I am intending to mount the PCB in the open space of the HeatSink and place a nice looking plastic cover over it. When combined with the PCB conformal coating, should give a well protected unit. That small PCB the pencil is point to is actually two PCBs that will be used to hold the NTC temperature sensors and allow for soldering to CAT-5 cables. This is a tight board, mostly because I still retained the use of through-hole parts whenever possible. But even so, there are three SMT chips on this, including the dreaded INA-220!
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