Im building a coffee table that i wanted to have lights that would sync to the music i was playing or the games i would be playing. Did some research and found this was the best way to do (coffee table will be a later instructable).
- 1 x TIP31 NPN Transistor - Radioshack # 276-2017
- 1 x 1/8" Audio Jack - Radioshack # 274-0249
- 1 x Toggle Switch (i used a covered one because i thought it looked cool, but any will work) - Radioshack # 275-601
- Roll of LED lights (or whatever you plan to use for lights) These are the cheapest i found and they included a power supply http://www.amazon.com/gp/product/B00B0U9IAM/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
Here is video of them in action