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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Need an opinion on layout of LME49713 preamp
Need an opinion on layout of LME49713 preamp
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Old 22nd October 2019, 04:34 AM   #61
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by sonidos View Post
So I took a stab at what you folks have recommended but not sure I got it quite right.
From the point of view of containing the common-mode currents the extra split in the groundfill is a step backwards - now they have to go around the board between input and power supply GNDs. Best practice EMC-wise is having all ins/outs along one edge of the PCB - admittedly this doesn't produce eye-candy in terms of layout.
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Old 24th October 2019, 03:39 AM   #62
sonidos is offline sonidos  United States
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Need an opinion on layout of LME49713 preamp
abraxalito,

Ok, I thought I had followed the last set of instructions correctly, but I will review the most recent comments and make changes. I appreciate the comments from you and rayma.
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Old 24th October 2019, 04:10 AM   #63
rayma is online now rayma  United States
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The output can easily be placed above the input, by moving R4 to above R1,
and moving the output connector to the left of R4, above the input connector.
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Old 24th October 2019, 04:20 AM   #64
sonidos is offline sonidos  United States
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Need an opinion on layout of LME49713 preamp
Ok, I'll make the changes. I see what abraxalito is saying about that slot I placed there. The other changes are easy enough. BTW, test socket on the way. I still have to get the right probe. My current one doesn't have the needed bandwidth. It falls way too short for measuring this chip. (note to self: next time, pick an op amp easier to work with)
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Old 24th October 2019, 08:10 AM   #65
jan.didden is online now jan.didden  Europe
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Javier, you could also consider going to a 2-layer board. Cost probably isn't much different these days and the extra layer could provide an unbroken ground layer.

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Old 25th October 2019, 02:18 PM   #66
Mark Tillotson is online now Mark Tillotson
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Its a good idea to use 2-layer board anyway to get the mechanical solidity of thru-plated holes - no more pad-lifting!
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Old 25th October 2019, 04:07 PM   #67
sonidos is offline sonidos  United States
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Need an opinion on layout of LME49713 preamp
Whoops, I better clarify a point about the layouts I'm posting. I'm using an older version of Sprint Layout, and this is designed to be a 2 layer board. Green is the bottom layer and blue traces are on the top layer. There is no fill on the top layer because there is some bug that was causing it to fill in areas that were tied to the voltage rails, so would cause a short. Components will be on top side. I was planning on doing some fill manually after component layout was finalized.
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Old 28th October 2019, 01:25 AM   #68
sonidos is offline sonidos  United States
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Need an opinion on layout of LME49713 preamp
Here is the top layer. After going through several changes, I was able to remove the issues when filling in the top layer.
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File Type: jpg top-layer49713.JPG (201.0 KB, 98 views)
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Old 28th October 2019, 01:28 AM   #69
sonidos is offline sonidos  United States
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Need an opinion on layout of LME49713 preamp
Bottom layer (ground)
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File Type: jpg gnd-layer49713.JPG (113.3 KB, 93 views)
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Old 28th October 2019, 01:37 AM   #70
rayma is online now rayma  United States
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Very good.
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