guys in a amplifier circuit a 2.2μF(3v) capacitor is used to input the signal to the amplifier,but i have a 2.2μF(16v) capacitor!can i use that 16V capacitor,will there be any minor problems!please help me guys!
I have never read or heard this one before. It was my understanding that if you are using a polarized capacitor, you never want to apply anything to it that causes a "reverse polarity" condition to occur across the cap.However in the case of polarized capacitors (electrolytics), the capacitor is designed to be polarized or biased with the rated working DC voltage. They do not work well at lower polarizing voltages ( of course not higher either).
This is true and not inconsistent with what I said.THAT IS TO SAY, that if you have a 16 volt cap, and you bias it with 5 volts, you should not apply a sine wave greater than 5 volts peak to peak as this would cause the cap to see reverse polarity.
I then questioned this by saying:However in the case of polarised capacitors (electrolytics), the capacitor is designed to be polarised or biased with the rated working DC voltage. They do not work well at lower polarising voltages ( of course not higher either).
Then you said:I have never read or heard this one before. It was my understanding that if you are using a polarized capacitor, you never want to apply anything to it that causes a "reverse polarity" condition to occur across the cap.
THAT IS TO SAY, that if you have a 16 volt cap, and you bias it with 5 volts, you should not apply a sine wave greater than 5 volts peak to peak as this would cause the cap to see reverse polarity.
First you said that polarized caps must be operated with a bias voltage that equals their rated voltage. I then questioned this, offering the example of operating one at much less than it's rated voltage. You then agreed, then in the same post disagreed with "why would there be 3V, 16V, ... 150V ... 1500V electrolytics".This is true and not inconsistent with what I said.
If you think about it why would there be 3V, 16V, ....150V...1500V electrolytics?
Why not simply use 1500V caps for everything?
Because 1500V caps are designed to be run with a DC potential (or bias or voltage) of 1500 volts across them.
We also have 3V etc caps because 1500V caps do not perform well at lower voltages.
And if you don't bias it at all as in the OP/s circuit it will soon fail.