Integrated LM1875 PCB

Nordic · 21st August 2008, 03:28 PM

I like my PCB in one piece as pieces of wire become nasty looking fast.
Yet I require a PSU an amp and some protection for the speakers.
Solution? Design an integrated layout.

I'd also like it to do some direct comparisons with LM3875 with nothing changeing except the chips.

Input and output on oposite sides of boards, and all power connections to the transformer at the centre .

Here is what I came up with...

I'd gladly share the files with anyone who'd like to make some, although I still need to complete a few values...

pgbhat · 31st August 2010, 01:46 PM

Hi Nordic,

Can you please share the eagle files for this.
I have few LM1875. Would like to try.

Regards,
pgbhat

AndrewT · 04:45 PM

Hi,
you are unlikely to get a reply.
This was his last post:
Destroyer x Amplifier...Dx amp...my amplifier

This is the first time I have noticed his chipamp layout. It looks like it is a single sided PCB.
It also has on board PSU and Speaker Protection/Delay.
Allows fit of a 3886 or 1875.
This could be worth re-starting the thread.

Ed LaFontaine · 31st August 2010, 06:46 PM

Quote:

This could be worth re-starting the thread.

+2

pgbhat · 1st September 2010, 07:12 AM

Thanks Andrew for you inputs.
Then let me start working on the schematics. I can take Nordic layout as reference. Do you suggest any improvement or changes to it.

Regards
pgbhat

AndrewT · 1st September 2010, 09:11 AM

I you could develop the schematic and post it for cross checking, we can then look though the layout and make comment if necessary.

pgbhat · 8th September 2010, 05:21 AM

Here is the schematics.
Is an inductor need in series with output?

Regards
pgbhat

pgbhat · 8th September 2010, 06:56 AM

Amp circuit I have used from ESP and speaker protection circuit from Mauro Penasa Amp

Regards
pgbhat

AndrewT · 8th September 2010, 11:18 AM

C8/18 is too low in value. It will have some AC voltage across it.

Delete Mauro's protection/delay circuit.
Look up D.Self's article to see how protection with relay should be done. there are other ways.

21st August 2008, 03:28 PM	#1
Nordic diyAudio Member Join Date: Sep 2005	Integrated LM1875 PCB I like my PCB in one piece as pieces of wire become nasty looking fast. Yet I require a PSU an amp and some protection for the speakers. Solution? Design an integrated layout. I'd also like it to do some direct comparisons with LM3875 with nothing changeing except the chips. Input and output on oposite sides of boards, and all power connections to the transformer at the centre . Here is what I came up with... I'd gladly share the files with anyone who'd like to make some, although I still need to complete a few values...

31st August 2010, 04:39 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, you are unlikely to get a reply. This was his last post: Destroyer x Amplifier...Dx amp...my amplifier This is the first time I have noticed his chipamp layout. It looks like it is a single sided PCB. It also has on board PSU and Speaker Protection/Delay. Allows fit of a 3886 or 1875. This could be worth re-starting the thread. __________________ regards Andrew T. Last edited by AndrewT; 31st August 2010 at 04:45 PM.

1st September 2010, 09:11 AM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I you could develop the schematic and post it for cross checking, we can then look though the layout and make comment if necessary. __________________ regards Andrew T.

8th September 2010, 11:18 AM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	C8/18 is too low in value. It will have some AC voltage across it. Delete Mauro's protection/delay circuit. Look up D.Self's article to see how protection with relay should be done. there are other ways. __________________ regards Andrew T.

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31st August 2010, 01:46 PM	#2
pgbhat diyAudio Member Join Date: May 2003 Location: Bangalore	Hi Nordic, Can you please share the eagle files for this. I have few LM1875. Would like to try. Regards, pgbhat

1st September 2010, 07:12 AM	#5
pgbhat diyAudio Member Join Date: May 2003 Location: Bangalore	Thanks Andrew for you inputs. Then let me start working on the schematics. I can take Nordic layout as reference. Do you suggest any improvement or changes to it. Regards pgbhat

8th September 2010, 06:56 AM	#8
pgbhat diyAudio Member Join Date: May 2003 Location: Bangalore	Amp circuit I have used from ESP and speaker protection circuit from Mauro Penasa Amp Regards pgbhat

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