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The job of the busboard is to distribute the voltages generated by the powersupply to the individual modules.
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It takes three or four cables from the powersupply (+12V, -12V and Ground and sometimes +5V) as input and has 2-rowed 16 pin headers (typically keyed to avoid damage by plugging stuff in the wrong way) which allow for a connection of multiple modules. Usually DIY doesn't really pay off with busboards because the box headers are too expensive.
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![busboard_click_1](/uploads/52bf1ee4fb5dbdf47b25bf8268c9e3c7/busboard_click_1.png)
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![busboard_clicks_2](/uploads/623b9ef640f2518dddd9bbaff185c072/busboard_clicks_2.jpg)
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Some busboards have a IC on board to generate the +5V from +12V. |