Depends on the schematic. Unless I am missing something I need more to work from.

Ron

 

View attachment 236324

In a half-wave rectifier there is only one diode and it conducts for one-half of the AC cycle. In a full-wave rectifier there are two diodes. One of them conducts on the positive half cycle and the other conducts on the negative half cycle.

 

Is this homework?

 

In a full-wave rectifier there are two diodes.

Or four in a bridge configuration.

 

Is this homework?

Yes, i need to make a presentation and I dont find anything about the second diode. There is nothing on the internet for a half have rectifier with 2 diodes.

 

Hello,

Without a schematic we can not comment on your question.
A half-wave rectifier usualy has one diode.
See the attached PDF for more info.

Bertus

 

Yes, i need to make a presentation and I dont find anything about the second diode. There is nothing on the internet for a half have rectifier with 2 diodes.

There is a conflict between your description of what you want to build and the materials you are using. You still have not provided a schematic diagram, so we have no possible way to help you. Provide the diagram or accept your fate. Those are your choices as I see them.

 

There is a conflict between your description of what you want to build and the materials you are using. You still have not provided a schematic diagram, so we have no possible way to help you. Provide the diagram or accept your fate. Those are your choices as I see them.

I dont have a diagram, it's my job to make one .

 

I dont have a diagram, it's my job to make one .

I see. Then you should start by finding a diagram that is a half-wave rectifier with a single diode, spend some time to understand it. If you want to add a second diode, the most productive way to do that would be to add that diode in such a way that you make a full-wave rectifier. Anything else you do will just be foolish nonsense.

 

I see. Then you should start by finding a diagram that is a half-wave rectifier with a single diode, spend some time to understand it. If you want to add a second diode, the most productive way to do that would be to add that diode in such a way that you make a full-wave rectifier. Anything else you do will just be foolish nonsense.

My teacher just gave the diagram

 

That's not a standard half-wave power rectifier, it's a small-signal, half-wave precision rectifier, which is an entirely different animal.
If you Google that, you will find some info on it.
Since this is homework help, not homework do, you need to show us your attempt at answering the questions.

 

This is a different animal entirely. It is not a power conversion circuit as would be the case for a Half-Wave rectifier. Since it involves an operational amplifier, it has a different purpose. I believe this is known as a Precision Half-Wave rectifier.

Words are NOT an appropriate method of communication when it comes to circuits. You should take this valuable lesson to heart and never rely on words alone to convey information about a circuit. If you have a means of simulating the circuit, that would be the best way to examine the operation.

Back to you original question. Do you understand anything about the operation of any of the components?

Here is a simulation of what it does. In order to understand this circuit you must understand what the opamp is doing. Do you?

See Post #15 for a screen clip of a revised circuit and the results of simulation

 

Here is a simulation of what it does.

The TS's circuit has a higher value feedback resistor, so the output voltage will be different.

 

The TS's circuit has a higher value feedback resistor, so the output voltage will be different.

You're right I looked at his schematic and, since 40K is not a standard value, my brain just blew past it. My bad!
EDIT: I also upped the power supply voltage to avoid the distortion of getting too close to the positive rail with a gain of 4.

 

My teacher just gave the diagram

Ok so you have to analyze that circuit now?

 

I asked if you knew what the purpose of the operational amplifier was. If you don't, that's OK we can help with that.

 

I asked if you knew what the purpose of the operational amplifier was. If you don't, that's OK we can help with that.

After i did my research about this type of circuit, i learned that we add the second diode to prevent the the op-amp going in negative saturation(in my schematic) if i am correct .

 

I also found out if the diode 2 is forward bias then Vout = -R2/R1* Vin

 

This is my presentation about it.If you have anything to add please tell me. I dont know if I covered all the points (shematic, operation, the purpose of diodes D1 and D2, mathematical relationship, positive and negative output voltage, timing diagram. shematic, operation, the purpose of diodes D1 and D2, mathematical relationship, positive and negative output voltage, timing diagram).