2025 Component Abuse Challenge: A Bistable Flip-Flop With A Fuse
The flip-flop is a staple of logic design, used for holding, counting, or shifting bits.
A flip-flop can be created with integrated circuits, transistors, or even relays, but
[b.kainka] has made a functioning set/reset flip-flop using a pair of PTC self-resetting fuses.
The circuit consists of a pair of incandescent bulbs in series, each in parallel with a momentary action switch and a PTC fuse.
- On start-up, both fuses conduct, causing one to go high impedance and light its corresponding bulb.
- The other fuse remains low impedance, keeping its bulb dark.
Author summary: A bistable flip-flop created with PTC self-resetting fuses.
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