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Old 30th September 2002, 10:21 AM   #101
2002tii is offline 2002tii  Norway
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I would also like to see schematics and layout to this headphone amp.
dan.m.sondeland@kitron.com
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Regards Dan M.
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Old 30th September 2002, 10:50 AM   #102
Merijn is offline Merijn  Netherlands
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Can you please mail me your ZEN-like headphone amp design? I am planning to build a headphoneamp for my Grado (32 ohms)and this could just be it!


Anyone any experiences allready? I am just too curious....

mzuijdam@hotmail.com
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Old 2nd October 2002, 12:38 PM   #103
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Hi Tortello,

I too would like a copy of the .pdf file.

dhuid@rogers.com

Thanks,
Dennis

P.S. Your headphone amp looks amazing!
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Old 3rd October 2002, 01:18 AM   #104
EJ is offline EJ
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Dear tortello,

First of all, thank you for sharing such a nice circuit with us, but I have two questions about this headphone amp.
1. Why did you use two 470uf capacitors in parellel instead of a single 1000uf capacitor?
2. Is this phone amp capable of low impedance loads such as Grado RS1 or headphones in parellel?

Thank you!
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Old 3rd October 2002, 07:02 PM   #105
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Thanks, EJ.
For me - and it seems to me everyone here - it is a real pleasure to share my passion with the other diyers.

I'll try to answer your questions:
1. Because I think that these are critical components, and I could find only good quality 470uF (or less) components (Elna Starget stuff). At least here in Italy.
If you want to simplify, a single 470uF piece will work fine: with 940uF (or 2x470) the lower cutoff frequency is about 4 (four) Hz with a 32 Ohm load, if the capacitor were 470uf, the Fc should be double.
Someone tells that many smaller caps sound better that a single bigger component, but I'm not sure about this.
2. Yes, I designed this just for Grado cans. I've tried with my SR325 cans, with a friend's RS-1 and SR80.
This can be done even with low bias current (say 100mA or so), but I prefer to run the amp hotter.
As soon as Cmoy from Headwize will be able to publish the whole article, you'll see some measurement with such loads.
The electrical capabilities are plentiful.
The sound is quite pretty, al least in my... heavy biased (!) opinion.
Thanks for your interest.
Marcello
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Old 4th October 2002, 01:08 PM   #106
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Hi Tortello,

I would like a copy of the files..

Thanks
pernils@online.no
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Old 11th October 2002, 07:56 PM   #107
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Hello Tortello, yet another request for your popular design.
At your convenience, could I please get a copy of the pdf? Thank you.

pjkunz@stanford.edu
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Old 10th November 2002, 03:39 PM   #108
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Hi Tortello

Please send me the file. Great job.

zapel@xtra.co.nz

Thank you.
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Old 10th November 2002, 07:55 PM   #109
Manu is offline Manu  Europe
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Thumbs up pcbs

Hi Tortello,
I would like a copy of the files.. Great job

Thanks

mchemineau@gmx.at
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Old 10th November 2002, 08:04 PM   #110
halojoy is offline halojoy  Sweden
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Default TORTELLO, Isn't TIME to make a HOMEPAGE?

Quote:
Originally posted by Manu
Hi Tortello,
I would like a copy of the files
It is still repeated here. The requests.

Put up a little homepage. You know they are for FREE.
Will not take many hours to do that.
There are several offering free webspace
with easy upload. And all the tools you need online.

fortunecity.com ... geocities.com .......

Or let someone else put the files on their homepage.
And post a link here.

I garantie you will not regret, Tortello.
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