I actually "finished" a personal project! Thanks for all the help!

[Fish-in-a-barrel]

My nixie tube clock is up and running! Sure, the software is a mess, the boards are hacked together, and I don't dare leave it running if I'm not in arm's reach of the plug... but it's running!

Considering my starting point was, "I don't really understand how a MOSFET works," this was a lot for me to take on. This forum and it's lovely people were invaluable! I think it's rare to find such a helpful community on the web. Thank you all!

Some bullet points on the project:

• 12 Nixie tubes for date/time
• Each tube has its own driver board with an MCU acting as an I2C client
• Main controller board generates 180V for the nixie supply with a boost converter
• USB PD for power
• Micro OLED and rotary encoder for status display and user input (DST, time zone setting)
• GPS for date/time initialization
• Hardware RTC for precise time-keeping and power-off time-keeping

Honestly, the boost converter was the hardest part. I burned up several MOSFETs and diodes when my control strategy failed to keep the voltage in check.