Dc Motor Hum.....

that's what i meant..lol....just looked 1/2 way..

looking at your picture is the 90-180 switch all the way left?

No, ll the way to the right for 180VDC




FYI anyone

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Brian
 
One note: AFIK chokes are mainly used on PWM style mosfet controllers like those on treadmills. I don't think SCR units normally need them. SCR units are generally hummy but yours may be bad.
Mark S.
 
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