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Old 3rd October 2006, 04:20 AM   #1
johndiy is offline johndiy  Greece
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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
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Old 3rd October 2006, 04:50 AM   #2
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Hi, John,

-LC
-RLC
-Cap Multiplier

I don't know why, but I like the one that don't have semiconductor in it
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Old 3rd October 2006, 04:54 AM   #3
johndiy is offline johndiy  Greece
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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
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Old 3rd October 2006, 10:12 AM   #4
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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 .
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Old 3rd October 2006, 01:39 PM   #5
moe29 is offline moe29  United States
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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
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Old 3rd October 2006, 05:14 PM   #6
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Did you use the artwork posted in Audio Amateur? If so,
there is a layout issue which contributes some noise and
is easily fixed.
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Old 5th October 2006, 04:44 AM   #7
johndiy is offline johndiy  Greece
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------------------------------------------------------------------------
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!!
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Old 5th October 2006, 06:23 AM   #8
TJ is offline TJ
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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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Old 5th October 2006, 06:41 AM   #9
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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.
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Old 5th October 2006, 11:20 AM   #10
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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?
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