My Home theater with LM1876, LM1875, LM3876 For Dummies - diyAudio
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Old 1st March 2008, 06:53 AM   #1
Paswa is offline Paswa  India
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Angry My Home theater with LM1876, LM1875, LM3876 For Dummies

I'm going to build a good 5+1 channel ht with 2*LM1876, 1*LM1875, 1*LM3876.

Now there is the PCB of LM1876, Which I designed using PCB Express,

Click the image to open in full size.

And the schematic is the "Auxiliary Amplifier Circuit" as it was in the official datasheet. I just removed the inductor.

Tell me your suggestions.

And this is the power split supply pcb is here -
Click the image to open in full size.
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Old 1st March 2008, 10:25 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
I don't understand why you think you need different chipamp types for each channel.
Could you explain your reasoning?
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Old 1st March 2008, 11:04 AM   #3
Paswa is offline Paswa  India
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NO...no...

I'm using a LM1876 IC for Front channels, another LM1876 for rear, a LM1875 for center and a LM3876 for Subwoofer.

understand?
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Old 1st March 2008, 11:31 AM   #4
AndrewT is offline AndrewT  Scotland
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that's my understanding.
Why choose three different chipamp types for the different channels?
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Old 1st March 2008, 11:44 AM   #5
Paswa is offline Paswa  India
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Quote:
Why choose three different chipamp types for the different channels?
ok, this may be a solution, to use two LM1876 for front and rear. and one bridged LM1876 for subwoofer. And one LM1875 for centre.

Yeh, this is the best solution.
Now look at my PCB layout.
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Old 1st March 2008, 12:07 PM   #6
jimmy.e is offline jimmy.e  Sweden
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power supply board.

check polarity on c3,c4 and c7,c8 (+ is on ground lead)

Take away diods on pcb and buy a standalone diod bridge,that u can screw on the heatsink.

nevermind: iam tired,and shouldnt surf,check boards
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Old 1st March 2008, 12:52 PM   #7
Paswa is offline Paswa  India
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Quote:
check polarity on c3,c4 and c7,c8 (+ is on ground lead)
thanks, but, In negative supply rails, the capacitor's positive pole should be connected to the GND, and the negative pole must be connected to the negative.
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Old 1st March 2008, 08:21 PM   #8
y8s is offline y8s  United States
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if you route pin 15 under the 1K resistor just below it and around the outside of the board, you can then evenly space your input leads if you wanted to use a standard connector there.
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Old 1st March 2008, 11:40 PM   #9
BWRX is offline BWRX  United States
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Get rid of all the copper pours that are not connected to anything. I would suggest trying to make all traces with 45 degree angles only for manufacturing purposes. Also watch for issues with spacing between traces and pads. Your layout has a number of questionable areas where traces appear to be very close to other traces or pads.
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Old 2nd March 2008, 07:34 AM   #10
Paswa is offline Paswa  India
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Quote:
if you route pin 15 under the 1K resistor just below it and around the outside of the board, you can then evenly space your input leads if you wanted to use a standard connector there.
thanks, friend, here it is ---
Click the image to open in full size.
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