I need to supply 5v to the breakout board on my CNC router and I have a question about amps.
What breakout board are you running? (Link?)
Do the specs list the current draw?
I see alot of breakout boards shipped with a USB header that supplies 5v to the board and it looks like 5v USB delivers 500ma.
The USB spec limits an individual unpowered USB connection/header to 500 mA IIRC.
Manufacturers often allow current in excess of the spec, but drawing too much can fry your motherboard.
Powered hubs can provide more amperage, but you might as well cut the USB out of the loop to preclude any possible damage to the motherboard.
3.Hack up one of those 5v cell phone wall chargers (this I have seen used in quite a few CNC builds)?
Of the three options listed, I'm leaning toward this, but you need to know how much current it will draw to make an informed decision.
Scott