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Can I add a small application board to a Fusion Amp and use the same power supply?
No, one cannot add anything to the Fusion Amp setup, this will void the warranty.
https://www.diyclassd.com/FAQ-Hypex/Fusion-Amp-Family/Can-I-add-a-small-application-board-to-a-Fusion-Amp-and-use-the-same-power-supply