SMT capacitors for audio

Markus2006 · 30th September 2008, 07:18 AM

I need your advice regarding SMT capacitors for audio. I'm building a guitar preamp (SMT version), in which there is a filter. It seems to me that ceramic capacitors are not good. I consider WIMA polyester (or polyethylene) capacitors: http://www.wima.com/EN/smdpet.htm . What do you think?

Mark

BWRX · 1st October 2008, 01:21 AM

What capacitance values are you looking at using? C0G/NP0 ceramics should be fine for use in a filter. The metallized polypropylene ones you linked to look nice as well. They're probably pretty expensive though.

Markus2006 · 1st October 2008, 06:58 AM

The values are: 470p, 220n, 33n, 22n, 1u. Since this is a filter, the caps should have correct values. The problem is that, for example, ceramic caps 220n have measured value something like 195n (which may change freqency plot of the filter).

Mark

BWRX · 1st October 2008, 11:19 AM

The C0G/NP0 ceramics are available in tight tolerances (1%, 2% are common). Depending on the package size you're looking for, you could probably only find C0G/NP0 caps for the 470p and maybe the 22n and 33n values.

Markus2006 · 1st October 2008, 01:37 PM

Thanks, I will search for 5% caps (0805 package). It seems that I have the caps with 20% tolerance.

Mark

30th September 2008, 07:18 AM	#1
Markus2006 diyAudio Member Join Date: Jan 2006 Location: Poland	SMT capacitors for audio I need your advice regarding SMT capacitors for audio. I'm building a guitar preamp (SMT version), in which there is a filter. It seems to me that ceramic capacitors are not good. I consider WIMA polyester (or polyethylene) capacitors: http://www.wima.com/EN/smdpet.htm . What do you think? Mark

1st October 2008, 01:21 AM	#2
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	What capacitance values are you looking at using? C0G/NP0 ceramics should be fine for use in a filter. The metallized polypropylene ones you linked to look nice as well. They're probably pretty expensive though. __________________ Brian

1st October 2008, 11:19 AM	#4
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	The C0G/NP0 ceramics are available in tight tolerances (1%, 2% are common). Depending on the package size you're looking for, you could probably only find C0G/NP0 caps for the 470p and maybe the 22n and 33n values. __________________ Brian

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1st October 2008, 06:58 AM	#3
Markus2006 diyAudio Member Join Date: Jan 2006 Location: Poland	The values are: 470p, 220n, 33n, 22n, 1u. Since this is a filter, the caps should have correct values. The problem is that, for example, ceramic caps 220n have measured value something like 195n (which may change freqency plot of the filter). Mark

1st October 2008, 01:37 PM	#5
Markus2006 diyAudio Member Join Date: Jan 2006 Location: Poland	Thanks, I will search for 5% caps (0805 package). It seems that I have the caps with 20% tolerance. Mark

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