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Old 8th July 2011, 10:38 PM   #1211
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Quote:
Originally Posted by theAnonymous1 View Post
I've been contemplating this build since it was posted, but I have one question (which might show my ignorance of this circuits operation). Is there a reason why the LM311 is powered by only +/-3V? Anything wrong with using a higher voltage?
The comparator has a finit slew rate. So higher votlage would need more time to change output stage.
Also the driven 2N5401 cannot take much higher voltage at its base.
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Old 8th July 2011, 10:43 PM   #1212
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Originally Posted by lorylaci View Post
The comparator has a finit slew rate. So higher votlage would need more time to change output stage.
Also the driven 2N5401 cannot take much higher voltage at its base.
I designed a similar amp with an LM393 comparator running off +/- 12 volts and it was fine. It was running at 250KHz ok.
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Old 8th July 2011, 11:35 PM   #1213
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Quote:
Originally Posted by lorylaci View Post
The comparator has a finit slew rate. So higher votlage would need more time to change output stage.
Also the driven 2N5401 cannot take much higher voltage at its base.
Thank you lorylaci.
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Old 9th July 2011, 12:38 PM   #1214
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Quote:
Originally Posted by nigelwright7557 View Post
I designed a similar amp with an LM393 comparator running off +/- 12 volts and it was fine. It was running at 250KHz ok.
can you share schematic
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Old 9th July 2011, 09:16 PM   #1215
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can you share schematic
Use the same components as the other design and just run the comparator off +/-12v
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Old 10th July 2011, 12:49 AM   #1216
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Quote:
Originally Posted by nigelwright7557 View Post
Use the same components as the other design and just run the comparator off +/-12v

whats the benefit compare to LM311
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Old 10th July 2011, 12:54 AM   #1217
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Originally Posted by NMOS View Post
whats the benefit compare to LM311
Probably no difference but I was just commenting that I found I could run my comparator off higher than +/- 3 volts.
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Old 10th July 2011, 01:22 PM   #1218
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I have one problem, my amp sometime starts beeping. I don´t know why. Can someone help me?
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Old 10th July 2011, 02:11 PM   #1219
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Quote:
Originally Posted by fibko View Post
I have one problem, my amp sometime starts beeping. I don´t know why. Can someone help me?
Where does the beep come from? from the speakor, or from the amp's component (like output inductor)?
Do you have two amp modules operating?

If you have two amps opereting there can be interference (mainly beacuese the two close carriers). Try plugging off the other amp module. If beep disappears then you should try to minimise interference. (filtering supply lines, ground connection redirection)

What is the swithcing freq of your supply and your amp modules?
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Old 10th July 2011, 02:24 PM   #1220
fibko is offline fibko  Slovakia
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Quote:
Originally Posted by lorylaci View Post
Where does the beep come from? from the speakor, or from the amp's component (like output inductor)?
Do you have two amp modules operating?

If you have two amps opereting there can be interference (mainly beacuese the two close carriers). Try plugging off the other amp module. If beep disappears then you should try to minimise interference. (filtering supply lines, ground connection redirection)

What is the swithcing freq of your supply and your amp modules?
Beep come from speaker. Yes I have two amps and when one plugging off then beep disappears. SMPS run at 75kHz and amp at 250Khz.
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