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Old 24th April 2008, 04:09 PM   (permalink)
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Post Need Help! Sine Wave To Square with Comparator
Hey everyone!

I am doing a project with a pic microcontroller.

Now I just need to convert the input sine signals (frequency: 50/60 Hz) to really really good squares. When the sine signal is positive the output has to be 5V, when the sine signal is negative the output has to be 0V. I want to use a comparator (maybe lm393, lm339, lm311) but I can't figure out how to connect a comparator for my purpose. The datasheets are no help. If someone has a scheme, I'd really appreciate it, or any other help!

Thanks a lot, guys!
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Last edited by mrrmot; 24th April 2008 at 04:26 PM.
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Old 24th April 2008, 04:42 PM   (permalink)
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Originally Posted by mrrmot
Hey everyone!

I am doing a project with a pic microcontroller.

Now I just need to convert the input sine signals (frequency: 50/60 Hz) to really really good squares. When the sine signal is positive the output has to be 5V, when the sine signal is negative the output has to be 0V. I want to use a comparator (maybe lm393, lm339, lm311) but I can't figure out how to connect a comparator for my purpose. The datasheets are no help. If someone has a scheme, I'd really appreciate it, or any other help!

Thanks a lot, guys!
hi,
Where are going to connect your 50/60Hz source in order to drive the comparator input.?
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"Good enough is Perfect"

PIC tutorials:
Nigel's: www.winpicprog.co.uk/
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/
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Old 24th April 2008, 04:46 PM   (permalink)
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If you're asking about where to connect the sine signals, well that's exactly my problem. I don't know it.

I have those 2 sine signals and want to use a comparator, but don't know how to do the connection. Btw: I have a 5V and 12V DC voltage source in my system
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Old 24th April 2008, 04:58 PM   (permalink)
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Originally Posted by mrrmot
If you're asking about where to connect the sine signals, well that's exactly my problem. I don't know it.
No thats not it.

I have those 2 sine signals and want to use a comparator, but don't know how to do the connection. Btw: I have a 5V and 12V DC voltage source in my system
hi,
Its the 2 sine wave signals, ie: source and amplitude I am asking.

EDIT:
When a posting says 50/60Hz its possible its a mains application.
Is the source the local mains supply, if YES, how are you planning to reduce it to a safe level before its input to the comparator.?
If NO, is the signal in millivolts or volts..?

Its not possible to suggest a comparator circuit until we know this detail.
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Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's: www.winpicprog.co.uk/
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/
Last edited by ericgibbs; 24th April 2008 at 05:17 PM.
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Old 24th April 2008, 05:12 PM   (permalink)
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Those 2 sine signals are generated by a voltage generator. My project is supposed to work with sine singnals of any given amplitude that's smaller than 220V.
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Old 24th April 2008, 05:22 PM   (permalink)
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Quote:
Originally Posted by mrrmot
Those 2 sine signals are generated by a voltage generator. My project is supposed to work with sine singnals of any given amplitude that's smaller than 220V.
Quote:
When a posting says 50/60Hz its possible its a mains application.
Is the source the local mains supply, if YES, how are you planning to reduce it to a safe level before its input to the comparator.?
hi,
How are you planning to reduce the 220Vac to a safe level before its input to the comparator.?
Can you give more details of the project, whats it going to do.?
__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's: www.winpicprog.co.uk/
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/
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Old 24th April 2008, 05:42 PM   (permalink)
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The sine signals need to be converted to (as ideal as possible) squares. The square signals are the inputs of a XOR IC. The output of that XOR IC is connected to the pic microcontroller, which is supposed to measur the phase shift angle of the original sine signals. I've already figured out the algorithm and the software. I just need those squares now.
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Old 24th April 2008, 05:55 PM   (permalink)
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Quote:
Originally Posted by mrrmot
The sine signals need to be converted to (as ideal as possible) squares. The square signals are the inputs of a XOR IC. The output of that XOR IC is connected to the pic microcontroller, which is supposed to measur the phase shift angle of the original sine signals. I've already figured out the algorithm and the software. I just need those squares now.
hi mrrmot,
I am trying to help, but you are not answering my questions.

How are you planning to reduce the 220Vac to a safe level before its input to the comparator.?

Do you have a mains step down transformer from 220Vac down to, say 6 or 12Vac.?

The processing of the square wave output has been solved by you OK.
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Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's: www.winpicprog.co.uk/
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/
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Old 24th April 2008, 06:28 PM   (permalink)
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I am very thankful for your help. Sorry, I forgot to answer yor question. Yes, I'll be using a transformator, but my teacher hasn't told me to what voltage yet. I guess it'll be 220Vac-5Vac or 220Vac-12Vac. So how to do the comparator part?
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Old 24th April 2008, 06:36 PM   (permalink)
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Quote:
Originally Posted by mrrmot
I am very thankful for your help. Sorry, I forgot to answer yor question. Yes, I'll be using a transformator, but my teacher hasn't told me to what voltage yet. I guess it'll be 220Vac-5Vac or 220Vac-12Vac. So how to do the comparator part?
No problem,

I'll draw up a LM393 comparator circuit and post it.
If you are using TTL or LS, a +5v output from the comparator would be compatable, this 5V level would also make it suitable for the PIC.

Its late evening in the UK, so I'll post tomorrow.
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Eric
"Good enough is Perfect"

PIC tutorials:
Nigel's: www.winpicprog.co.uk/
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/
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Old 24th April 2008, 06:44 PM   (permalink)
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I know that it is evening, I'm from Europe as well Thanks a lot for the help, I really appreciate it. Btw: Do you know where I can simulate the comparator circuit? I usually work with Proteus, but it doesn't have the LM393 simulation model

Thanks for everything
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Old 24th April 2008, 07:17 PM   (permalink)
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Hi Mrrmot,

Here is something you can work with, it was only a simulation
but it's close to the real thing.

http://www.edaboard.com/files-eboard...ector_1511.gif

on1aag.
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Old 24th April 2008, 08:04 PM   (permalink)
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Tnx for the tip, on1aag! Which programm is this?
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Old 24th April 2008, 08:43 PM   (permalink)
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on1aag is a jewel in the roughon1aag is a jewel in the rough
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Hi Mrrmot,

It's LTspice/switchercad from Linear Technology.
You can download it here:

http://www.linear.com/

And it's a free ride !

on1aag.
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Old 24th April 2008, 09:57 PM   (permalink)
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Tnx for the tip. I'll check it out right now!
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