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Old 16th March 2003, 11:25 AM   #1
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Join Date: Oct 2001
Default balanced x-Preamp

This is a variation of my sym. Headphoneamp
sym. Headphone amp
used as preamp.
You could use it asym. and sym.
The output should be used balanced for best perfomance.
Not build yet, but should work.
Powerdissipation is 5W each channel. You must use
a regulated supply. Have fun.

Andreas
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Old 16th March 2003, 11:27 AM   #2
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Default forgot attachment!

Here is it.
Attached Images
File Type: jpg xpre.jpg (28.2 KB, 1327 views)
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Old 17th March 2003, 07:06 AM   #3
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Default Nobody intrested?

Seems that nobody is intrested in this design.
I will repost when prototyp is done.
Andreas
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Old 17th March 2003, 06:28 PM   #4
loovet is offline loovet  Sweden
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Join Date: Sep 2002
Location: Outside Stockholm
I do find your schematic interesting.

How about this PCB layout?

/loovet
Attached Files
File Type: zip x-preamp.zip (21.8 KB, 247 views)
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Old 17th March 2003, 06:32 PM   #5
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Default Zip file doesn`t download!

Hi loovet,
couldnīt download your file.
Andreas
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Old 17th March 2003, 06:52 PM   #6
loovet is offline loovet  Sweden
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Join Date: Sep 2002
Location: Outside Stockholm
Default Re: Zip file doesn`t download!

Quote:
Originally posted by Orgonom
Hi loovet,
couldnīt download your file.
Andreas
I can see that the file have been downloade at least 9 times.

Any one else who got the same problem?

If you still can't download the file i can e-mail you.

/loovet
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Old 17th March 2003, 07:20 PM   #7
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I got it. Thanks for your work.
But could get it only with MS Explorer and not with NS 4.7 !???

To your PCB:
Take a look at my headphoneamp from the other tread. I put the mosfets back to back. Guess why?
Andreas
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Old 17th March 2003, 07:33 PM   #8
loovet is offline loovet  Sweden
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Join Date: Sep 2002
Location: Outside Stockholm
Quote:
Originally posted by Orgonom
I got it. Thanks for your work.
But could get it only with MS Explorer and not with NS 4.7 !???

To your PCB:
Take a look at my headphoneamp from the other tread. I put the mosfets back to back. Guess why?
Andreas
The fets work more symetric if they have the same temp?

/loovet
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Old 17th March 2003, 07:49 PM   #9
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as the transductanz vary with the temp - Yes.

Andreas
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Old 27th March 2003, 02:21 PM   #10
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Join Date: May 2001
Location: Bangalore, India
Can this X-Preamp be made to work just as well with Pchannel IRF devices in place of the ZVP3306 (since I am not able to obtain them)? What are the changes that need to be incorporated? Can we have a schematic of this as well? Perhaps, this will generate more interest from everyone to couple this preamp with the Aleph-X amps.
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Sam
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