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effects from coupling capacitors in audio circuits



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The video shows the "bandpass" from different capacitor values used as coupling capacitor in audio circuits (20 Hz - 20 KHz). The "sound" changes completely with different values, and 1 series capacitor in the audio signal line can be used as audio filter (though the characteristic is far from ideal, complete audio bands are shut off, so not very selective!).

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https://youtu.be/xbgQ8T3oqh4
In thematic order you can find these video’s under the “comments” section.
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Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics) and important adaptations to the circuits.

Be aware of that, I saw on the internet my circuits reproduced in a poor or even not proper way. I can not help that, sorry.

More audio in my book: "Schematics 2, audio amplifiers and loudspeaker boxes" ISBN 978-1-4475-7336-4. You can find it via the above mentioned link to LULU.

Please note: the capacitor value and its effects also depends on the input resistance from the electronic stage to which it is connected (4-pole-theory). This means that with a high-impedant input stage (like a tube grid or a FET gate), the effects will be (somewhat) else. In the showed demo the input resistance is approx. 3-4 K (bipolar transistor). This low impedance input gives damping. Updated 1 June 2019.
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Audio
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