I have a project that requires powering a device through a USB connector. The device is a micro wifi router, which I've found does not like any PS under 1 amp continuous. Anything below that, it starts rebooting and acting strange. I've tried it with a cell charger (rated nominal 800 mA), an mp3 charger (rated nominal 500 mA), and with both it bombed. Then I plugged in one of those apple 1.2 Amp chargers... it's been going for almost 2 weeks without a hitch.
So that got me thinking about building something with an LM7805, which is rated at around 1.5 amps. And then I thought of something, that sparked this post.
Let's say I want to power something heavier off a USB type interface. Say I have a couple of those micro wifi's running off a single supply, and need to draw 2 amps or more.
Assuming I have a DC source with enough current capacity (say I build a rectifier circuit and end up with 7V or so with a 5 amp rating)... could I wire in several LM7805's in parallel, and join the output pins together, to get a single large current 5VDC source?