so what is the point of the bridge rectifier?

and wouldn't it half the strength of the coil since there are only half as many turns for the same cubic area as a bifilar coil



HI there , the rectifier stops the flow of currents returning to the coil when pulsing the battery and to convert ac to dc for the cap and battery. (did you notice the third winding is in opposite direction to the other two)Cap pulsing takes a long time to charge batteries and is hard to get a good balance unless you know what your doing .