I was bored one day. I wanted to build something cool. A quick bit of brainstorming and nothing came up. Digging through my junk boxes, I found a old level meter kit. I went over my mate's place later that day and we were having a killfest in Halo 3. He had seen this Level kit in use before, and wanted it rebuilt into a full-blown system to complement his surround system.
Here I'll guide yo on how to make your own.
Step 1: Parts
LED level meter kit (available here)
LED's of your choice.
Diodes (if using AC output supply)
10 X BC558 or similar transistors.
Step 2: Tools
Spray Paint (optional)
Step 3: Power Supply
The solution was for me to make a simple diode bridge (bridge rectifier). It uses just 4 small power diodes.
I layed them out, soldered them together, added a supply and viola! 15V unloaded. Perfect!
Step 4: Transistors!!!
This meant I needed a PNP transistor.
Enter the simple but effective BC558. Actually anything will do here. Everyone should have plenty of these in their parts drawers. If not, well, you'll need to go get some. 10, in fact.
After finding them, you'll need to cut their leads into a special shape. Not 100% necessary, but makes life easier.
See pictures for more info.
Bend the collectors to 90Â° behind them. Slot them into their respective holes and solder them in.