BasicB-005-010-008
What property allows a bypass capacitor in an audio circuit to divert an interfering RF signal?
D
Answer
Transmitters, receivers, and measurements
Type
A
High reactance at audio frequencies
B
Low reactance at audio frequencies
C
High reactance at radio frequencies
D
Low reactance at radio frequencies
Answer Notes
Capacitive reactance is inversely proportional to frequency, meaning as frequency goes up, reactance (opposition to alternating current) goes down. Radio frequencies (RF) are significantly higher than audio frequencies.
Because of this property, a capacitor exhibits very low reactance to RF signals. This creates an easy path for the high-frequency interference to flow to ground, effectively diverting it away from sensitive audio components while leaving the audio circuit intact.
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What property allows a coil wound on a ferrite core to mitigate the effects of an offending radio signal?
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What property allows an RF bypass capacitor to have little effect on an audio circuit?