Join Barron Stone for an in-depth discussion in this video ✓ Solution: Audio equalizer, part of Electronics Foundations: Semiconductor Devices.
- This is how I worked my way to a solution…for the audio equalizer challenge.…I started by thinking about what each part…of the equalizer needed to do,…and then picking op-amp circuits…as building blocks to accomplish those tasks.…For the two filter blocks, I decided to use…a basic op-amp filter circuit…that consists of an RC low-pass or high-pass filter…connected to an op-amp unity gain buffer.…And for combining the two equalizer signals…back together at the end,…that's a perfect application…for an op-amp summing amplifier.…
With those two blocks in place,…I just needed to figure out how and where…I wanted to include the ability to control…the gain for each equalizer band.…One possibility that I considered was using rheostats,…which are manually controllable variable resistors,…as each of the input resistors…on the final summing amplifier stage.…While that seemed like a viable solution at first glance,…I quickly realized that I would run into problems…when I lowered either input resistance too much.…For example, if I turned the rheostat…
- Semiconductor materials
- Diode applications
- Rectifying a signal
- Detecting the signal peak
- Protecting against large signals, reverse current, and flyback voltage
- Special purpose zener diodes, Schottky diodes, and photodiodes
- NPN and PNP bipolar junction transistors
- Using a BJT as a switch
- Field effect transistors
- Differences between BJTs and MOSFETs
- Operational amplifiers
- Op-amp applications
- Comparing signals
- Buffering signals
- Amplifying signals
- Filtering signals
- Combining signals
Skill Level Intermediate
Learning to use MakerBot 3D Printerswith Kacie Hultgren1h 5m Appropriate for all
2. Diode Applications
3. Special Purpose Diodes
4. Bipolar Junction Transistors
5. Transistor Applications
6. Field Effect Transistors
7. Operational Amplifiers
Feedback circuits6m 30s
8. Op-Amp Applications
Next steps1m 9s
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