I minored in music while attending UC Berkeley, and in the Spring of 2022 I made a guitar amplifier in an instrument design class using my new knowledge of circuits. I built everything by hand, sourcing the parts myself and using the makerspace in Jacobs Hall. The amplifier produces noise-free clean and overdriven guitar tones with an LM386 op-amp. There is also an internal Piezo microphone for producing a feedback loop. Below is a demo video of how the amplifier works, and the sounds that it can produce.
You can navigate on the side to see some pictures and descriptions of the process of building the amplifer.