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I made a computer PSU into a PSU for my Gemini, similar to that of Chris. These PSU's have great Voltage regulation and bookoo I output capabilities as well as under & over voltage control.
Only difference with mine is that occasional turn on would re-set my Gemini computer, a finicky thing with power at the best of times. The cure was putting a LC filter in line with the +12V output to reduce inrush transients.
Been working a treat for the last 2 years. Oh I tired to up the V out to +14V but the controller IC was Chinese and very little data was available to change the V set and V feedback resistors.
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