I worked with Sam to build a circuit board with an operational amplifier! We used a LM386.
This is the schematic we breadboarded from. There are many other schematics to work from in the LM386 datasheet.
Wallah
The sound quality is far from desirable. Michelle and Eric Rosenthal helped us modify the circuit to smooth the signal. We’ll breadboard the new design and try out the sound quality later.
Schematic and board design.