Debugging a SA 90.4 800W class-D audio amplifier
Beware of ultrasonic glitches on the DAC output.
Requires extreme slewrate to track, and serves as constant impulses that may trigger ringing internal to the amplifier and the combined amplifier_piezo load.
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How is heatsinking done? And how long are wires that bring in power?
If GROUND is shared between InputSignal, Power RETURN, and output RETURN, then inductive Kick will result.