the particular phone. But it's certainly
possible that the phone can handle a range of DC input voltages for
charging. Is there some specification for this in the phone manual?
That might give you some peace of mind.

George H.
 
J

Jasen Betts

Jan 1, 1970
0
Have just received by post a 'Fone Storm' car charger for a Huawei Ascend
g300 phone. I wanted to check the specs to see if I had been sent the right
one for this phone.

On the box it says input DC 12v-24v. Output DC 4.2v - 10v. 500ma, max
750ma.

I always understood that tiny components could be damaged by even fairly
minor variations in voltage, so am surprised that the output can be stated
as 4.2v - 10v. It was very cheap only £2. Would I be safer to spend more
and get the official Huawei charger?

some of these devices have a voltage that is configured by the customer,
eg: by selecting the right tip for the cable, (or by selecting the
right cable) or turning a selector screw...

I would want to see a similar voltage figure to that which is given
for the mains powered charger.
 
C

Cydrome Leader

Jan 1, 1970
0
In sci.electronics.basics George Herold said:
Hi Jim, I don't know about the particular phone. But it's certainly
possible that the phone can handle a range of DC input voltages for
charging. Is there some specification for this in the phone manual?
That might give you some peace of mind.

I've seend this dubious output rating of 4 to 10 or 4 to 9 volts on
generic garbage micro usb chargers off ebay.

they don't work right with many phones, in case you were curious.
 
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