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HowTo: SSR Enclosure using extension cords
( Bill Adelsberger)
Step 3 : Circuit board considerations
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| | My SSR design is a variation of the one described in Sean Bowf's HowTo so there will be some slight difference in the PCB size and component placement. The following information should help you determine if there are any changes needed to accomodate the SSR boards that you are using.
PCB size: 2.5 inches by 2.0 inches
Height: 1.5 inches from the bottom of the PCB to the top of the heat sink
RJ45 jack: centered along the 2.5 inch side with 1/4 inch overhang
Heat sinks: two pieces - 1/2 by 3/4 aluminum channel and aluminum U-channel that is described as "trim channel for 1/4 plywood" (from Value).
I use this approach for the heat sinks to allow for a good amount of thermal mass and surface material, and to keep a fairly low profile. The SSR's are squeezed between the two pieces of aluminum and held using #6 by 1/2 inch sheet metal screws.
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