From the course: Electronics Foundations: Basic Circuits

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RC low pass filter

RC low pass filter

From the course: Electronics Foundations: Basic Circuits

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RC low pass filter

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- A low-pass filter is a circuit that attenuates or reduces any high-frequency components of a signal while allowing the low-frequency components of the signal to pass through. One of the simplest low-pass filters you can build is this RC circuit, consisting of a resistor in series with the output voltage and a capacitor that's in parallel with the output. For low-frequency inputs, the capacitor's impedance will be very large. So the capacitor will block that low-frequency energy from ever traveling down through it. Since the low-frequency signals can't go through the capacitor, the only place left for them to go is through this filter circuit and out through whatever load is attached to it. The low-pass filter allows the low-frequency signals to pass through it. Now, when it gets a high-frequency input, things are a little different. The capacitor will have a much smaller impedance for this high-frequency signal and…

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