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Chip Amps Amplifiers based on integrated circuits

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Old 9th June 2003, 08:59 PM   #11
Magnetmaz is offline Magnetmaz  United States
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When you use a higher value Torroid ( like in my case, a 500VA), can you still get away with using MUR860 diodes in the bridges? Or do you have to have higher rated ones?


-Maz
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Old 9th June 2003, 09:06 PM   #12
Thomas is offline Thomas  Denmark
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Quote:
Originally posted by Olle Bard
you are using the lm3886, right?
what value do you use for the resistor on the mute-pin?
Yes, LM3886. I used a 47K mute resistor.
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Old 9th June 2003, 10:05 PM   #13
Thomas is offline Thomas  Denmark
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Quote:
Originally posted by Magnetmaz
When you use a higher value Torroid ( like in my case, a 500VA), can you still get away with using MUR860 diodes in the bridges? Or do you have to have higher rated ones?


-Maz
You still draw the same amount of current, right?

The transformer won't ruin your diodes regardless of it's potential, unless you draw a serious ammount of (startup) current from it. You can also draw verry large currents, short term, from smaller transformers.

Unless you have large capacitor banks, the diode rating should only follow the load current (and some safety margin). If you use large caps, like in class-A designs, you may have to compensate for a large inrush current.

I use a single 50A bridge for all 6 channels (when done). But GC's don't have much inrush current, so this is almost as ridiculous as 2KVA toroids.
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Old 10th June 2003, 12:52 PM   #14
mr_ro_co is offline mr_ro_co  United States
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Very nice! Clean!

Steve
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Old 10th June 2003, 10:13 PM   #15
Olle Bard is offline Olle Bard  Sweden
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ok, thanks
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