ZEN-like headphones amp - Page 3

paulb · 26th February 2002, 06:33 PM

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.

jduncan · 5th March 2002, 03:51 AM

tortello,

could you please send me a higher quality image?

Thanks!

Joseph

jduncan@mit.edu

mozfet · 19th March 2002, 09:09 AM

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

Salmacis · 19th March 2002, 10:52 AM

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

tortello · 20th March 2002, 10:01 AM

OK, Mozfet and Axel, I've sent to you the ".pdf" files.
Thank for your interest.
Tortello

YLS · 6th June 2002, 01:51 PM

Tortello,
Could you please send me a copy of your pdf file.
Thanks

lsyu@hongkong.com

buchignani · 6th June 2002, 04:48 PM

Dear Tortello,

I'd also appreciate your *.pdf file.

Thanks,

Norman

buchignani@telus.net

john-china · 7th June 2002, 04:32 AM

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.

tortello · 7th June 2002, 07:30 AM

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

tortello · 7th June 2002, 08:00 AM

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

19th March 2002, 10:52 AM	#24
Salmacis diyAudio Member Join Date: Feb 2002 Location: Norway	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

6th June 2002, 04:48 PM	#27
buchignani diyAudio Member Join Date: Mar 2002 Location: Canada	pdf file request Dear Tortello, I'd also appreciate your *.pdf file. Thanks, Norman buchignani@telus.net

7th June 2002, 04:32 AM	#28
john-china diyAudio Member Join Date: Feb 2001 Location: where fair living	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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26th February 2002, 06:33 PM	#21
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	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.

5th March 2002, 03:51 AM	#22
jduncan diyAudio Member Join Date: Nov 2001 Location: Boston, MA, USA	tortello, could you please send me a higher quality image? Thanks! Joseph jduncan@mit.edu

19th March 2002, 09:09 AM	#23
mozfet diyAudio Member Join Date: Mar 2002	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

20th March 2002, 10:01 AM	#25
tortello diyAudio Member Join Date: Jul 2001 Location: Genoa (ITALY)	OK, Mozfet and Axel, I've sent to you the ".pdf" files. Thank for your interest. Tortello

6th June 2002, 01:51 PM	#26
YLS diyAudio Member Join Date: Jun 2002 Location: _	Tortello, Could you please send me a copy of your pdf file. Thanks lsyu@hongkong.com

7th June 2002, 07:30 AM	#29
tortello diyAudio Member Join Date: Jul 2001 Location: Genoa (ITALY)	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

7th June 2002, 08:00 AM	#30
tortello diyAudio Member Join Date: Jul 2001 Location: Genoa (ITALY)	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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