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Author Topic: Why do all pinball machines hum ?  (Read 767 times)

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Offline Retropin

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Re: Why do all pinball machines hum ?
« on: December 16, 2014, 08:55:33 PM »
The load on the transformer also plays a part which is why swapping the ballast may make a difference.. its all down to harmonics and the circuit impedance will also determine the amount of hum
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