Another Single Sided DIY PCB for LM3886 + Power Supply - Page 2

tomchr · 16th March 2010, 12:24 AM

Nice. Much better. You might be able to shave a bit off the width of the board by bringing the supply traces in at a 45 degree angle. You could then move the mounting holes down and in. Just a detail.

~Tom

kuldeepsingh · 16th March 2010, 04:47 AM

Quote:

Originally Posted by tomchr

Nice. Much better. You might be able to shave a bit off the width of the board by bringing the supply traces in at a 45 degree angle. You could then move the mounting holes down and in. Just a detail.

~Tom

I love you sir.

kuldeepsingh · 16th March 2010, 06:52 AM

Ok the voltage tracks are shifted to accommodate mounting screws. I hope after this i can make a prototype this weekend

.

kuldeepsingh · 09:38 AM

Just finished one prototype. Will run the amplifier tomorrow. The pads came out to be small and a little trouble with soldering. Will also increase the width to make component layout a little spacious and easy access to audio input and output terminals.
Will update the PCB layout.
More Build pics are here - DIY Audio Amplifier Blog: LM3886 first prototype

Andreq · 22nd June 2010, 05:00 PM

I would like to know if you have the layout as an eagle file.

I think I'll use this simple aproach instead of trying (too hard) to design my own

p.s. sorry for bumping an old thread

AndrewT · 22nd June 2010, 11:57 PM

the + & - rails are too far apart.
They will act like an aerial and emit radiation into all the circuits nearby.
Small loop area for circuiting currents is a must.
Since the rails carry half wave rectified copies of the output AC then the power ground must also be included in the small loop area giving a triplet for the cable to the amp and for the traces on the PCB.

J.R.Freeman · 2nd July 2010, 04:32 AM

Quote:

Originally Posted by AndrewT

the + & - rails are too far apart.
They will act like an aerial and emit radiation into all the circuits nearby.

Hey there Andrew,

This is approaching paranoia. AC components on the power rails will be in the audio spectrum mostly, fairly low in amplitude, and sinusoidal. I don't think radiated emissions are much of a concern here.

'looks like a nice layout!

Jim

koljosli · 16th December 2010, 01:52 PM

And i'd like ask you is this amp working well ? ?

kuldeepsingh · 03:51 PM

Quote:

Originally Posted by koljosli

And i'd like ask you is this amp working well ? ?

Ya, its working fine, but i am not using it currently. i already have a LM4780 setup.

Would you like to make it yourself

kuldeepsingh · 20th December 2010, 03:54 PM

Quote:

Originally Posted by Andreq

I would like to know if you have the layout as an eagle file.

I think I'll use this simple aproach instead of trying (too hard) to design my own

p.s. sorry for bumping an old thread

sorry for the late reply... i just saw it today only.
i don't have eagle layout as i use autocad. But you can have true size PCB layout in pdf format from my blog.

22nd June 2010, 11:57 PM	#16
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	the + & - rails are too far apart. They will act like an aerial and emit radiation into all the circuits nearby. Small loop area for circuiting currents is a must. Since the rails carry half wave rectified copies of the output AC then the power ground must also be included in the small loop area giving a triplet for the cable to the amp and for the traces on the PCB. __________________ regards Andrew T.

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16th March 2010, 12:24 AM	#11
tomchr diyAudio Member Join Date: Feb 2009 Location: Greater Seattle Area	Nice. Much better. You might be able to shave a bit off the width of the board by bringing the supply traces in at a 45 degree angle. You could then move the mounting holes down and in. Just a detail. ~Tom

22nd June 2010, 05:00 PM	#15
Andreq diyAudio Member Join Date: Nov 2005 Location: Here am I	I would like to know if you have the layout as an eagle file. I think I'll use this simple aproach instead of trying (too hard) to design my own p.s. sorry for bumping an old thread

16th December 2010, 01:52 PM	#18
koljosli diyAudio Member Join Date: Dec 2010	And i'd like ask you is this amp working well ? ?

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