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A 120V AC signal (such as at a power socket) is a sine-wave with a peak amplitude of about 170V and -170V or 340V peak-to-peak. A half-wave rectifier is basically a single diode which will clip off one half of the cycle leaving the other with a slight reduction in voltage. A silicon diode has a forward voltage drop of about .7 (seven tenths) of a volt, so if the input signal is 170V peak (340V Peak-to-peak), the output would be about 169.3V peak.

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