I did not want to spend several hundred pounds of professional equipment, hence I was happy to find the following site:
This was simple enough for me to build, made from components that are easy to get.
You need the following:
- T10 21-LED White Light Car Angle Eye (70mm Diameter) from Dealextreme
- T10 24-LED White Light Car Angel Eye (90mm Diameter) from Dealextreme
- T10 39-LED White Light Car Angel Eye (120mm Diameter) from Dealextreme
- Big Altoids peppermints box from local supermarket
- Old laptop power supply “borrowed” from work
- 3.5 mm stereo plugs and socket, 3 each. I used a socket which has screw mount, so it is easy to fit into the box.
- 2.5 mm DC socket that fits your power supply plug
- TS7812 1A 12V fixed voltage regulator
- 9V battery clips
- Adapter ring, my Canon ESO 300D has 58mm ring
- Some cable
The Altoids box is big enough to fix two 9V batteries which give enough voltage when connected in series. The voltage regulator keeps the voltage on 12V which is required for the LED rings. In most cases I would use the ring light when mains is around hence I opted for the external power supply.
The adapter ring I used to mount the ring light on is a 58-58 mm Marco Reverse Adapter Ring that I bought from this store: http://stores.ebay.com/ADPLO. This has a nice rim where I could glue the base on.
The electronic components are either Maplin or Farnell. There is nothing special about them. The voltage regulator heats up during use, especially if the “in voltage” is high. I am using an old 19.7 V laptop power supply. Just to be on the safe side I put a small heat sink on the voltage regulator. Note that in my ring light I was using the base ring of the 3.5 mm jack for ground and the outer connector of the power supply is also ground. These terminals are connected through the metal mounting screws and the box. So if your power supply has the positive outside and the negative inside it can cause short circuit.
See the video from the build: