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| The circuit consists of four parallel groups of LEDs. Each group contains four LEDs in series with a 180ohm resistor. | |
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| The toner didn't transfer very well, so, after the second attempt, I used a permanent marker to fill in the spaces where the toner didn't stick. |
For the transmission densitometry light source, I've constructed a PCB array of 16 CLM3C-MKW warm white LEDs. To create the printed circuit board, I used the printer toner heat transfer method. This involves creating a schematic using GNU Image Manipulation Program (GIMP), printing it with a laser printer on glossy magazine paper, using a hot iron to melt the toner on to the cleaned surface of a copper-clad board, dissolving the paper with water so only the toner remains on the board, and dissolving the exposed copper in a bath of etchant.
For the transmission densitometry light source, I've constructed a PCB array of 16 CLM3C-MKW warm white LEDs. To create the printed circuit board, I used the printer toner heat transfer method. This involves creating a schematic using GNU Image Manipulation Program (GIMP), printing it with a laser printer on glossy magazine paper, using a hot iron to melt the toner on to the cleaned surface of a copper-clad board, dissolving the paper with water so only the toner remains on the board, and dissolving the exposed copper in a bath of etchant. 
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