Test/Review of goobay 44004 usb 1A

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HKJ's picture
Last seen: 2 weeks 12 hours ago
Joined: 05/24/2011 - 12:23
Posts: 7447
Location: Copenhagen, Denmark
Test/Review of goobay 44004 usb 1A
goobay 44004 usb 1A


Official specifications:
  • Mains voltage: 100-240VAC 50/60Hz
  • Output voltage: DC 5.0V
  • Output load: Max. 1000mA

I got it from av-connection.dk


I got the charger in sealed a plastic bag with the charger and a universal instruction sheet.

DSC_0189 DSC_0190


  • Power consumption when unloaded is 0.2 watt
  • USb output is coded as HP touchpad.


The charger is overload protected at 1.3A, this is a fine value for a 1A charger.


Running with 1A for one hour did not show any problems.
The temperature photos below are taken between 30 minutes and 60 minutes into the one hour test.


M1: 41,8°C, M2: 42,7°C, HS1: 58,9°C


M1: 44,2°C, HS1: 76,6°C


M1: 41,2°C, M2: 41,1°C, HS1: 54,8°C


M1: 42,2°C, HS1: 44,6°C


There is some noise with 67mV rms and 460mVpp.


Increasing the current to 1A increases the noise a bit: 90mV rms and 490mVpp.

Tear down


I needed the vice and a hammer, then it was easy to open.


On the mains input is a fusible resistor (1W 10R) and 4 diodes for a bridge rectifier.
There is a safety capacitor between mains and low volt side. The diode on the low volt side is a round diode without heatsink. That is probably the reason for the yellow stuff on the circuit board (It is usual white as can be seen where the mains wires is connected). I.e. it turned yellow due to heat.


On the other side of the circuit board is the mains switcher IC. This chip is designed to work without any opto feedback from the low volt side.

DSC_2066 DSC_2067

DSC_2068 DSC_2069

As usual the blue safety capacitor has a lot of approval markings on it.



No problem with isolation distance.

Testing with 2500 volt and 5000 volt between mains and low volt side, did not show any safety problems.


This charger is simple, but works fairly well.
I wonder about the coding on the usb output, it will probably confuse many smartphones.


Index of all tested USB power supplies/chargers
Read more about how I test USB power supplies/charger

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

MRsDNF's picture
Last seen: 3 months 2 weeks ago
Joined: 12/22/2011 - 21:18
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Location: A light beam away from the missus in the land of Aus.

Thanks HKJ for the review. The name itself made me smile.


djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.