All of my AV switching and converters are housed in a very small space - I just added a HDMI switch to the mix and dont have room to add another USB cube to power the switch. Currently I using a 2 port USB cube that outputs 2A on each port. The current draw from the existing equipment is about 250ma on each port, and the new HDMI switch draws about 250ma as well. I thought I would be able to power the new device in parallel with one of the other devices but when I try this both device dont power up. I have tried several different brand USB cubes and also the USB port on my DVD player & TV. All dont work with parrallel power to the devices even though the current draw is far below the max output of the cubes.
I tried with a more wall-warty type "transformer"/brick (5V, 750ma) and it does work so I dont think it is a current issue. Unfortunately the wall wart doesnt fit in the space I have.
Why are USB charger cubes not working and wall wart working?
I thought that it might have been that the chargers were more of a regulated 5v and wall wart was putting out a higher voltage. I measured both with no load on them and they both read 5.06v
I tried some current limiting resistors on the power of one of the devices but didnt help.
Are there some caps, diods, resistors, etc. I can used to isolate the 2 devices and get them to power from the charger cubes?
I tried with a more wall-warty type "transformer"/brick (5V, 750ma) and it does work so I dont think it is a current issue. Unfortunately the wall wart doesnt fit in the space I have.
Why are USB charger cubes not working and wall wart working?
I thought that it might have been that the chargers were more of a regulated 5v and wall wart was putting out a higher voltage. I measured both with no load on them and they both read 5.06v
I tried some current limiting resistors on the power of one of the devices but didnt help.
Are there some caps, diods, resistors, etc. I can used to isolate the 2 devices and get them to power from the charger cubes?
Last edited: