Let's Make Robots!

many little motors, many power supply questions

Hi all,


I am new to this forum but i have stalked users of this site for sometime.

I have a project on the go that i am a little stuck on. I have come pretty far since the idea hit me many months ago but now i am at the tail end and wondering how i will power this thing.

I have been using an Arduino connected to a bunch of 595 shift registers which are then connected to 36 small dc motors via npn transistors. the motors are small mobile phone vibrating motors and i need them to run, as per datasheet, 3v @ 90ma.