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Chip amp decoupling/snubberizing caps
Chip amp decoupling/snubberizing caps
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Old 7th December 2017, 05:21 PM   #1
ggidzinski is offline ggidzinski  United States
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Default Chip amp decoupling/snubberizing caps

I am rounding up the parts for an LM3886 chip amp build. The BOM calls for a number of 0.1uF 63V capacitors decoupling/snubberizing/Zobel. The original BOM calls for polypropylene film box caps. The fit on the board is very tight not allowing for much dimensional deviations and so finding proper parts that are available in the US has been difficult. How important are the use of PP film caps in these functions vs another material like polyester? In the attached schematics they are in the PS as labeled and on Cs/Cs/Cz on the amp board.

Thanks,

George
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Last edited by ggidzinski; 7th December 2017 at 05:36 PM.
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Old 7th December 2017, 05:31 PM   #2
Mooly is offline Mooly  United Kingdom
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Chip amp decoupling/snubberizing caps
Polyester is fine for these applications, which in reality are pretty non demanding in the big scheme of things

If the design was RF rather than audio, or if there were extremely fast repetitive rise times involved then you might be looking to make specific choices... but decoupling and Zobel network duty is all cooking grade design. Use what fits and what is cost effective.
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Old 7th December 2017, 05:33 PM   #3
grimberg is offline grimberg  United States
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George,

What is the lead spacing? Try Wima MKP4 at Mouser. Search for:

MKP4D031002D00KSSD
MKP4D031003C00JSSD
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Old 7th December 2017, 05:37 PM   #4
ggidzinski is offline ggidzinski  United States
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Quote:
Originally Posted by grimberg View Post
George,

What is the lead spacing? Try Wima MKP4 at Mouser. Search for:

MKP4D031002D00KSSD
MKP4D031003C00JSSD
5mm pitch, 5mm x 7.2mm body footprint.
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Old 7th December 2017, 05:40 PM   #5
grimberg is offline grimberg  United States
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How about this one?

MKP2C031001F00JSSD WIMA | Mouser
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Old 7th December 2017, 05:42 PM   #6
ggidzinski is offline ggidzinski  United States
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Quote:
Originally Posted by grimberg View Post
George,

What is the lead spacing? Try Wima MKP4 at Mouser. Search for:

MKP4D031002D00KSSD
MKP4D031003C00JSSD
Thank you, your suggestion sent me back to the PCBS where I just noticed that ther are additional through holes that allow for 7.5mm pitch. Open your eyes grasshopper and see what lies before you.

George
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Old 7th December 2017, 05:43 PM   #7
grimberg is offline grimberg  United States
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Sorry, did not notice they are out of stock until April 2018.
How about this one?

MKP2D031001F00JO00 WIMA | Mouser
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Old 7th December 2017, 05:45 PM   #8
grimberg is offline grimberg  United States
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Great! The option of 7.5 mm lead spacing increases the chances of finding one.
On Mouser search for MKP and then select the additional parameters.
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Old 7th December 2017, 06:01 PM   #9
Mark Whitney is offline Mark Whitney  Netherlands
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I think this is the one used by chipamp.
BFC241641004 Vishay / BC Components | Mouser Europe
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Old 7th December 2017, 06:49 PM   #10
nigelwright7557 is offline nigelwright7557  United Kingdom
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Audio is usually fairly forgiving so polyester will be ok.
What is more important is having decoupling gas close to chip amp as possible.
The path through the feedback resistor should be as short as possible.
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