| Two diodes
Actually there are four diodes total; two in series paralleled with two others in series "facing" the opposite direction. If only one diode is used in each leg then the 0.8 to 0.9 Volt (approx.) developed by zinc-to-stainless (shaft, for example) potential would cause a galvanic isolator to conduct and waste the zincs.
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"I don't think there'll be a return journey Mr. Frodo". Samwise Gamgee
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