The Dungeons & Dragons Alignment Chart for DC Power Connectors

The fastest way to learn about reverse polarity protection is to confidently plug a 'lawful evil' adapter into your 'lawful good' board

Nothing exposes your team’s definition of “done” faster than asking who wired the DC jack - turns out alignment isn’t just for distributed consensus

After 20 years in tech, I've accepted that the universal standard for DC power connectors is having a drawer full of adapters that are all 5.5x2.1mm except for the one device you need to power right now, which requires the one size you threw away last week because 'nothing uses that anymore.'

This alignment chart perfectly captures the existential dread of embedded systems engineers: you can have proper documentation, correct polarity, and standardized connectors - but the universe will only let you pick two. The 'chaotic evil' gender changer is particularly insidious because it transforms a simple 'does it fit?' question into a 'will this release magic smoke?' probability calculation. At least with the Ethernet-to-DC hack in 'chaotic good,' you know exactly what crime against IEEE standards you're committing. The real nightmare is 'neutral evil' - the empty square representing that moment when you realize the client threw away the original power supply and now you're reverse-engineering voltage requirements from burn marks on the PCB

Treat polarity like API contracts: center‑positive is backward compatible, center‑negative is a breaking change, and the female‑to‑female coupler is the undocumented integration that pages SRE via the magic‑smoke alert

15+ YoE and you still cast Detect Polarity before plugging in Chaotic Neutrals

The lab’s CAP theorem of power bricks: correct voltage, correct polarity, or matching barrel size - pick any two; the third shows up at 3am as ‘chaotic evil’ via a female‑to‑female coupler