# Output voltage of rectifiers

#### Derek Lim

Joined Oct 13, 2015
2
In class, my professor only went over half wave, full wave and full wave bridge rectifiers. Looking at problem #1 on the homework, I don't know how to calculate the output voltage.

#### Papabravo

Joined Feb 24, 2006
21,225
You need to show some effort in order to get some help. We don't provide answers, but guidance.

#### WBahn

Joined Mar 31, 2012
30,063
Pick one of them and show your best attempt to analyze it. We can then help you through that one and, armed with the knowledge gained, you can then attempt another. Probably after just one or two rounds you will be able to solve the rest on your own.

#### Derek Lim

Joined Oct 13, 2015
2
So for #1, would it even be considered a full wave rectifier? If it is, then the output voltage would be 0.9*Vrms. But with the 0.7V drop per diode, I'm not sure how to account for that.

#### WBahn

Joined Mar 31, 2012
30,063
How are you coming up with 0.9*Vrms?

Sketch what you expect for the waveform.

#### ISB123

Joined May 21, 2014
1,236
You are going to struggle with other circuits if you can't figure what voltage at #1 is.

I'm just going to say that Jimi Hendrix would create his effects with very similar circuit.

#### Dodgydave

Joined Jun 22, 2012
11,303
Number 2 will probably start out at 5.6V for about a couple of seconds, then puff, the zener blows, and its 12V!!! ￼

#### crutschow

Joined Mar 14, 2008
34,454
Do not try to calculate the RMS value of the waveforms.
Just trace what is happening during a single cycle of the waveform and note the voltages at the points in the cycle where the diodes conduct and where they don't.

As Dodgydave noted, several of the circuits would fail in practice, thus are bad examples.
But I think your professor wants you to assume ideal components and ignore any possible failures.