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The cathode of a diode is usually indicated with a band.

In the absence of the band, consult the datasheet. Alternatively, use an ohmmeter that generates more than 0.7 volts at low current (a diode checker) and check conductance. The diode will conduct when the anode is more positive than the cathode.

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Q: How to identify the anode and cathode of DR 25 diode?
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