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What is the formula for Vdc of a Center tapped full wave rectifier?

Is it

0.636*Vac - Vk (where Vk is the potential drop across a single diode. Assume both diodes have the same cutoff voltage)

or is it

0.636*Vac - 2Vk

It's not given anywhere in my textbook and I couldn't find it on the internet either. Logically the first one makes more sense to me because for every half-cycle, input voltage is across just one diode unlike in a full wave bridge rectifier where the input voltage is across two diodes.

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1 Answer 1

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2*Vsecondary/Pi - Vk or as you put it 0.636*Vac - Vk.

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