In this video, electrical engineer Barron Stone demonstrates his solution to the audio filter challenge, walking you through his thought process from start to finish.
- [Instructor] It's time for another challenge.…I just got a new subwoofer for my audio system.…A subwoofer is a speaker that's specifically designed…to play really low base frequencies,…typically in the range below 100 to 200 hertz.…I need your help designing a filter…to place between my audio source…and the amplifier for my subwoofer,…to make sure it only gets low-frequency signals.…Your goal for this challenge…is to design a passive RC filter…consisting of a single resistor and a single capacitor.…
Your filter should attenuate the frequency components…of an input signal…that are above a minus three dB cut-off frequency…of around 150 hertz.…I'll allow for some flexibility in the requirements,…so you can stick with using common resistor…and capacitor values.…As long as the cut-off frequency is within…plus or minus 10 hertz of the target,…I'll consider that close enough.…You should expect the output impedance of the audio source…to be very low, maybe just a few ohms,…and you should expect the input impedance for the amplifier…
- 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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