Add-on dossier

NE555 wrapped-wire blink circuit

A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.

H2HC 2022 Badge source-backed

discrete circuit

The badge used a wooden board, large components, wrapped wire, an NE555 clock signal, and a few cycling LEDs.

Badge context

Related Resources

project page

Security-Bits writeup documenting wooden-PCB construction, wrapped wire, NE555 clock circuit, and LED behavior.

Source trail

Security-Bits.de · retrieved 2026-05-15

Primary writeup source for wooden-PCB construction, wrapped wire, NE555 clock signal, and blinking LEDs.