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Old 8th June 2004, 06:24 PM   #11
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Hey Guys

Two days ago, I finished my STK4191V after many years of being lazy. It sounded really good at listening tests, but I am wondering if the transformers I used are enough. I have used two 36 volt @ 5 Amp each,two bridges, and two 6800 uF smoothing capacitors, that gives me (+36 volt @ 5 Amp) and (-36 volt @ 5 Amp). I am driving 8 Ohm speakers, I just want to know if that is enough for this STK.

The PCB was a ready made one, bought it from Mr.Lumanauw from indonesia, the layout looks like the one stated in the datasheets. I had no oscillation problems, so that was a good enough result for me, because when I used veroboard I had notorious oscillations.

Any questions,I am here for you guys
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Old 8th June 2004, 06:53 PM   #12
p2mine is offline p2mine  Romania
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for my stk4192 i used +-22V rails for testing.
It was clearly not enough, and now I bought a toroid with 2x25V secondary. That means around +-35V no-load.
I think this would be enough.

About your amp, i think that it's enough 2x36V .
Still, stk4191 is rated to Vcc max +-53V. It's about the power you think you need. Personaly, I think that +- 36V is enough for your amplifier.
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Old 9th June 2004, 05:30 PM   #13
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Thank you for the reply p2mine, I was wondering if 5 Amp for each rail is enough at +/- 36 volt.

Thank you in advance
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Old 10th June 2004, 01:11 AM   #14
X.G. is offline X.G.  China
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To p2mine,

My advice correctly is :It will be better that the PCB traces of output GND from the common point of PSU fiter caps are independent.

I can't explain in my poor Engish,sorry.

cheers,

X.G.
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Old 10th June 2004, 07:14 AM   #15
p2mine is offline p2mine  Romania
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Now, can you please draw a scatch for me?

You are saying that for every cap should i have a different trace to the ground? I'm not sure I did understad clearly.

I've drawn a scatch using paint, and now this is the layout(the condensators were replaced only by one larger condensator)

where in this layout should I put the ground for the input?

Thanks for your reply!

Regards!
Attached Images
File Type: jpg gndloop.jpg (11.2 KB, 155 views)
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Old 10th June 2004, 07:19 AM   #16
p2mine is offline p2mine  Romania
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Click the image to open in full size.
This is the schetch.. I don't now why they don't display any more the pictures. Probably they don't have enough bandwith any more.....
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Old 10th June 2004, 09:08 AM   #17
X.G. is offline X.G.  China
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right.

I have no idea of the input GND.I think your origin arrangement is OK.
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Old 24th June 2004, 07:32 PM   #18
p2mine is offline p2mine  Romania
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Default building the PCB

lately, i was busy having school exams....

but, this is wat i've built untill now.

Click the image to open in full size.
Click the image to open in full size.

now one of my satelites:

Click the image to open in full size.

two satelites, staked:

Click the image to open in full size.

point to point wiring.....

Click the image to open in full size.
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Old 28th June 2004, 12:18 PM   #19
p2mine is offline p2mine  Romania
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I've finished my amp....

now, i have aproblem. on all 4 channels I have high frequency oscilations...
I've already blew 2 tweeters...

what can be the problem??
i've used the schematics presented in sanyo's pdf..
can the cause be because of the long wires to my soundcard? (tghe wires between my computer and the soundcard are aprox 8 meters long)

should I place some 300pf in parallel with the reaction resistors? would that elimnate the problem??
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Old 27th December 2011, 04:27 AM   #20
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Smile STK

hello
i am shavanth
do you have bottom layout for this STKamp
please share
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