I introduced Ampacity on December 12, 2012. The inspiration came from neon signage, and specifically from the lettering on Led Zeppelin’s Coda album cover. That design had a quirk: the thick stroke on the “A” was placed on the opposite side from where you’d normally expect. When I built Ampacity, I flipped it to the conventional side but included a mirrored alternate for anyone who wanted to recreate the original look.

The name is a portmanteau of “ampere” and “capacity,” chosen to suggest electricity and the energy of neon light. By the time I made it, I had already designed two other Led Zeppelin–related typefaces, and this felt like the only remaining option for rounding out that set.

Ampacity was released with stylistic alternates and a mirrored version, but I’ve never seen it used in the wild, and I didn’t get any response when it came out. On May 12, 2021, I updated the font to improve the stylistic alternates feature, making it accessible in programs like InDesign (via Stylistic Set #1). I also removed deprecated characters such as L with dot and E with breve, and expanded OpenType fractions to handle longer numerators and denominators.

I never pursued the neon aesthetic again, so Ampacity stands alone in my catalog as a one-off exploration.