amp32-ps.. smd...is singing!!!

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nicoch58

nicoch58

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Joined 2004
#1
My little amp32ps is still beta3 ,but work fantastic
some photo

:cop: expired links removed

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
amp32-ps
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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#2
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,
Nils
 
#3
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 ?

spake?

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...
 
#7
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.
 
#8
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
 
#10
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 (41hz.com), must add that I'm totally satisfied with his service and reaction speed on my emails..🙂 😎 😎 🙂 😎
 
#13
hi v-bro

no the amp work fine .....12000mf start up is problem, no problem for dc in the ac input rail of amp32PS!

working solution

pc power supply +12v DC--->220ohm(only for start up,after manual bypass)--->bridge(AC input)---C1 12000mF--amp

This becouse I order amp32PS for linear supply but with unregulated Ps the max V is only 11.7.. from 41hz site:

" Let's say you use a 50VA / 9V AC transformer. After rectification you would have a full power voltage of 1.41 x9 V = 12.7V. You will have a voltage drop of around 1V in the diodes so remaining you will have about 11.7V at full load. At idle you may have 20% higher voltage = 14V which is OK. A 10VAC transformer could have an idle voltage unpleasantly close to the 16V limit. With 11.7V at full power you would have about 2x16W output compared to 25W at 14.6V. So if your mains grid voltage is stable and you are not aiming for maximizing the power output you may be happy using a supply built with a un-stabilized 9VAC transformer.
But if your mains grid supply is less voltage stable and/or if you want to maximize the output, you may want to use a stabilized power supply. You could design it so that you will have 14.5 V both at full load and idle and even if the grid voltage varies a bit. So a stabilized power supply makes sense for these amplifiers. And as the power is fairly small it is feasable to build one."

linear ps is clean supply line but with the cost of troroidal I can bay e second amp32 for Biamp.......to maxmize the stereo image and fit both in the PC tower bucket

the bypass of bridge is only for maximize the V (+1V)

IHMO
 
#15
HI

I have removed the sleep turn on, because with 220ohm in serie to PS input the led is off ,when the bypass the amp turn on with no pop or bump,only a very litte click
🙂

I have update the gallery, with a sex woofer of little wharfedale 9sr ,for 70€.....sound very smooth with sub

:cop: expired links removed.
 
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#16
That driver looks seriously good!😎 A bit like in a DM601 from B&W....

Only, did you remove the stuffing from the enclosure? If it hasn't got any stuffing I would try some!😱

Can you specify more on how you removed the sleep turn on?
 
#17
hi v-bro

only for photo I removed the stuffing and for look a 8mf on tweeter .......
the full range diamond 9.1 at 180€ + 2x amp32(amp4?) is wondefull budget solutions,perfect for PC....I thinking e little upgrade...!!

I removed the switch for sleep and with a simple bridge on pbc ...
 
#19
I've made six amp32's so far, I think it must be the smallest amp in the world with such power and soundquality!

Made two with 1000uF buffercaps, the rest with the supplied 470uF (normally you get 330uF on amp32, but luckaly Jan put the larger ones in by mistake :worship: The larger ones are normally used in amp32PS )

Here's a link to the pictures:http://www.diyaudio.com/forums/showthread.php?s=&threadid=89549&perpage=10&pagenumber=4

I can't yet say the larger caps make much difference, most of'em haven't played for more than a few hours...
 
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