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Old 26th July 2008, 04:29 PM   #11
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Default SORRY I WAS WRONG!PLz neglect previous post Gainclone is bad!!!!!!!!!!!!!!!

Sorry guys please neglect the previous post after one last test definitely my gainclone is very bad because using two discrete amps 1 for low pass and 1 for high pass there is no issue. My bad the gainclone is oscillating and making the rest of the circuit oscillate(discrete amp + volume control + active x-over) I'll scrap the the dirty pcb i made and create a new one. Jaycee can you please post back your layout thanks anyone else has a good pcb layout for a LM3886 gainclone thanks. I'll modify my circuit too with respect to your schematic jaycee.
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Old 27th July 2008, 05:23 AM   #12
ratza is offline ratza  Romania
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There you go.
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File Type: pdf 3886_layout.pdf (5.9 KB, 450 views)
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Old 27th July 2008, 05:24 AM   #13
ratza is offline ratza  Romania
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And the silk screen. The layout is already mirrored.
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File Type: pdf 3886_silk_screen.pdf (14.1 KB, 428 views)
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Old 27th July 2008, 05:26 AM   #14
ratza is offline ratza  Romania
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If anyone needs them, also the files from Eagle 5.0 are available
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File Type: zip gc.zip (47.8 KB, 309 views)
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Old 27th July 2008, 10:57 AM   #15
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Thanks for the files ratza. How does your gainclone sound? Great i am sure . Thanks again
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Old 27th July 2008, 11:59 AM   #16
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Checking the schematic and board i saw the mistake i did, i connected the Gnd pin of the ic to signal ground should have been at power ground. Thanks again
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Old 11th August 2008, 04:23 PM   #17
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Default Is my board good???????????

Hi can anyone tell me if the following board is good? Any comments are welcome
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Old 11th August 2008, 04:24 PM   #18
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Default Schematic for PC board

hi the schematic for the above board is the one attached.
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Old 11th August 2008, 04:33 PM   #19
AndrewT is offline AndrewT  Scotland
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Hi Z,
you are missing an output Zobel and an input RF filter.
In my opinion the 1uF and 22uF are far too small.
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Old 11th August 2008, 04:43 PM   #20
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Default Thanks andrew

Thanks for your reply Andrew the amp will be used as a tweeter amp not full range thats why i kept the caps to 1uF and 22uF. The zobel will be placed at speaker terminals sorry forgot to add this in the schematic. I will add a 470pF caps after the 1k resistor and the other end of the cap to signal ground. Will it be fine?

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