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In Reply to: Re: 10W posted by TUBEVIBB on September 11, 2006 at 12:30:12:
All capacitors present an infinite impedance to DC. For an AC signal, impedance is inversely proportional to frequency, according to the equation Z = 1/2*pi*f*C, where the asterisk is meant to indicate multiplication and C is in Farads. Thus, if you put a capacitor in parallel with a resistor, its impedance will be much higher than that of the resistor at low frequencies (so the net impedance of the RC pair will be roughly equal to the value of the resistor alone), and at high frequencies the capacitor will effectively short out the resistor (so the net impedance of the RC pair will approach zero). Where in the frequency range these two different phenomena predominate will be related to the value of the chosen capacitor. This is why I asked how you chose the value for your bypass capacitor.
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Follow Ups
- Yes - Lew 06:59:14 09/12/06 (0)
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