Simplified LM3886 amp with PCB

KostasTheGreat · 22nd September 2004, 09:33 PM

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!

KostasTheGreat · 22nd September 2004, 09:35 PM

im trying to post the schematic

janneman · 22nd September 2004, 09:37 PM

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.

Jan Didden

KostasTheGreat · 22nd September 2004, 09:51 PM

is this a better pcb?

KostasTheGreat · 22nd September 2004, 09:52 PM

and the schematic

KostasTheGreat · 22nd September 2004, 10:13 PM

the feedback resistor will be soldered between the chip's pins

edpgc · 22nd September 2004, 10:19 PM

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.

KostasTheGreat · 22nd September 2004, 10:29 PM

power lines are thicker now... better?

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

thanks guys!

Upupa Epops · 22nd September 2004, 10:42 PM

Kostas, schematic is wrong : R1 must be connected into + input

.

KostasTheGreat · 23rd September 2004, 09:08 AM

Thank you upupa! :-)

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

are the values and the schematic ok now?

22nd September 2004, 09:37 PM	#3
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	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. Jan Didden __________________ /Another new issue: Linear Audio Volume 3!

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22nd September 2004, 09:35 PM	#2
KostasTheGreat diyAudio Member Join Date: Sep 2003 Location: Athens	im trying to post the schematic

22nd September 2004, 10:13 PM	#6
KostasTheGreat diyAudio Member Join Date: Sep 2003 Location: Athens	the feedback resistor will be soldered between the chip's pins

22nd September 2004, 10:19 PM	#7
edpgc diyAudio Member Join Date: Apr 2004 Location: Birmingham, UK	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.

22nd September 2004, 10:42 PM	#9
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	Kostas, schematic is wrong : R1 must be connected into + input .

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