I have a Western Electric C4A ringer from an old phone. It has a coil with two windings.
From what I have read about this ringer and confirmed with resistance measurements the two windings do not have the same number of turns.
I can tell which sets of the four leads go to each winding but I can't determine the directions of the windings.
It is reccommended to put the two windings in series and, obviously, I would want them to work in tandem.
To figure this out I thought I would put an AC voltage on one winding and on my scope check the voltage induced on the other winding.
Is it correct that the secondary voltage will be out of phase with the primary voltage if I have measured the output across the secondary with the secondary windings wound the same direction as the primary windings?
I guess an alternate method would be to just try the two possible connections and see which makes the ringer louder.