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Old 21st August 2008, 03:28 PM   #1
Nordic is offline Nordic  South Africa
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Default 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...

Click the image to open in full size.
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Old 31st August 2010, 01:46 PM   #2
pgbhat is offline pgbhat  India
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Hi Nordic,

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

Regards,
pgbhat
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Old 31st August 2010, 04:39 PM   #3
AndrewT is online now AndrewT  Scotland
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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.
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Last edited by AndrewT; 31st August 2010 at 04:45 PM.
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Old 31st August 2010, 06:46 PM   #4
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Quote:
This could be worth re-starting the thread.
+2
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Old 1st September 2010, 07:12 AM   #5
pgbhat is offline pgbhat  India
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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
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Old 1st September 2010, 09:11 AM   #6
AndrewT is online now AndrewT  Scotland
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I you could develop the schematic and post it for cross checking, we can then look though the layout and make comment if necessary.
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Old 8th September 2010, 05:21 AM   #7
pgbhat is offline pgbhat  India
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Here is the schematics.
Is an inductor need in series with output?

Regards
pgbhat
Attached Files
File Type: pdf LM1875_SCH.pdf (41.1 KB, 283 views)
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Old 8th September 2010, 06:56 AM   #8
pgbhat is offline pgbhat  India
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Amp circuit I have used from ESP and speaker protection circuit from Mauro Penasa Amp

Regards
pgbhat
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Old 8th September 2010, 11:18 AM   #9
AndrewT is online now AndrewT  Scotland
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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.
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