Op Amps: Pocket Rockit Personal Amplifier, Part 1

The Pocket Rockit is a small, personal amplifier that I designed in the mid-to-late 1980s. The idea was to make a musician's "Walkman" (remember those?). At one end, you'd plug in your guitar, bass, or electronic keyboard; and at the other end, a pair of headphones. It's powered by a single 9 volt battery (or DC wall wart) and features controls for volume, distortion, brightness, and a three band EQ. A simplified version was featured in an article I wrote for Guitar Player Magazine around that time. Part one describes the overall design and features of the device. Subsequent parts dive into specific subcircuits. This circuit is NOT in the public domain. I still claim rights to it, although I am releasing it with my usual Creative Commons license (NC-SA-BY: non-commercial, share-alike with attribution). You can use it for educational or personal use. FYI, other parties have produced devices called the Pocket Rocket, Pocket Rockit, or similarly spelled variations. This device is not related to any of them, and to the best of my knowledge, was the first device of its type with this name. The "Rockit" spelling came about as I had planned on making it a DIY kit, but that never came to fruition. References: Operational Amplifiers: Theory and Application, Chapter 6 et al. My free texts and lab manuals are available for download at my college web site https://www.mvcc.edu/jfiore and at my personal site http://www.dissidents.com Inexpensive print and kindle copies are available at Amazon https://www.amazon.com/author/jimfiore If you like my texts and videos, and would like to help defray the costs of making and maintaining them, consider making a modest donation at https://www.buymeacoffee.com/Professo...