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I am hearing a high pitched whine from the circuit boards, whats wrong?

April 26, 2017circuit hearing high pitched whine wrong

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I am hearing a high pitched whine from the circuit boards, whats wrong?

1 Answer

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This is normal and is caused by the high frequency electronic Pulse Wave Modulation circuit (PWM). The whine should stop when both transmitter controls are central (in the dead band). You can therefore use this sound to get the two trims exactly in the correct position.