Hi all, bought a PWM kit (
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), but put in an IRF840 & a 630V .1uF cap to run a 108VDC (nom) motor with rectified/filtered line voltage (~160VDC). The motor makes a rather loud (pwm) noise when running, is this normal? Any way of quieting it down? Yes, I know I shouldn't be rectifying mains, but this is a test & I'll use a stepdown/ isolation Xformer if & when it's working well. TIA! Bart