Hey guys, I'm a soon-to-be college freshman and a very heavy sleeper. I contacted my soon-to-be roommate, and it turns out he's a very light sleeper and is frightened by waking up to loud noises. Of course, coming from a house where I used a phone hooked to a guitar amplifier as an alarm clock, I figured I'd have to change my waking habits. I heard from my father about an alarm clock system that utilizes pillow-mounted vibrators, but that costs waaaay too much, and I'm already going to have to balance a job or two just to get by paying tuition. Besides, I don't like buying things I can build at home. So here's my situation: I have a five-volt vibrating massager that plugs into USB ports that I wanna use as a pillow-mounted vibrator in college, so I don't wake my roomie up with a fright. My phone has a 3.5mm plug that I use to connect it to the guitar amplifier. My question is: How can I build an amplifying circuit that'll power the vibrating motor enough to work with the signal from the phone (or any alarm clock signal, for that matter)? I need 5 volts to power the motor. That much I know. I haven't measured the signal from the phone, since I haven't access to a volt-meter, at the time. HELP ME PLEASE!! Thanks.