mknott:
If you use a polarized capacitor, then the + sign needs to be connected to the more positive node in the circuit. If you use a non-polarized capacitor, then polarity obviously doesn't matter. Non-polarized capacitors are rarer, bigger, and more expensive than polarized ones.
MikeMl:
You are mixing descriptions; there are bypass capacitors (such as an emitter bypass in a transistor amplifier), and then there are coupling capacitors (such as coupling between stages of amplification, if the DC level at the source is different than at the destination).If you use a polarized capacitor, then the + sign needs to be connected to the more positive node in the circuit. If you use a non-polarized capacitor, then polarity obviously doesn't matter. Non-polarized capacitors are rarer, bigger, and more expensive than polarized ones.
mknott:
Aha. So it boils down to a question of cost then. Oh well, at least I can stop searching for some magical property related to polarity and move on to the next problem with my project. ...
crutschow:
And size. Non-polar capacitors are generally physically much larger than polar (electrolytic) caps.
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