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Old 30th September 2008, 07:18 AM   #1
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Default 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
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Old 1st October 2008, 01:21 AM   #2
BWRX is offline BWRX  United States
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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.
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Old 1st October 2008, 06:58 AM   #3
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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
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Old 1st October 2008, 11:19 AM   #4
BWRX is offline BWRX  United States
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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.
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Old 1st October 2008, 01:37 PM   #5
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Thanks, I will search for 5% caps (0805 package). It seems that I have the caps with 20% tolerance.

Mark
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