Today's Message Index:
----------------------
1. 04:40 PM - 5 Volt Converter Product Review (user9253)
2. 05:54 PM - Re: 5 Volt Converter Product Review (Jared Yates)
3. 06:15 PM - Re: 5 Volt Converter Product Review (Ken Ryan)
4. 07:12 PM - Re: 5 Volt Converter Product Review (user9253)
5. 08:20 PM - Re: Re: 5 Volt Converter Product Review (Jared Yates)
Message 1
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| Subject: | 5 Volt Converter Product Review |
I purchased a 5 volt converter on eBay (Item # 152124360516) and bench tested it.
With an input of 13 VDC, I connected a load to the output that drew 4.6 amps.
The input current was 2.15 amps. The output voltage was 5.1 to 5.15 volts depending
on which meter that I used. That is within the USB standard of 4.75 to
5.25. I calculated the efficiency to be 85 percent. I could not detect any
AC ripple using both a meter and a scope. The weight is 112 grams (4 oz), Dimensions
are 59mm x 65mm x 22mm. The mounting holes are 54mm center to center.
The seller exaggerated the efficiency, so the 10 amp output rating might be exaggerated
too. Even so, this converter should be adequate for powering 2 or 3
devices.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=464454#464454
Message 2
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| Subject: | Re: 5 Volt Converter Product Review |
I just installed one that is very similar. Running two devices my ipad will
hold steady, but not charge. That's with a 5a fuse on the 12v supply, which
might be a little conservative.
On December 28, 2016 19:47:47 "user9253" <fransew@gmail.com> wrote:
>
> I purchased a 5 volt converter on eBay (Item # 152124360516) and bench
> tested it.
> With an input of 13 VDC, I connected a load to the output that drew 4.6
> amps. The input current was 2.15 amps. The output voltage was 5.1 to 5.15
> volts depending on which meter that I used. That is within the USB
> standard of 4.75 to 5.25. I calculated the efficiency to be 85 percent. I
> could not detect any AC ripple using both a meter and a scope. The weight
> is 112 grams (4 oz), Dimensions are 59mm x 65mm x 22mm. The mounting
> holes are 54mm center to center.
> The seller exaggerated the efficiency, so the 10 amp output rating might be
> exaggerated too. Even so, this converter should be adequate for powering 2
> or 3 devices.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=464454#464454
>
>
Message 3
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| Subject: | Re: 5 Volt Converter Product Review |
How many amps does it take to power a 10 inch IPad?
Sent from my Android. Sorry Steve.
On Dec 28, 2016 5:03 PM, "Jared Yates" <email@jaredyates.com> wrote:
> >
>
> I just installed one that is very similar. Running two devices my ipad
> will hold steady, but not charge. That's with a 5a fuse on the 12v supply,
> which might be a little conservative.
>
>
> On December 28, 2016 19:47:47 "user9253" <fransew@gmail.com> wrote:
>
>>
>> I purchased a 5 volt converter on eBay (Item # 152124360516) and bench
>> tested it.
>> With an input of 13 VDC, I connected a load to the output that drew 4.6
>> amps. The input current was 2.15 amps. The output voltage was 5.1 to
>> 5.15 volts depending on which meter that I used. That is within the USB
>> standard of 4.75 to 5.25. I calculated the efficiency to be 85 percent.
>> I could not detect any AC ripple using both a meter and a scope. The
>> weight is 112 grams (4 oz), Dimensions are 59mm x 65mm x 22mm. The
>> mounting holes are 54mm center to center.
>> The seller exaggerated the efficiency, so the 10 amp output rating might
>> be exaggerated too. Even so, this converter should be adequate for
>> powering 2 or 3 devices.
>>
>> --------
>> Joe Gores
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=464454#464454
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
Message 4
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| Subject: | Re: 5 Volt Converter Product Review |
Read this post about charging an iPad:
http://www.matronics.com/digest/aeroelectric-list/Digest.AeroElectric-List.2012-09-17.html#MESSAGE7
There must be voltage on USB pins 2 & 3 to signal the iPad to draw more charging
current. Use a voltage divider with no resistor less than 10K ohm. Below is
quote from the above mentioned post:
> Here's what your USB receptacle needs to provide to properly quick-charge your
iPad (for iPhones, reverse pins 2 and 3):
> Pin 1 (+V): 5V (no less; ideally ~5.2V)
> Pin 2 (D-): 2.00V
> Pin 3 (D+): 2.75V
> Pin 4: Ground
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=464458#464458
Message 5
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| Subject: | Re: 5 Volt Converter Product Review |
Good point, thanks! I believe those pins are shorted presently.
On December 28, 2016 22:18:43 "user9253" <fransew@gmail.com> wrote:
>
> Read this post about charging an iPad:
> http://www.matronics.com/digest/aeroelectric-list/Digest.AeroElectric-List.2012-09-17.html#MESSAGE7
> There must be voltage on USB pins 2 & 3 to signal the iPad to draw more
> charging current. Use a voltage divider with no resistor less than 10K
> ohm. Below is quote from the above mentioned post:
>
>> Here's what your USB receptacle needs to provide to properly quick-charge
>> your iPad (for iPhones, reverse pins 2 and 3):
>> Pin 1 (+V): 5V (no less; ideally ~5.2V)
>> Pin 2 (D-): 2.00V
>> Pin 3 (D+): 2.75V
>> Pin 4: Ground
>
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=464458#464458
>
>
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