A while ago I decided to minimize our energy usage using LED lights wherever possible. Why not start in the front yard? I was using a 500 Watt supply and now use a 44 Watt supply! I looked online for Wedge Base LED Bulbs. I saw lots of fancy circuitry and weatherproof housings that were going into an enclosure on a regulated 12 Volt supply. They provided dim light and were not cheap! The cheap ones are a few dollars now. But you can make one for about 25 cents in materials. They also don't combine colors. We need to make a Wedge Base Bulb that will run comfortably on 12 Volts. This integrated circuit requires four components. In this case they will all be diodes, hehe.
So here is what you will need to have on hand:
An existing 12 Volt landscape lighting configuration, Malibu, Toro, ect.
White 5MM LEDs ($4 per 100, Ebay)
Perforated circuitboard ($4 board, Radio Shack)
18 gauge copper wire
Rosin Core Solder for electronics
Dremel Tool (possibly a coping saw)
Wire Cutting Dykes/Stripers
Small Needle Nose Pliers
Heat Dissipators (hemostats, alligator clips)
Step 1: Cut the PerfBoard
Cut the PerfBoard into strips. The strips must be the width of a Wedge Base Bulb. So mark each fourth row of perforations for cutting with a ruler and a thin Sharpie. You might want to double check your particular board with one of the Wedge Base Bulbs for width but this should be accurate. Then cut with your Dremel using an acceptable cutting attachment. I used the detachable wheel for metal. Don't forget to wear some breathing protection of some kind. A coping saw may work as well. I tried shears and wire cutting dykes with poor results as shown. When the strips are properly cut they will have three rows of perforations as pictured. Then clip each strip into sections with wire cutting dykes, or Dremel. Clip each one off at the 14th row. This will give you the right size and shape to mount 4 LEDs.