Hacker News: krauseler

New comment by krauseler in "Muxcard, a DIY credit card size computer"

krauseler — Wed, 03 Jun 2026 01:09:11 +0000

Love how the point of this entire thing comes across!

New comment by krauseler in "Muxcard, a DIY credit card size computer"

krauseler — Wed, 03 Jun 2026 01:08:15 +0000

The PCB can be way smaller, but finding a flexible screen is the issue, there is a 2.9 inch one almost twice as big but the battery would suffer :/

New comment by krauseler in "Muxcard, a DIY credit card size computer"

krauseler — Tue, 02 Jun 2026 14:09:20 +0000

Fair enough, but I acknowledged that and it's 0.24mm thicker if we want to be exact. Here's a quote from my Git Repo:

"Official ISO7816 smartcards are specified at 0.76mm thickness, but many real-world cards slightly exceed this in practice. The target for this project was simple: Stay around ~1mm total thickness and preserve the illusion of a normal card."

New comment by krauseler in "Muxcard, a dyi credit card size computer"

krauseler — Tue, 02 Jun 2026 12:15:37 +0000

Good point. Ideally it would be the opposite of waste if it can save you from several cards. But banks would never certify such a multi-card system unless a big company pushes it forward.

Otherwise I'm sure people might use this to hack some terminals :P

New comment by krauseler in "Muxcard, a DIY credit card size computer"

krauseler — Tue, 02 Jun 2026 12:11:46 +0000

Developer here :)

Just saw this and love how I got the 100th or so "Does it run DOOM?". Even now officially an issue on GitHub. Does that mean I now have to deliver?

New comment by krauseler in "Muxcard, a dyi credit card size computer"

krauseler — Tue, 02 Jun 2026 12:09:14 +0000

Right, it doesn't compute. Apologies for the lie.

New comment by krauseler in "Muxcard, a DIY credit card size computer"

krauseler — Tue, 02 Jun 2026 12:08:37 +0000

I've got the question like 100 times easily, and I love it.

And yes, if you accept ~0.7FPS

New comment by krauseler in "Muxcard, a DIY credit card size computer"

krauseler — Tue, 02 Jun 2026 12:08:04 +0000

Hey, developer here :)

I used an ultra thin LiPo, so you can actually charge it. USB is obviously not an option but it uses magnetic pogo pins on the back side ^^