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Old 26th February 2002, 06:33 PM   #21
paulb is offline paulb  Canada
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Hi, tschrama. I found that the hum was present with a power supply that had fairly high ripple, but not with my lab supply. The voltage supply to the amp board itself had no ripple because of the cap multiplier. My conclusion was that the ripple current coming into the cap multiplier was inducing a voltage somewhere in the amp circuit, or more likely in the ground wires connecting the two (no, not a ground loop - separate ground wires for each channel, and for their bypass caps). Smoothing the ripple before it got inside the box solved the problem.
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Old 5th March 2002, 03:51 AM   #22
jduncan is offline jduncan  United States
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tortello,

could you please send me a higher quality image?

Thanks!

Joseph


jduncan@mit.edu
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Old 19th March 2002, 09:09 AM   #23
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Hi Tortello,

Nice circuit! just what I need, could you please e-mail me the Pdf File, if you have a PCB layout that would be cool too! (I hate doing PCBs!)

Regards Mozfet

goodstuff57@hotmail.com
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Old 19th March 2002, 10:52 AM   #24
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Question Tortello

This looks very interesting, great work.

Would you be so kind as to send me the pdf file you have mentioned. I think I`ll have a go at this.

Thank you and regards.

Axel

g-ax@online.no
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Old 20th March 2002, 10:01 AM   #25
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OK, Mozfet and Axel, I've sent to you the ".pdf" files.
Thank for your interest.
Tortello
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Old 6th June 2002, 01:51 PM   #26
YLS is offline YLS
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Tortello,
Could you please send me a copy of your pdf file.
Thanks

lsyu@hongkong.com
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Old 6th June 2002, 04:48 PM   #27
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Default pdf file request

Dear Tortello,

I'd also appreciate your *.pdf file.

Thanks,

Norman

buchignani@telus.net
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Old 7th June 2002, 04:32 AM   #28
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Default soz headphone amp.

i got a great idea, maybe soz will be a better solution of headphone amp. it will be easily build, i guess.
maybe i should do a try.
__________________
Maybe i should not be lazy again
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Old 7th June 2002, 07:30 AM   #29
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Hello all
as soon as possible, I'll publish the whole project on Headwize website.
The new power supply comprise also a simple anti-bump circuit, very ueful especially with low impedance headphones.
Marcello
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Old 7th June 2002, 08:00 AM   #30
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Hello John-China,
your idea is not at all new, you can find other threads about Bal-Zen (what is, in point of facts, the same conceptual thing) by the DIYAudio search engine.
The problem here is the headphones "common-grond", to achieve best results probably you should re-wire all your headphones: I'm not willing to do this.
Marcello
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