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Old 30th March 2014, 03:15 AM   #1
lexer98 is offline lexer98  Argentina
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Default Another PCB Thread of CarlosFM LM 3886 - HELP

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I can't find any Carbon 0.1 Resistor in my local stores. Wire resistors works ?

Guys what think about the PCB ? Need corrections ?

P.D: Ignore the resistor overlap !

Thanks
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Old 30th March 2014, 05:10 AM   #2
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This is a bit better

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Old 30th March 2014, 11:17 AM   #3
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Hi lexer98,

Maybe most of your answers are here.
LM 3886 PCB Based On Carlos Fm Schemetic

Try to analyse each component for its function and how important its location is, before starting the PCB design.
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Old 30th March 2014, 11:49 AM   #4
AndrewT is online now AndrewT  Scotland
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Why do you want carbon resistors?
The sch you attached does not mention carbon.
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Old 30th March 2014, 03:39 PM   #5
lexer98 is offline lexer98  Argentina
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"Connect top of C3 to bottom of C5 directly by the shortest possible route, even soldering the two pins together.
Connect top of C2 to bottom of C4, using a short trace."

I think the -35 part (2200uF cap, 3,3nF and 100nf) are too far from the chipamp i will try make the traces shorter and use smaller components

In my country the only MKT capacitors i find are like this http://i00.i.aliimg.com/wsphoto/v0/1...32-3-3nf-0.jpg ... really cheapo ¿works ?


Thanks guys !
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Old 30th March 2014, 04:40 PM   #6
AndrewT is online now AndrewT  Scotland
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MKS, MKT, Polyester, Mylar are all the same.

Good for many duties, small and cheap for the values available.
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Old 30th March 2014, 05:20 PM   #7
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Where did CarlosFM mean to place R4/C7, close to the chip or before C2?
I think you can still find the original postings from the master himself explaining his design.
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Old 30th March 2014, 05:26 PM   #8
lexer98 is offline lexer98  Argentina
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Quote:
Originally Posted by Mark Whitney View Post
Where did CarlosFM mean to place R4/C7, close to the chip or before C2?
I think you can still find the original postings from the master himself explaining his design.
I'm following the AndrewT - 12 Tips posted in the thread of Neeraj .. LM 3886 PCB Based On Carlos Fm Schemetic



I Tried to make the shortest possible traces (according to my brain) ..

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Old 30th March 2014, 10:31 PM   #9
lexer98 is offline lexer98  Argentina
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One friend recommend use curve traces and common ground ... also i put one resistor of 10R from InGND to Power GND

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Old 31st March 2014, 04:42 AM   #10
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I think R5 and R9 don't need to be 4W. They are only for a very small amount of HF current.
C9 and C11 need to almost connect at the chips pins to work probably.
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