USB power breakout - PCB (6HP)
- This PCB is for a power breakout only - there is no provision for data passthrough. You could probably hack your way around this if necessary, but if you do you're on your own.
- This is a surface-mount build - with the exception of an SOIC op-amp and a couple of through-hole capacitors, the components are 1206-sized. These are easy to hand-solder and a lot quicker than through-hole components.
A PCB for a 4-way USB power breakout - it seems that these are a Thing nowadays, and I won't deny that I've found it an extremely useful addition to my setup given all the USB-powered odds and sods that I have lying around (a USB lamp, in particular!)
Each output is switchable, with a power LED, and there's also provision for inline fuses on the USB power rail - fuse rating is a matter of individual choice but I generally use 100mA, which is sufficient for my own needs and won't overburden my case supply should I have four power-hungry peripherals attached. However, providing you've got something that'll fit into the footprint then you can use that instead.
If you don't want to use fuses then you can always use a zero-ohm link or simply bridge the F1-F4 pads - this isn't recommended, though.
The suggested USB sockets are Molex 105057-0001, but anything with a compatible footprint will work.
Per note 1, above, THIS IS A POWER BREAKOUT ONLY - there's no provision for data passthrough as the data lines would normally be terminated with a 200ohm resistor. You can work your way around this should you with, but if something goes TITSUP (Total Inability To Supply USB Power) then you're on your own. In theory, you could do all the voltage divider shenanigans that 'smart' chargers indulge in but I suspect that the result will be messy.
Basically, if it runs off dumb USB power then you should be OK running it from this. It's not possible for me to test every USB device out there, so a bit of common sense is essential too.
Because of the way the data lines are terminated, the functionality is equivalent to that of a 'dumb' charger - some recent devices which are altogether too clever for their own good (hello Apple, hello Samsung) may not work. On the other hand, it'll quite happily power various microcontroller-based devices and my Android tablet, so ....
Finally, powering this module does not require a 5V rail - power is taken from the 12V rail and regulated down to 5V; this was a conscious design choice on my part, since the 12V rails on a power supply will be rated to a higher current than the 5V rail (assuming that you actually have a 5V rail, that is)