In the past, I used diy variable power supply wall-wart or maybe small DIY power with mostly 78xx linear regulator. A double-stacked 1U power supply can be installed for redundancy as well as extra power, and perhaps even an ATX power. I need a low cost high reliability power to be utilized outdoors.<br><a href=http://industrialuninterruptiblepowersupply.com/diy-bench-power-supply-with-voltage-regulator/>Diy variable power supply</a>
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