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Chip Amps Amplifiers based on integrated circuits

First pcb.
First pcb.
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Old 28th June 2009, 11:08 PM   #1
ambed is offline ambed  Latvia
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Default First pcb.

Its actually no my pcb, i found it on internet and i made some changes. Can you tell something about pcb? thanks.
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Old 29th June 2009, 08:38 AM   #2
jazzman06 is offline jazzman06
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i know where d you found this! and what changen do yoy do? at the beggining it' very good pcb without any changes
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Old 29th June 2009, 09:31 AM   #3
peranders is offline peranders  Sweden
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First pcb.
Personally I would place the star ground under the output filter.
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Old 29th June 2009, 09:10 PM   #4
ambed is offline ambed  Latvia
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i think it will be werry dificult move v-gnd under output filter,I can move this point for some mm to right side, nearer to output. what you say about this?
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Old 29th June 2009, 09:38 PM   #5
bbp is offline bbp  China
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Quote:
Originally posted by ambed
i think it will be werry dificult move v-gnd under output filter,I can move this point for some mm to right side, nearer to output. what you say about this?

two 470uF capacitor are needed near the CHIP for PSU bypassing
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Old 30th June 2009, 02:35 PM   #6
ambed is offline ambed  Latvia
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and now will be better??
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Old 30th June 2009, 03:15 PM   #7
pacificblue is offline pacificblue  Germany
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Quote:
Originally posted by ambed
i think it will be werry dificult move v-gnd under output filter
No. It would actually make most ground traces shorter and the overall layout cleaner.
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Old 1st July 2009, 07:00 AM   #8
ambed is offline ambed  Latvia
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maybe you can give some good layout which I can a little bit remake ?
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Old 1st July 2009, 11:12 AM   #9
ambed is offline ambed  Latvia
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Which ground are better star or ground like in pcb??
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Old 1st July 2009, 12:14 PM   #10
pacificblue is offline pacificblue  Germany
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That question is a bit unspecific. Any ground scheme is a compromise of several aspects, so you have to define in which aspect you want it to be better.
Better in stability, ease of implementation, economy, etc.

Usually you strife to have the shortest possible path from each component to a star-point at the lowest potential (0V). However the layout will not always permit for the shortest path to every single component. Using a dedicated wire from each component to that point is often not practical. Many wires are also more expensive than few wires, and they take a lot of time to connect and arrange. They also form nice antennas to pick up disturbances from the surroundings.
On the other hand it is not good to unite all return paths in a single wire, because the combined currents lead to a voltage drop across that wire, which means that the ground reference is shifted from 0 V. Signal linearity will be affected negatively by that.

Conclusion is, you have to find the best compromise for your specific project. Start by drawing a star-ground scheme. Then group the ground returns according to their character. E. g. power ground, signal ground or clean, dirty, etc. Analyze, which currents can be combined according to their character and, which currents combined are low enough to not produce a big voltage drop across the wire and which references must absolutely be at the same potential, thus must be combined into a single wire. Then you can form sub-stars e. g. on a PCB.
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