LANMU 1M USB DC 5V To DC 9V 2.1mm X 5.5mm Module Converter DC Barrel Male Connector Jack Power Cable Plug (5V To DC 9V)
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- Reliable and fast data transfer. With this cable, you can connect your power bank to router. Thus, when power cut, you can use your power bank to supply your router!
- Internet blackout solve baby, continuous power supply Artifact
- Use mobile power,charging treasure or notebook usb interface
- Drive after a power outage or optical router cat online
- Via computer USB jack to power other devices. Such as: USB lights, USB fan, Cartoon watches, radiator, 5V mini speakers, USB HUB, etc.
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Interface: USB transfer DC5.5 * 2.1MM(2.5MM) Input voltage: DC 5V Output voltage: DC 9V and 12V Max Output current: For 800mA or less application is recommended Package includes: 1 X Conversion Line
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It does work but the power output is less than advertised based on my testing with a simple resistor load. I connected this to a 60-watt 5V Anker 6-port USB power strip (which I have verified is better than 5% tolerance 5V at 2.8A on a single port) and began to take measurements.
Max power without total shutting down:
Input 4.88V at 1.94A
Output 11.28V at 652mA
Duration - 10 minutes before erratic voltage drops
Max power without shutting down:
Input 4.89V at 1.65A
Output 11.85V at 550mA
Duration - additional 15 minutes stable, immediately following max-power test
This suggests that this 12V adapter will reasonably provide continuous output at 12V around 500mA with brief surge current of 650mA, not the 800mA advertised by Amazon. It also gets a bit warm while it is running (137F on the plastic case as measured on IR thermometer). The good news is it seems to fail gracefully and "shut down" the converter (outputting about 4.5V until reset) on severe overload then "resets" if it is unplugged for a couple minutes.
I ordered the more expensive one from Kuncan for my first board, and decided to try this one on my second one, and performance appears to be the same.
It would have been a much cleaner solution if instead of a barrel connector, this cable had a 4 pin PC fan connector at the non-USB end of the cable.
To do the job, I had to purchase a separate 2.1mm x 5.5mm female barrel to 4 pin PC fan connector cable to add to this one.
It is not the added cost that bothers me, its the kludgy-ness of the complete solution
It cost me only a few bucks more to get a proper 9V plug. I am tempted to say "I don't like it but I made it work
so I guess it's OK". The guy in the store said: Barrel is 2.5 x 5.5mm NOT 2.1 x 5,5mm as it's said on Amazon.