To NP the one and only!

johndiy · 3rd October 2006, 04:20 AM

Dear Nelson

Goodevening

i have built a zen which i use it for headphone listening
it is powered by mains ps, ripple is low but for headphone
listening is unacceptable

what do you suggest i do to ps to keep the hum low
should i use regulation (discrete or ic?) or use passive
filter smoothing

can you post a good ps circuit i could use

thank you Nelson

john

ps if anybody can suggest solution to my problem please do

lumanauw · 3rd October 2006, 04:50 AM

Hi, John,

-LC
-RLC
-Cap Multiplier

I don't know why, but I like the one that don't have semiconductor in it

johndiy · 3rd October 2006, 04:54 AM

Hi David
thanks thats very nice of you

well
can you design for me a ps circuit and post it
here so i can try it out

thanks again youre a champion

john

lumanauw · 3rd October 2006, 10:12 AM

Hi, John,

There are alot-lot-lot of examples of what you need here. A little search will help to find it.
From NP (in various amps/articles), from the Zen series of articles, from Choky examples, from Blowtorch thread (intended for small currents, but use the principle), and many more. They are all better than what I can draw

.

moe29 · 3rd October 2006, 01:39 PM

if you look under legacy projects on the passdiy website - the
Zen Revisited article discusses a PSU update. Going CLC really
quieted down my Zen amp.

And then of course there's this legendary thread:

Tortello's Zen-like headphone amp

Nelson Pass · 3rd October 2006, 05:14 PM

Did you use the artwork posted in Audio Amateur? If so,
there is a layout issue which contributes some noise and
is easily fixed.

johndiy · 5th October 2006, 04:44 AM

------------------------------------------------------------------------
Nelson Pass:
Did you use the artwork posted in Audio Amateur? If so,
there is a layout issue which contributes some noise and
is easily fixed.
-----------------------------------------------------------------------

Hi Nelson

the amp is similar to zen but not zen

you are truly spot on with layout issues though,
hum is induced at the input and this has been
the cause of the problem

after doing some tests, i have managed to isolate
the layout problem and come up with a partial
cure i am satisfied with ,there is still slight hum
but this is in line with some sony amps i have
tested

actually i thought i needed to improve the ps but
after doing some tests it was found to be rock
solid ,then i turned my attention to what youve
pointed out and bingo!

i want to thank you nelson for taking time to
answear and help me solve this problem you are
truly amazing,,, nelson nelson nelson!!!,,, no1!!,,,

kind regards

john
ps: i am a student so thanks for your help guys!!

TJ · 5th October 2006, 06:23 AM

hi , i got one crazy idea about the inductor . Can i use the inductor from the speaker x- over put into my aleph amplifier power supply ? some sub woofer inductor are very big and high inductance .

jacco vermeulen · 5th October 2006, 06:41 AM

Depends on the type of coil and rating, TJ.
The aircoils used for CLC arrangements can be/are also used for loudspeaker filters. Some DIY loudspeaker kit shops sell the kind of coils which are generally used to make a CLC, i bought a number of really big ones during a sell-out by one of those shops overhere.
The majority of coils in filters are types with cores, they can not handle the high DC load in CLCs and will saturate.
Afaik, only two here have had satisfactory results with a core type coil in a CLC, a Torobar coil with a 600 watt rating.
That has to be a very impressive subwoofer if it has a filter with a suitable coil to use in a CLC.

Babowana · 5th October 2006, 11:20 AM

Quote:

Originally posted by johndiy

. . . then i turned my attention to what youve
pointed out and bingo!

What gave you the bingo! . . . ?
What's that?

3rd October 2006, 04:20 AM	#1
johndiy Banned Join Date: Aug 2006	To NP the one and only! Dear Nelson Goodevening i have built a zen which i use it for headphone listening it is powered by mains ps, ripple is low but for headphone listening is unacceptable what do you suggest i do to ps to keep the hum low should i use regulation (discrete or ic?) or use passive filter smoothing can you post a good ps circuit i could use thank you Nelson john ps if anybody can suggest solution to my problem please do

5th October 2006, 06:41 AM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Depends on the type of coil and rating, TJ. The aircoils used for CLC arrangements can be/are also used for loudspeaker filters. Some DIY loudspeaker kit shops sell the kind of coils which are generally used to make a CLC, i bought a number of really big ones during a sell-out by one of those shops overhere. The majority of coils in filters are types with cores, they can not handle the high DC load in CLCs and will saturate. Afaik, only two here have had satisfactory results with a core type coil in a CLC, a Torobar coil with a 600 watt rating. That has to be a very impressive subwoofer if it has a filter with a suitable coil to use in a CLC. __________________ Looks like Sponge Bob has killed another thread.

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3rd October 2006, 04:50 AM	#2
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, John, -LC -RLC -Cap Multiplier I don't know why, but I like the one that don't have semiconductor in it

3rd October 2006, 04:54 AM	#3
johndiy Banned Join Date: Aug 2006	Hi David thanks thats very nice of you well can you design for me a ps circuit and post it here so i can try it out thanks again youre a champion john

3rd October 2006, 10:12 AM	#4
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, John, There are alot-lot-lot of examples of what you need here. A little search will help to find it. From NP (in various amps/articles), from the Zen series of articles, from Choky examples, from Blowtorch thread (intended for small currents, but use the principle), and many more. They are all better than what I can draw .

3rd October 2006, 01:39 PM	#5
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	if you look under legacy projects on the passdiy website - the Zen Revisited article discusses a PSU update. Going CLC really quieted down my Zen amp. And then of course there's this legendary thread: Tortello's Zen-like headphone amp

3rd October 2006, 05:14 PM	#6
Nelson Pass The one and only Join Date: Mar 2001	Did you use the artwork posted in Audio Amateur? If so, there is a layout issue which contributes some noise and is easily fixed.

5th October 2006, 04:44 AM	#7
johndiy Banned Join Date: Aug 2006	------------------------------------------------------------------------ Nelson Pass: Did you use the artwork posted in Audio Amateur? If so, there is a layout issue which contributes some noise and is easily fixed. ----------------------------------------------------------------------- Hi Nelson the amp is similar to zen but not zen you are truly spot on with layout issues though, hum is induced at the input and this has been the cause of the problem after doing some tests, i have managed to isolate the layout problem and come up with a partial cure i am satisfied with ,there is still slight hum but this is in line with some sony amps i have tested actually i thought i needed to improve the ps but after doing some tests it was found to be rock solid ,then i turned my attention to what youve pointed out and bingo! i want to thank you nelson for taking time to answear and help me solve this problem you are truly amazing,,, nelson nelson nelson!!!,,, no1!!,,, kind regards john ps: i am a student so thanks for your help guys!!

5th October 2006, 06:23 AM	#8
TJ diyAudio Member Join Date: Sep 2001 Location: UK	hi , i got one crazy idea about the inductor . Can i use the inductor from the speaker x- over put into my aleph amplifier power supply ? some sub woofer inductor are very big and high inductance .

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