Homemade exposure unit

Posted on Feb 7, 2014

Each tub sockets has 2 plastic nibs on the back. For each socket I drilled 2 holes into circuit material. Then I pressed the socket nibs into the drill holes. Finally I screwed the stripe of epoxy circuit material to the wood slat. The wiring diagram to drive 1 or 2 tubes is printed on the top of the magnetic ballasts (see picture no. 14). In my c

Homemade exposure unit
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ase every magnetic ballast is driving 2 tubes. In addition every tube needs of course its own fluorescent starter. The 4 starters in the right upper corner as well as the 2 vertically mounted magnetic ballasts are connected to the 4 top uv tubes. The 2 single starters at the right bottom as well as the horizontal mounted magnetic ballast driving the 2 lower uv tubes. To wire all parts together I used 0. 75 mm ² strand cable which I tinned at the ends. This was required as all parts had these clamp connectors (without any screws). To make the wiring look a little bit nicer I used quite some hot glue. The tubes need approx 2 seconds to ignite. You can see on the photo that one end of the tube is actually a bit brighter than the other end. However - as the board is supposed to be placed in the middle I do not expect any quality problems. Picture 6 shows actually the same but the wood was painted in black now (a bit of isopropanol and few drops of refill ink for a black Edding ® pen, as this mixture is drying very fast. Don`t forget to open the window!) The base plate will later on be covered by a white mat carton (as a kind of reflector). The side walls will stay painted in black to avoid potential light scatter. The timing device was made with a Atmel ® ATmega32 microcontroller. Picture 7 and 8 shows the prototype of the timer using an Atmel evaluation board from Pollin Elektronik ® (green board) and my own test board. My...

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