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Old 12th October 2012, 08:50 PM   #1
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Default LM3875 PCB Verification and suggesions required

Hello Diyaudio members,

I have just completed PCB drawing of LM3875.
This is a standard lm3875 circuit with
1.an input rf filter
2.220 pf cap between pin 7 and 8
3.led power indicator connected with -V(works as additional bleeder)
4.at the left hand side there is a relay delay(DPDT) circuit controlled by 555 and powered by lm317(delay section is verified)
5. there is a local star ground point with speaker ground and zobel grounds are separate and will be connected directly to the main star ground.

At best of my knowldge the schematic is correct. But I want to take your suggestions regarding pcb population, mostly on critical sections and ground connections.


Please note that the straight lines are connectors
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Old 13th October 2012, 01:30 AM   #2
WSJ is offline WSJ  United States
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You have a great layout. I would use two holes at each external connection for push on terminals.
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Old 13th October 2012, 04:07 AM   #3
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Quote:
Originally Posted by WSJ View Post
You have a great layout. I would use two holes at each external connection for push on terminals.
I don't understand...please discuss in details
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Old 13th October 2012, 04:21 AM   #4
WSJ is offline WSJ  United States
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This amp has male push on terminals. Wires or terminals can be used.
Keystone 1287 pictured.
Keystone Electronics Corp. - .250 [6.35] Quick-Fit Terminals


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Old 13th October 2012, 07:46 AM   #5
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I will solder wires directly. I had just taken some terminal block for space references...and thanks for your reply.

There are only few comments!!!!!!Come and share your views
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Old 13th October 2012, 08:05 PM   #6
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??
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Old 14th October 2012, 09:52 AM   #7
AndrewT is online now AndrewT  Scotland
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where is your schematic?
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regards Andrew T.
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Old 14th October 2012, 05:49 PM   #8
WSJ is offline WSJ  United States
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By adding the holes for the Keystone 1287 terminals, you could sell boards and cover the cost of your project. These boards are great, I would buy some.
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Old 14th October 2012, 08:19 PM   #9
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Quote:
Originally Posted by AndrewT View Post
where is your schematic?
please check the schematic.

The relay delay circuit is not shown.....
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Old 15th October 2012, 06:36 AM   #10
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I almost forget to mention that this power amp will be used for guitar amp!
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