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Reply to "Frank Ellison and the Mallory 1-B-8-C-1 rectifier as E-unit for DC operation"

For the record books, the bridge circuit is the time honored way to get universal motors to reverse with applied DC polarity. There is another way I used for a short time that works just as well. A DPDT relay which activates only on applied negative DC (diode in series with the relay coil) and which the contacts reverse the field/armature connections. The bridge circuit is neater.

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