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Originally Posted by agw_01
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Yes, Stocktake's procedure does indeed look exactly what you're looking for. Use that instead of my link.
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Makes sense the buzzing from the relays would be the PWM signal, turning them on and off very quickly.
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The PWM signal doesn't control the relay coils directly. There's a whole load of electronics in the way! 
Simon
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Sir Henry Royce.
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