One of the areas I'm most amped (haha) about personally is learning how to create instruments/synthesizers and exploring ways for interacting with sound. This "Atari Punk Console" might be a good place to start. As I understand, it is essentially the same circuit earlier published by autodidact scientist and electronics author extraordinaire Forrest M. Sims III as a "Stepped Tone Generator". It uses what Sims calls "one of the most popular integrated circuits ever designed", the "venerable 555 timer designed by Hans R. Camenzind for Signetics" in 1972. (To be honest, this has me truly thinking about "authorship" of circuits for the first time.) This project also shows how DIY style electronics projects often naturally become collaborations across time and space: Camenzind's 555 IC (1972) > Sims' Stepped Tone Generator (1984) > Kaustic Machines' "Atari Punk Console" > MAKE Magazine's Collin's Lab (above) + hordes of circuit modding synth-heads all over...