Does not correspond to specifications for USB chargers

Does not correspond to specifications for USB chargers

mumbi Universal USB Power Supply 220V black 1000mAh charger 5V 1A 100-240 volts (Electronics)

Customer Review

Let me mention that this power supply, as far as I could check it, USB device successfully loads:
invites HTC Desire HD or Samsung Galaxy SII
is not very warm when charging
are the usual, well-known of switching power supplies, high-frequency, soft beeps to (barely audible)

However, now comes the big but, since the power supply does not meet the specifications for USB chargers. This stipulates that in such data lines D + and D- to be short-circuited by a resistor with a maximum of 200 ohms. At this condition namely recognizes a connected device that is attached to a power supply and must not pull to one computer, thus more than the usual maximum 500 mA. Since this power supply the data lines, however, are open to a standards compliant device with a maximum of 500 mA load, although the power supply 1 A could provide.

The charging time is thus doubled compared to any possibility.

Therefore, I give three stars because it works, but not optimal.

Addendum of 11/04/2013:
In fact, I found out after more than a year at random in a description to build an own charger with AA batteries in a Pastillendose (Google search for Minty Boost) that old Apple devices use a different method to recognize that those at a charger hang. For this is one of the two middle pins to 2.0 V, the other pulled to 2.8 V, so that a voltage of 0.8V between the two pins. (Until recently, I've read some Apple devices even have to load completely denied with other cabling.) So I have reviewed in this charger and found precisely specified voltages. The manufacturer has therefore complied with the Apple specifications, which then results in that the Apple devices (any) function and all other at least half. Then may complain that it does not work any. (However, it may be that Apple had already erected its specifications, when there were no uniform standard USB charger. Otherwise, they would (again) responsibility to make unusable a standard.)

I then decided to convert the AC power adapter to the default. And I've also made photos to document the process. Anyone who would like to tinker a bit, and not afraid of a soldering iron, it can do as well:

1. The charging unit with a pointed object stable (I have a multimeter tip used.) Carefully pry at the gap between USB port and plastic case and cause the plastic noses ringsrum carefully. Then you can remove the cover.

2. On the printed circuit board near the USB ports can be found a resistor network (see photo). In this you have to scrape by with a sharp object, the conductor tracks in order to interrupt the connection to the two middle pins.

3. Then you can the two pins on the board with some solder shorting, or, as I have chosen it, a resistor
4. Replace the cover and tighten click.

Then my smartphone recognizes correctly that it depends on the charger and not the USB port. The charging current is then 1 A as the original charger also. An iPhone 5 is by the way still loaded after the modification. Which charging current I have not checked.

Very good choice "!" Rank: 5/5
November 14
Very nice jersey Rank: 5/5
April 11
Works 98 Rank: 4/5
October 6
Top ... except for the length Rank: 4/5
January 31
This Yardley is actually a rarity Rank: 5/5
February 11

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