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Old 25th July 2007, 02:03 AM   #1
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Question coil current rating for this amp

This is a current dumping amp,wonder what the require value for the carrying current rating of the 2 uH coil????
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Old 26th July 2007, 02:16 AM   #2
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Since the current through the speaker must also pass through the inductor, using Ohm's law, 100 watts into 4 ohms is 5 amps. Therefore the inductor should be able to handle 5 amps of current. In reality, you may be able to use a lower rated inductor because you won't be running it at 100 watts all the time. I'd guess a 3 amp rated inductor would be sufficient for most uses. A 3 amp inductor will allow 36 watts continuous at the speaker. It would depend upon your actual use though. Hope this helps.

sherlock
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Old 26th July 2007, 02:30 AM   #3
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Hi sherlock,
Figure on the peak current and allowable temperature rise in the coil. All coil charts are based on temperature rise.

Now, in this design the resistance may be important. The coil is part of a bridge circuit and represents part of the basis on how it works. Therefore, no iron allowed here. I imagine there will be a fair amount of swinging current here and you don't want resistive losses.

Of course, one is allowed to experiment. I haven't read the article Leolabs. Don't they give you ant more information on the coil? If not, look at some Quad schematics and parts lists.

-Chris
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Old 26th July 2007, 07:34 AM   #4
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Hi,
the comprehensive QUAD documentations and discussions may help.


I wonder why the CFP is configured for voltage gain in these amps.
Does the current dumping principle require it?
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Old 27th July 2007, 02:52 AM   #5
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Thank you guys for the suggestions.But the original Quad is using NPN power transistors only as opposite to this design which use NPN/PNP configurations,wonder the working principle is still the same???
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Old 27th July 2007, 03:44 AM   #6
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Hi Leolabs,
Quote:
But the original Quad is using NPN power transistors only as opposite to this design which use NPN/PNP configurations,wonder the working principle is still the same???
I think so. The bridge is the key, how the other mechanics are put together shouldn't matter.

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Old 27th July 2007, 01:55 PM   #7
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Leolabs,

Quote:
wonder the working principle is still the same???
YES, you should definitely look at the more recent QUAD modifications and - after a careful consideration - make your choice.

http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html
http://www.dc-daylight.ltd.uk/Valve-...DCD-Mod-3..pdf

I am just interested in some theoretical details.
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Old 7th August 2007, 02:12 AM   #8
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And one more question:How to calculate the voltage gain of this amp???
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Old 7th August 2007, 02:24 AM   #9
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Hi Leolabs,
In the first picture in the article you posted. The gain will be determined by R1 and R2.

Standard op amp stuff.

-Chris
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Old 7th August 2007, 02:29 AM   #10
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If so,then the voltage gain is very large!
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