My LM3875 and LM3886 gainclone PCBs - diyAudio
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Old 27th October 2004, 09:13 PM   #1
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Talking My LM3875 and LM3886 gainclone PCBs

After few tests of the gainclone amplifier I decided to make my own PCBs for it. On the pictures below you can see the results of my work.

PCB for LM3875 has its own double bridge, place for 2 x 1800uF/50V Panasonic FC, input and NFB capacitors. LM3886 PCB is a typical application circuit from the National Semiconductor note.

The LM3875 topic was discuss so many times on this forum so I will just say: GC sounds GREAT! It was worth building a PCB for it
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Old 27th October 2004, 09:14 PM   #2
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picture 2
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Old 27th October 2004, 09:18 PM   #3
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picture 3

LM3886 board.
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Old 27th October 2004, 09:27 PM   #4
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Nice work, indeed. I see also that you have use the same parts placement as I have done, power to the left. I think this is a good idea to keep power gathered at the left and signals at the right.
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Old 27th October 2004, 09:28 PM   #5
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And one more...
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Old 27th October 2004, 09:44 PM   #6
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Thank you Peranders Its easy when using a double layer PCB top is for power and the bottom for signal tracks (excluding speaker output).
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Old 27th October 2004, 10:28 PM   #7
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Who did you have make your PCB? Mind if I inquire as to expense?
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Old 28th October 2004, 07:20 AM   #8
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Of course One board for LM3875 costs 5$. The LM3886 pcb is cheaper 2.5$ because its one layer, 70um cupper. All made by Hatron
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Old 28th October 2004, 07:34 AM   #9
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Default Can you post the PCB

Is it possible for you to post the PCB's on the forum?
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Old 28th October 2004, 04:05 PM   #10
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Sorry for now its impossible, maybe some day (now Im a student) it will be a commercial project But I can send you a bottom side of the lm3886 board in pdf format if you want?
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