The last part we need is the control unit, which also functions as the base/mount for the light. I used a small plastic project box, available online or from RadioShack or hobby stores.



The first step is to take the hot shoe plate (I used an extra one from my Nikon) which will be used to mount the light onto the camera. Grind down any protrusions so you have a flat work surface, then line up where on the case you want to anchor it. Drill a pilot hole through both, and thread in a small screw. Most likely you'll need to file/grind down the head of the screw so that it is flush with the mount and does not scratch your flash contacts. One side note - if you grind the screw in place, do it in stages, and the heat from grinding will soften and potentially melt the plastic.



With your mount secure, its time to layout the controls and ports. I choose the sides of the box so the know and plugs would not stick towards my face, since I value my eyeballs intact. I used a 10K potentiometer with SPST switch and 2 type M power ports. I drilled the proper size holes for mounting, and then inserted the components and tightened the included mounting hardware. I also removed some mounting holes for PCB boards to allow more room for the 9V batteries. I made sure everything fit again, the started soldering the connections.



First I joined two 9V connectors together in series and heat shrinked the connection. Next I soldered those leads to the ground output of the LED panel connector and one side of the pot's switch. Next I wired the external power input's leads to the same points and the batteries. Then I took the power from the other side of the switch to the center terminal of the pot, and the then output from the proper side (check which one has growing resistance with your direction of rotation) to the positive output of the LED panel connector.



With the wiring done, I connected the batteries, screwed on the lid, and attached some velcro the control unit and the panel, so they could be joined. And then it was time to test it out!