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Old 6th June 2004, 02:24 PM   #1
p2mine is offline p2mine  Romania
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Default pcb for 2xSTK4141V

hy everybody!

I'm building a 4.1 sound system, and I choose to use STK amplifiers.
I've done my pcb for the surround speakers. Can someone tell how good or how bad is my pcb?
I've used the standard schematic for STK4141V.
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Old 7th June 2004, 04:32 PM   #2
p2mine is offline p2mine  Romania
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enybody?

I would appreciate your support. I don;t know too much about ground loops, and I think that there might be a problem. there somwhere...
the inputs are too far from the center ground point. can that be a major problem?

thanks in advance!
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Old 7th June 2004, 09:37 PM   #3
p2mine is offline p2mine  Romania
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somebody?
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Old 7th June 2004, 09:49 PM   #4
p2mine is offline p2mine  Romania
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so, if nobudy says anything, i'm gonna start buiding this.
I will use presss-and-peel paper with the toner method.
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Old 8th June 2004, 10:22 AM   #5
digi01 is offline digi01  China
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Hi p2mine,

The first step before making any boards would be to prototype the circuit and do extensive listening.I suggest you may bulid the amp use point to point or bread boards modes at first.

I have used STK439 and STK465 dual chips for my projects in 1993 year.it is sound good,impression!


good luck

-digi
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Old 8th June 2004, 01:27 PM   #6
X.G. is offline X.G.  China
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IMO,STK41X1 series power ICs are good,but not very good.They sound a bit harsh, lack of high freg,and very good in low freg.I think they maybe suit for sub woofer amp.

advice:the output GND of PCB separates with the input GND.

good luck

X.G.
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Old 8th June 2004, 01:46 PM   #7
p2mine is offline p2mine  Romania
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well, i've already done the point-to-point wiring.

actuallly i've already built the pcb for one STK4192 that i'm going to use as subwoofer amp.
the pcb is the one that sanyo reccomends in it's datasheet .

For me, the sound was impressing. I feel that this is the chip-amp I'm going to use.


another problem for me is what filters should I use for satelites and subwoofer?

I've design for subwoofer a 80dB/decade filter using TI's filterPro utility, and for the satelites a 60dB/decade. the cutoff frequency is for sub at 120Hz, and for satelites at 150Hz.

The sum of the signals looks like this:
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Old 8th June 2004, 03:48 PM   #8
p2mine is offline p2mine  Romania
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The ground for the inputs si now taken from the output point point .

Is this way better?
Why?
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Old 8th June 2004, 05:43 PM   #9
p2mine is offline p2mine  Romania
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now, the schematics for the sub filter filter:
80dB/decade, 120 Hz -3dB frequency, gain 1
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Old 8th June 2004, 05:44 PM   #10
p2mine is offline p2mine  Romania
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and for the satelites:
60 dB/dec, 150 Hz -3 dB frequency
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