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Old 8th November 2006, 02:32 PM   #1
diyAudio Member
Join Date: Oct 2004
Default amp32-ps.. singing!!!

My little amp32ps is still beta3 ,but work fantastic
some photo

my target is explorer computer as source,I think that I'm a good point...

player is foobar,dsp secret rabbit for upsampling to 24/96,driver asio
usb dac m-audio transit 24/96
sat little wharfedale
sub active jbl
file format flac,mp3

Is not my audionote cd-diy 300bSE-diy scanspeak but for near fild the sound is wonderful ,in headphone style...

My amp32-ps is connect directely to pc power enermax ,on dedicate vga line,no hum pop ecc...
I powerup the pc then the amp, before the win boot no problem but after(es. on desktop)the pc reset!!!

I think that the problem is the large C1...can I tray 250ohm in series,end after softstat bypass them?

there is one better solution??
thanks for help

PS. For now the diode is in place becouse i think that hidden the C1 fom pc power but 1v is very important ,alternative solution remove the bridge whith only one diode in place ,only 0.5 v lost
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Old 8th November 2006, 03:36 PM   #2
diyAudio Member
Join Date: Dec 2005
Location: Berlin
Hi there,
if i understood you right, the PC crashes when you turn on the amp. This could be due to a short somewhere, but in that case it probably wouldn't play at all.
Are you sure you connected the amp to the +12V out? It should have many (>10A) power and should be able to deal with the load (at least i think). But there is another -12V supply which is far less powerful and would definately collapse and crash the computer. Did you check that?
Good Luck,
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Old 8th November 2006, 04:53 PM   #3
diyAudio Member
Join Date: Oct 2004
HI Nilsomat

the amp work fine, the problem in power up!
If I power up my pc and after some second the amp--- no problem

If i try during win boot the pc reset ! cpu-hd heavy load

C1 is 12000uf too much ?


the pc can power up the amp but some tripath chip burn diuring SMPS power up
Enermax is very good but softstart can help both...
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Old 8th November 2006, 04:57 PM   #4
diyAudio Member
Join Date: Oct 2004
My amp32-ps is connect directely to pc power enermax ,on separate vga line 14A
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Old 8th November 2006, 10:17 PM   #5
RX5 is offline RX5  Philippines
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Location: TaC
use a DIFFERENT power supply

hhhmmmmm I can see in your pics, black cap.. 12000uF you say?

well thats TOO much (on power-up).... try lowering to 1000uF....
RoCk On!!! I love my diy UcD!!
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Old 8th November 2006, 10:22 PM   #6
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Join Date: Oct 2004
too much easy
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Old 9th November 2006, 05:09 AM   #7
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Location: Wisconsin....what did you expect?
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Make sure you're using the same power rail as your CD-ROM drives - it's attached to the +12v and ground. There's also a -12v rail, which is usually only capable of about 100ma.

A 1,000uf cap probbably is causing a nasty voltage dip. I'd just get a second computer PSU for about 10$, and use it instead.
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Old 9th November 2006, 08:58 AM   #8
diyAudio Member
Join Date: Oct 2004
Thanks for help

the black 12000mf is very compact 16v

the amp is connectc to enermax second dedicated vga line14A, I tray with external pc power supply the problem is the same.....

the pc is heavy overclock...

this weekend I tray softstart and primary power line ,mod the m-audio output stage, and place both in the pc case
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Old 9th November 2006, 10:20 PM   #9
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220 Ohm work perfectly ,no reset!

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Old 9th November 2006, 10:58 PM   #10
v-bro is offline v-bro  Netherlands
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Ok Ok, but still can you elaborate on how you connect the power to the amp? I suppose you know the amp32ps has an on-board power supply with a retifier bridge etc.etc. Connecting DC to the AC rails wouldn't be wise, hope you didn't make this mistake....

What I understand from your story (can't make this clear from the pics) is that you allready have clean DC supply, if so you could've also used amp32 without ps.....

I've just received four amp32 kits from Jan (, must add that I'm totally satisfied with his service and reaction speed on my emails..
Max. cone displacement can be several foot on any speaker!Too bad it can be done only once......
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