In this video, electrical engineer Barron Stone challenges you to use your knowledge of passive RC filters to design a low-pass filter for the audio signal going to a subwoofer. Choose appropriate resistor and capacitor values to achieve the desired cutof
- [Instructor] This is how I worked my way…to a solution for my subwoofer audio filter.…To determine the cutoff frequency of a simple RC filter,…I'll use the equation that the cutoff frequency…is equal to one over two pi RC.…My target cutoff frequency is 150 hertz.…So now I just need to pick values for R and C…that make this equality work.…I'll start the process by picking a resistor first.…Since the audio source has a very small output impedance,…I want to use a fairly large resistance value…to avoid overloading the audio source,…so I'll choose a 10 kiloohm resistor from my parts kit.…
That will give my filter an input impedance…that's significantly larger…than the output impedance of the source…which is only a few ohms.…So it will maximize the transmission…of the voltage signal from the source to my filter.…10 kiloohms is also a small enough value…that it shouldn't significantly impact…the signal transmission from the filter to the amplifier…which has an input impedance of several megaohms.…Now that I've selected my resistor value,…
- Reading electrical schematics
- Building circuits on breadboards
- Reviewing types of static and variable resistors
- Reading resistor color codes
- Measuring resistance with a DMM
- Measuring resistive sensors with an Arduino microcontroller
- Making electrical signal measurements with an oscilloscope
- Measuring AC voltage with a DMM
- Understanding the time domain and frequency domain
- Designing passive low-pass and high-pass filters
- Reviewing reactive RC and RL circuits
- The relationship between capacitors and inductors
Skill Level Beginner
Learning to use MakerBot 3D Printerswith Kacie Hultgren1h 5m Appropriate for all
Learning Arduino: Pulse Width Modulationwith Rae Hoyt1h 16m Intermediate
1. Building Circuits
Read electrical schematics6m 25s
3. Resistive Circuits
4. Oscilloscope Measurements
6. Alternating Current
7. Electrical Signals
8. Reactive Circuits
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