Electrical Engineering › Section N · Decibels, filters, and Bode plots › Topic N.2
R-C low-pass and high-pass filters
One resistor and one capacitor are enough to pass low frequencies and block high ones, or the reverse. These simple filters clean up sensor signals, remove hum and set the bandwidth of countless circuits, and their behaviour follows from a single cutoff frequency.
In this topic
- What a filter does
- The R-C low-pass circuit
- The transfer ratio and the cutoff frequency
- Beyond the cutoff
- Worked example: a low-pass filter
- The R-C high-pass circuit
- Worked example: removing mains hum
- R-L versions and choosing a filter
- Common mistakes to avoid
- Key takeaways
This topic is part of Wuanberri Pro. Checking your access…