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The silver band shows which end is the negative (Cathode) end. If you are using it as a blocking diode, the other end (+ve Anode) should be connected to the +ve supply. Power will pass through and be available at the end with the stripe. If you put it the other way around, it will block the current.

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9y ago

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Q: What does the silver band on a car electrical diode mean?
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