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HowTo: How To Build A Parallel Port Controller Box
( Hill Robertson)
Step 14 : Mounted in Box
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| | This is a shot of the full circuit mounted in its box. Also, if you look real close at the bottom right of the image, you can see a red and black pair of wires (just below the parallel port cable). These wires go to a computer power connector which plugs into one of the PC's spare power connectors that you would normally plug into a hard drive or CDROM or whatever. These wires connect to the Vcc and Ground pins of all of the integrated circuits. This also gives a common ground reference for the IC power and the parallel port's ground.
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