#### JJBladester

Gold Member

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**1. Homework Statement**

My professor gave us a formula for the left-over output AC voltage in a half-wave rectifier. This formula was given without any calculus or explanation as to how it was obtained.

**2. Homework Equations**

[tex]V_{out(AC)}\simeq (0.385)(V_m-V_{th})[/tex]

**3. The Attempt at a Solution**

I don't know if

*V*is the peak input voltage or the peak secondary voltage (see image below). I do know that

_{m}*V*is the threshold voltage of a diode; 0.7V for Silicon and 0.3V for Germanium.

_{th}Does anybody know how this formula was obtained? I don't have any information in my textbook on it and I've read the chapters twice.