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previous: John I have seen low imp circuits that u... -- 3/2/2000 12:53 AM

Re: high imp caps?

3/2/2000 1:55 AM
R.G.	Re: high imp caps? The impedance of a capacitor is Xc=1/(2piFrequency*capacitance) That is - a capacitor has no impedance until you specify a frequency. Once you do that, the impedance of the capacitor is determined. At that point, you can decide whether you need a bigger or smaller capacitance, depending on the other parts in your circuit and the frequency range over which it operated. In general, a bigger capacitance will have a lower impedance at every given frequency than a smaller capacitance, but you have to know what you're trying to achieve, and what the other parts in your circuit do before you can decide how much is enough. Let me encourage you to do some reading on basic electronics. There are some good books in every public library, as well as some excellent basics teaching places on the net.

3/2/2000 1:55 AM

R.G.

Re: high imp caps?

The impedance of a capacitor is Xc=1/(2*pi*Frequency*capacitance)

That is - a capacitor has no impedance until you specify a frequency. Once you do that, the impedance of the capacitor is determined. At that point, you can decide whether you need a bigger or smaller capacitance, depending on the other parts in your circuit and the frequency range over which it operated.

In general, a bigger capacitance will have a lower impedance at every given frequency than a smaller capacitance, but you have to know what you're trying to achieve, and what the other parts in your circuit do before you can decide how much is enough.

Let me encourage you to do some reading on basic electronics. There are some good books in every public library, as well as some excellent basics teaching places on the net.