APW12 1215b fan optocoupler feedback and control circuit
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The fan powering voltage on the Bitmian apw12 1215b power supply is 12V. When the fans are running normally, it will provide feedback to the No. 2 auxiliary power chip through this optocoupler feedback circuit; in turn, the No. 2 auxiliary power chip will also control the voltage so that it supplies power to the three fans at a s voltage.
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