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Voltage sensitivity of ceramic capacitors
Interesting thread over in rra.boatanchors suggesting that
ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. |
#2
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Voltage sensitivity of ceramic capacitors
Brian Morrison wrote:
On Sat, 27 Oct 2018 12:59:58 +0100 Gareth's Downstairs Computer wrote: Interesting thread over in rra.boatanchors suggesting that ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. Well known in SM caps with higher dielectrics, it's essentially a piezo-electric effect. Noticeable in PLL loop filters, a voltage transient on a tuning step can be considerably extended and in extreme cases will be microphonic. I was under the impression you shouldn't use them in the signal path, just for bypassing. More expensive and bulkier technologies are needed for big signal capacitors. -- Roger Hayter |
#3
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Voltage sensitivity of ceramic capacitors
Roger Hayter wrote:
Brian Morrison wrote: On Sat, 27 Oct 2018 12:59:58 +0100 Gareth's Downstairs Computer wrote: Interesting thread over in rra.boatanchors suggesting that ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. Well known in SM caps with higher dielectrics, it's essentially a piezo-electric effect. Noticeable in PLL loop filters, a voltage transient on a tuning step can be considerably extended and in extreme cases will be microphonic. I was under the impression you shouldn't use them in the signal path, just for bypassing. More expensive and bulkier technologies are needed for big signal capacitors. The true purist does not use capacitors in the signal path. All DC-coupled amplifiers. |
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Voltage sensitivity of ceramic capacitors
"Michael Black" wrote in message news:alpine.LNX.2.20.1810271206170.5141@thrush... On Sat, 27 Oct 2018, Gareth's Downstairs Computer wrote: Interesting thread over in rra.boatanchors suggesting that ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. Since it's audio, won't the capacitance values be high enough that you're more likely to use electrolytics in the audio path? Michael If it is amateur radio audio, probably not. PA |
#5
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Voltage sensitivity of ceramic capacitors
On Sat, 27 Oct 2018, Gareth's Downstairs Computer wrote:
Interesting thread over in rra.boatanchors suggesting that ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. Since it's audio, won't the capacitance values be high enough that you're more likely to use electrolytics in the audio path? Michael |
#6
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Voltage sensitivity of ceramic capacitors
Rob wrote:
Roger Hayter wrote: Brian Morrison wrote: On Sat, 27 Oct 2018 12:59:58 +0100 Gareth's Downstairs Computer wrote: Interesting thread over in rra.boatanchors suggesting that ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. Well known in SM caps with higher dielectrics, it's essentially a piezo-electric effect. Noticeable in PLL loop filters, a voltage transient on a tuning step can be considerably extended and in extreme cases will be microphonic. I was under the impression you shouldn't use them in the signal path, just for bypassing. More expensive and bulkier technologies are needed for big signal capacitors. The true purist does not use capacitors in the signal path. All DC-coupled amplifiers. For communication purposes (and for any real speakers) then you need a massive HPF to make the signal usable. -- Roger Hayter |
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Voltage sensitivity of ceramic capacitors
In message , Gareth's Downstairs Computer
writes Interesting thread over in rra.boatanchors suggesting that ceramic capacitors' capacitance is voltage sensitive and thus responsible for distortion in the audio path. Correct. They are piezo-electric by nature. The also exhibit dielectric absorbance which is Bad News if you use then in a peak detector or sample and leak ^H hold. Silver mica or polypropylene is better. Some ceramic dielectrics also vary wildly with temperature which can also give grief and sorrow. I imagine that a combination of dielectric absorbance and capacitance change will give audio distortion B -- Brian Howie |
#8
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Voltage sensitivity of ceramic capacitors
Il se trouve que Brian Morrison a formulé :
Well known in SM caps with higher dielectrics, it's essentially a piezo-electric effect. Noticeable in PLL loop filters, a voltage transient on a tuning step can be considerably extended and in extreme cases will be microphonic. +1 AFAIK ceramic capacitors are never used in audio except for RF bypassing and in parralel with other types of capacitors. |
#9
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Voltage sensitivity of ceramic capacitors
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