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A single diode acts as a half wave rectifier. That is half of the wave is cut off as the current reverses. You will see just the top half of the sine wave on a diagram.

Adding a second diode in series in theory will cut off the bottom half of the wave so giving a flat line - but in fact the two diodes have actually cut off all the current so nothing flows. Two ddiodes in paralle' won't work either as current will flow in either depending on the sirection of flow.

To get true full wave rectification a diode bridge consisting of 4 diodes should be used.

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