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Old 10th June 2006, 03:45 PM   #1
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Default hafler 9505 circuit here!

feast your eyes!!

Click the image to open in full size.


someone tell me how to get this a good size to view please? thanks
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Old 10th June 2006, 04:42 PM   #2
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Old 10th June 2006, 09:59 PM   #3
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Old 11th June 2006, 09:15 AM   #4
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The 915 has the same second voltage amp, bias, and output stage.

http://k-amps.8m.com/cgi-bin/i/Power...afler_915c.jpg
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Old 11th June 2006, 10:11 AM   #5
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Your link leads to another page than you might have intended.
At least here.

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Old 11th June 2006, 11:02 AM   #6
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yes correct, the 1st stage is slightly different in that it has a cascode as well, and the fet current source is now bipolar, also the 9505 has a full current mirror.

But that's about it, they seem pretty idential after the 1st stage!!

Anyone know what the function of the 22pf cap. is from the output stage gate to the psu? someone said its not stability comp. but noise?

any guesses?
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Old 11th June 2006, 11:26 AM   #7
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The grounded output stage may be more susceptible to power supply noise coupling from the primary of the transformer than the usual method. This cap (and the 47pF on the other half) may play a role there, but it looks mainly for stability to me.

Don't know why the photo is not viewable for all. If your security is high it may not like the cookies and pop-ups. You could try going to the main site:

http://k-amps.8m.com

and then adding this to the address and then hit enter:

/cgi-bin/i/PowerAmps/Semicond/hafler_915c.jpg
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Old 11th June 2006, 03:22 PM   #8
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Hi, LT CDR DATA

Your schematic in post#1 is so small, I couldn't see anything
But if I'm not mistaken (looking at it ), it is actually the first stage that makes it different than Hafler 915. It is not the differential itself that drives the second stage, but actually the drop of the diodes+cascodes that drives the second stage.
Look at patent #5,673,000
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