This particular version is switchable between 1, 2 or 3 lights. The parts list, as I made it, is as follows:
1 x Red 10mm clear LED ($0.90 AUD)
1 x Green 10mm clear LED ($2.70 AUD)
1 x Blue 10mm clear LED ($2.60 AUD)
1 x 180 ohm resistor ($0.38 AUD 8pack)
1 x 240 ohm resistor ($0.38 AUD 8pack)
1 x 150 ohm resistor ($0.38 AUD 8pack)
2 x diodes ($0.38 AUD 4pack)
1 x 9v battery ($5.65 AUD)
1 x 9v battery snap ($0.29 AUD)
1 x single pole sealed rotary switch (set to 4 position) ($2.95)
1 x Clear glass jar (I used an old coffee jar)
1 x Empty aluminium can
Broken glass (How much is needed will depend on the size of he jar)
0.12mm wire (To connect everything. USE A LIGHT INSULATION COLOUR)
Circuit diagram below is what I drew up after a brief discussion with the guys at work. (Thanks also to the guys at Jaycar for giving me a crash course in resistors)
Step 1: Assemble the Wiring
Assemble the components as per the wiring diagram below. Bear in mind that the LEDs will be inserted at different levels. So varying lengths of wire may be needed.
Initially I made all the lengths the same, which was the total height of the jar. so any every LED is the same distance away from the switch when held up. This allows for any LED to be at any level but causes some minor problems with the slack being pushed up into the lid.
Step 2: Getting the Jar Ready
First up cut the aluminium can up so as to give a single flat piece of aluminium. If no aluminium can is available, aluminium foil could be used.
Place to jar on top on the aluminium and trace around the base, then cut out the circle of aluminium. Insert the aluminium disc inside the jar shiny side up.
This should help reflect light from the bottom LED. Not much good it shining right into the ground.
Drill the holes in the lid of the jar to mount the rotary switch in. Bear in mind that 2 holes are needed. one for the shaft and another for a locking pin to stop the switch spinning.
Depending on the type of lid, attaching the wiring harness to the lid may be possible. It really comes down to how much slack is in the wiring harness and what type of lid the jar has.
Step 3: Pack the Jar
First place a small amount of broken glass in the bottom of the jar over the reflector. Insert the first LED on top and use a dowel to hold it in position while packing more glass over the top. The glass should start holding it in position fairly quickly so the dowel can be removed.
Make a gap with the broken glass, how big will depend on the size of the jar, and insert the second LED. Repeat the process with the dowel and glass covering.
Once again leave a gap and inser the last LED. This final one should only require a light covering of glass.
Remember that there will be a battery and the base of the switch that will require room. I packed the glass a small amount at a time checking the space left for the battery and switch in between.