I realized the site I was on was a horribly overpriced site. PCBway ended up being much cheaper.

That other site was around $500 so much more reasonable for 5 pcbs. Originally I had assembly also (which was surprisingly cheap around $30 + materials which would save a bunch of time) but I ended up ditching that because the kicad bill of materials format didn’t match PCB way and I gambled that the amount of time it would take me to fix would probably take the same amount of time to just solder it up myself (I assume it will be quicker/easier than perf board).

I also touched up the pcb before ordering:

(NO bottom resistors!) I also removed the vault boy picture. The font was too small and looked like SSS instead of 555 and I wanted my website listed somewhere.

I’m still a bit skeptical this will work after I solder it up:

1.) I just kinda threw a diode in there and didn’t consider power

2.) I’ve done zero testing of the mixing circuit (I want to swap resistors R9 – R12 for potentiometers to essentially EQ the output, as each of the 555 timers are outputting across a frequency band)

3.) The traces seem thin? I feel like they need to be thicker but at the same time I’m at such Low frequencies maybe I’m fine.

For the next rev:

1.) Add usb-c power

2.) Adding a audio jack output would be cool

3.) Adding a potentiometer instead of a F_CTRL pin would be nice

4.) Adding volume on output would be cool