Quote:
Originally posted by akis
You have connected both Vcc+ pins on the chip, is that needed? I am gemnuinly curious because I have not bothered to connect one on mine, I could not fit in a thick trace so I thought why bother.
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Even if they are internally connected, they should both be connected unless otherwise specified. A possible reasons for two pins could be current sharing. Or it could have to do with the temperature distribution in the package. If there was no reason, the designer would have saved the work and the additional connection.
Quote:
Originally posted by Razor_x
Is this going to affect the sound 
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Could be. The coil will inductively couple its signals into neighboring traces and components and vice versa.
Quote:
Originally posted by Razor_x
Will different lengths of power rails affect working of amplifier? How would you solve this on my PCB?
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In theory, yes. In practice you might not notice the difference.
Have a look at National's reference designs for LM1876, 4765, 4766 (homepage) or 4780 (datasheet). You could copy the way it is done there. You will find that the 100 nF decoupling capacitors are very near to the IC's power supply pins, and that the supply capacitors are physically located in a certain pattern. The bigger the capacity, the further away from the IC they are.
Look also, how the grounding is done there and how the designer tried to avoid running certain traces in parallel and how traces cross each other at right angles, where possible.
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If you've always done it like that, then it's probably wrong. (Henry Ford)
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9th July 2009, 08:33 PM
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