I would like to build a low-cost home UV exposure box for PCB manufacturing. Recently my attention was brought to these dirt cheap UV bulbs which are used in manicure drying lamps. I have the ballast of a 32W CFL tube which I would like to use for the task. I have a couple of questions:
- How many tubes should I use with the 32W ballast?
- How should I wire the tubes? I'm guessing in series, since the ballast is supposed to be a constant-current source; am I right?
- The ballast has 4 electrodes, but the UV tubes have only 2. I'm guessing it's because the electrodes in the UV tubes don't have to be heated. What should I do with the extra wires? Short them like this? Won't it melt the heating circuitry then?
- Will this expose the PCB adequately?