Hi all

i got a Fairchild W005G Bridge Rectifier which has 4pins (+, - and 2 ~ pins). I have also attached the datasheet for this particular IC.

My aim is to get a full-wave rectifiied signal from a sine wave. So how should i connect the input sine wave (in terms of the IC pins) and how to i get the full-wave rectified signal that i want?

Cheers.

Attached Files

Bridge Rectifier (Farnell 1017874).pdf (45.7 KB, 6 views)

 

Paul Obrien

the AC/sine wave goes to ~ pins. There is a voltage drop across the diodes(1v in specs), so you won't get a completely accurate fullwave rectification from a simple bridge rectifer. If the signal is small you may need to use an op-amp based rectifier.

 

If you want less voltage drop across a bridge rectifier you may have to build one with 4 germanium diodes which have only a voltage drop of 0.3 volts across each diode.
Otherwise you have to use an opamp too as already suggested.

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Hmm....so is it right to input the sine wave into the 2~ pins and get the wanted rectified signale from the + and - pins?

Will such a W005G bridge rectifier provide a half-wave or a full-wave rectifier?

Cheers

 

Full wave.
In your case 100 or 120 Hz with all the sine waves on one side of the nil axis.
depending weather you are in a 50 or 60 Hz country.

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Hi

hmm seems like i can only get a half-wave rectified waveform from a sine wave. I input a sine wave into the 2 ~ pins and the oscilloscop probes to the + and - pins and only managed to get a half-wave.

Can any experts help me to get the full-wave rectified waveform?

Cheers

 

So you're seeing something similar to the first waveform below?

Attached Images

full-wave.JPG (14.2 KB, 6 views)

 

Hi, Reynard,

Refer to this website for information: www.mines.edu/Academic/courses/physics/phgn215/lab3/lect6/sld005.htm

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You probably have a sine-wave generator with one of its output wires grounded. Then only half of a bridge rectifier works and the output is half-wave rectified. A Full-wave Rectifier Circuit using opamps will make full-wave rectification.

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What! - you mean he's using an earthed scope, so it won't work? - no such problems with my scopes!

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hi Mike

yup i got the 1st waveform only

 

Acutally i don't quite get what you are meant by my signal generator being grounded... I think i will be clearer if some1 can provide me a simple circuit diagram showing me how to connect up to get a full-wave rectified waveform.

Thxs in advance

 

Here's what happens when you connect your grounded generator, and grounded scope, to the bridge rectifier. Notice the dotted connection, that's the ground connection in your house between the two sockets, it shorts out the bottom left diode of the bridge.

Attached Images

scope_ground.GIF (2.8 KB, 16 views)

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Hi

thxs for all the help. I managed to get a fully rectified waveform when i use a battery power supply to operate the waveform generator. Think as long as the generator and the oscilloscope are not from the same ground, i will get the fully rectified waveform.

Cheers