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Bilge Rat
motors and controls.........
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Because the rest of the system never see's it.



As the diagram shows your phone is normal open till one lifts the hand set.

Google is your friend
Note the 2 uf capacitor in series with the bell. This is important when dealing with AC superimposed on DC. A capacitor will block DC current but will allow AC to pass.

In this case, the capacitor will cause the bell to ring when AC is applied, but it won't allow the DC to burn up the coil.
 
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