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LM4780 stereo Power-amp PCB design
LM4780 stereo Power-amp PCB design
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Old 28th August 2010, 08:04 AM   #11
thepcman is offline thepcman
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Ok how about this one then?
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Old 28th August 2010, 10:55 AM   #12
AndrewT is offline AndrewT  Scotland
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for effective attachment of the heatsink the Chipamp should be at or near the edge of the PCB.
The decoupling caps C6 C1 have a very dirty current between their Zero Volt pins.
Do Not place any Ground Reference on this linking trace.

Why is V- separate from V+?

Look at the route from pin4 to C5 to C2 to pin9. That route must be at least 10times the length of the route from pin 4 to pin 9. That type of routing can be avoided by using the single amp version, lm3886.
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Old 28th August 2010, 11:56 AM   #13
thepcman is offline thepcman
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V- is a bit apart from V+ so that i can keep up with star ground with the single layer PCB, the real distance is 1 inch (2.54 cm)

You are correct that C1 & C6 are very distant, for that reason, i placed C2, C3, C4 and C5 as close as possible to IC, they have the values 10u and 100n.

I did not understand the idea behind the route length constraint you said, can you explain the reason please?

Meanwhile i will try a bridged version
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Old 28th August 2010, 11:57 AM   #14
donpetru is offline donpetru  Romania
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Is not good as you used jumpers behind LM4780. There must come amplifier heatsink and should not sit on jumpers. Is not good. Try again or pay someone to do it.

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