Here is a simple LED mirror ball project that can be completed in less that an hour and should not cost much money. My daughter is getting interested in electronics and she wanted to make something for her room.
Parts Used:
- Mirror Ball from the dollar store
- Various Colored LEDs
- Resistors to current limit LEDs
- Wire
- Wire connectors
- Heat shrink
- Transformer
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Steps:
- Cut some lengths of wire that will connect to the hanging LEDs.
- Strip the ends of the wire and solder on LEDs, heat shrink one connection to prevent shorting.
- Use wire connectors and resistors to connect the LED wires together.
- Run a long wire from the plug-in transformer to the lights (install switch if desired)
- Watch your son or daughter smile when you turn it on and kill the lights. 
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June 22nd, 2006
great kids project dude here is just s thought that would make it a lot kooler since your already useing low voltage to run the led’s add a small motor with a 1k ohm resister to slow it down to slow spin the disco ball and get some small funnels and glue alluminum foil on the inside incert the led’s through the spout anyou’ll get better light projection and be able to hide the wires better i bet your daughter will love it even more with theese little additions hope you like it
June 22nd, 2006
Adding a motor is a good idea, currently she just gives it a spin whenever she wants the effect. She uses it as a night light quite often.
December 28th, 2006
[...] Check out this disco ball, it is powered by a CD player motor. Similar to this one, but spins by itself. “Here is my version of the LED Disco Ball. Its Completely portable can either be hung or screwed to the roof. It runs on 3AA batteries and has a group of gears from a CD player laser. [...]
June 28th, 2007
That kid is going to grow up to be a party girl. Great idea and I bet there is a market for this kind of stuff.
January 2nd, 2009
[...] DIY LED Mirror BallA disco mirror ball is a must-have for a New Year’s Eve party. What else will you point your upraised hand toward when “Stayin’ Alive” comes on? But ordinary mirror balls are so … ordinary. Buy a mirror ball and soup it up with some LED to make your party even more disco-licious. [...]
January 4th, 2009
[...] DIY Mirror Ball LED Lights - Hacked Gadgets - DIY Tech Blog [...]
May 20th, 2009
http://www.instructables.com/id/CD-disco/