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Old 22nd September 2004, 09:33 PM   #1
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Default Simplified LM3886 amp with PCB

Hello guys,

take a look on my schematic and my pcb, i truly want your comments and if this will be workable without hum and other problems.

it is an inverting design .. the 56K resistor in the input is there because i dont indent to use a POT


is everything correct so i can continue with construction?
did i miss something?

any comments for the pcb? what can i do to make it better??

thank you very much!
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Old 22nd September 2004, 09:35 PM   #2
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im trying to post the schematic
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Old 22nd September 2004, 09:37 PM   #3
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Where's the schematic?

On the pcb: move the right 2200uF a bit further to the right, move the 220k and 100n to the left of the right-hand 2200uF. That way, you can use the star ground and get rid of that jumper.

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Old 22nd September 2004, 09:51 PM   #4
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is this a better pcb?
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Old 22nd September 2004, 09:52 PM   #5
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and the schematic
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Old 22nd September 2004, 10:13 PM   #6
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the feedback resistor will be soldered between the chip's pins
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Old 22nd September 2004, 10:19 PM   #7
edpgc is offline edpgc  United Kingdom
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Well you've got a a single trace on the opposite side of the board, Its better, but I would make all the power traces as thick as you can.
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Old 22nd September 2004, 10:29 PM   #8
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power lines are thicker now... better?

what about the schematic? is it correct? im more worried about this

thanks guys!
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Old 22nd September 2004, 10:42 PM   #9
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Kostas, schematic is wrong : R1 must be connected into + input .
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Old 23rd September 2004, 09:08 AM   #10
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Thank you upupa! :-)

well what about now? everything correct??
should i continue with construction??

are the values and the schematic ok now?
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