hey guys. this is my first time making a laser. im using a Blu-Ray diode i got from my playstation 3. im pretty new at this so any suggestions on what parts i need to buy? i dont really use ebay, or buy from this site. mostly only amazon. sorry if thats a hindrence. for what i do know, im using a 9V battery, a 150 ohm resistor. also, i need a host.