lm3875 single sided pcb layout

SolderN · 10th August 2009, 10:16 PM

Hi everyone I am new to the forum!
I build guitars, pedals and I want to get into amps. Chip amps sound like the best way into the amp world. I picked up some Lm 3875t chips and now I am looking for a pcb pattern for it. I have used the search function but was unable to dig up a good layout.

raudio1969 · 11th August 2009, 03:03 AM

How about this?

http://www.audiosector.com/images/lm3875_se_pcb.gif

454Casull · 11th August 2009, 03:16 AM

That doesn't look single-sided to me.

AndrewT · 12th August 2009, 09:16 AM

Hi,
indeed it is not single sided.
You could implement the blue traces with hard wiring to the components leads left slightly long.

SolderN · 12th August 2009, 02:31 PM

Yeah, I think I will go that route. I know I could have had this amp built already on perf but I wanted an amp I could take out of the house and not worry about. If it was a home amp I would buy some nice perf and go to town but this thing is going to be moved around more.
I am almost done with the board. I would post it but out of respect for the designer I will not.

peranders · 12th August 2009, 02:39 PM

Why can't you publish your own work? The engineering level of a basic LM3875 design isn't particularly high you know.

SolderN · 12th August 2009, 07:16 PM

The board I have is an adaptation of his layout. I know these things are as basic as it gets but I don't want to put anyone in a position where they choose my version of his board because it's free. He took the time to get them made up , his prices are fair and I don't want to detract from his sales. That is how I see it. He may have even published the large snapshot on his site for guys who were handy with photo shop. I don't know. I can use eagle I have not created any devices for my library yet and at the moment I don't have time to learn.
I know very little about what is needed for a good layout so that is something I need to study.
I would like to ad that it might not be a bad idea to get some brass rivets for the holes if you make the boards. You can get them on ebay cheap.

peranders · 12th August 2009, 07:26 PM

Quote:

Originally posted by SolderN
....
I know very little about what is needed for a good layout so that is something I need to study.

It's hard to give you any hints of improvement if we can't see anything

SolderN · 12th August 2009, 08:25 PM

Ok, I guess I need to clarify. I took the Audio Sector board modified it in Gimp ( it like photo shop) and now I have a board I can use. Because it started out as as Audio Sector design I will not post it. If I had started from scratch I would post it. I was surprised I did not find a ton of patterns when I started looking, it seems like a common chip.

peranders · 12th August 2009, 08:48 PM

Notice that this is a double-sided design.

10th August 2009, 10:16 PM	#1
SolderN diyAudio Member Join Date: Aug 2009	lm3875 single sided pcb layout Hi everyone I am new to the forum! I build guitars, pedals and I want to get into amps. Chip amps sound like the best way into the amp world. I picked up some Lm 3875t chips and now I am looking for a pcb pattern for it. I have used the search function but was unable to dig up a good layout.

11th August 2009, 03:16 AM	#3
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	That doesn't look single-sided to me. __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

12th August 2009, 02:39 PM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Why can't you publish your own work? The engineering level of a basic LM3875 design isn't particularly high you know. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

12th August 2009, 08:48 PM	#10
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Notice that this is a double-sided design. __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

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11th August 2009, 03:03 AM	#2
raudio1969 diyAudio Member Join Date: Sep 2007 Location: N38	How about this? http://www.audiosector.com/images/lm3875_se_pcb.gif

12th August 2009, 09:16 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, indeed it is not single sided. You could implement the blue traces with hard wiring to the components leads left slightly long.

12th August 2009, 02:31 PM	#5
SolderN diyAudio Member Join Date: Aug 2009	Yeah, I think I will go that route. I know I could have had this amp built already on perf but I wanted an amp I could take out of the house and not worry about. If it was a home amp I would buy some nice perf and go to town but this thing is going to be moved around more. I am almost done with the board. I would post it but out of respect for the designer I will not.

12th August 2009, 07:16 PM	#7
SolderN diyAudio Member Join Date: Aug 2009	The board I have is an adaptation of his layout. I know these things are as basic as it gets but I don't want to put anyone in a position where they choose my version of his board because it's free. He took the time to get them made up , his prices are fair and I don't want to detract from his sales. That is how I see it. He may have even published the large snapshot on his site for guys who were handy with photo shop. I don't know. I can use eagle I have not created any devices for my library yet and at the moment I don't have time to learn. I know very little about what is needed for a good layout so that is something I need to study. I would like to ad that it might not be a bad idea to get some brass rivets for the holes if you make the boards. You can get them on ebay cheap.

12th August 2009, 08:25 PM	#9
SolderN diyAudio Member Join Date: Aug 2009	Ok, I guess I need to clarify. I took the Audio Sector board modified it in Gimp ( it like photo shop) and now I have a board I can use. Because it started out as as Audio Sector design I will not post it. If I had started from scratch I would post it. I was surprised I did not find a ton of patterns when I started looking, it seems like a common chip.

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