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 one using a pair of PTC self-resetting fuses.
The circuit consists of two incandescent bulbs in series, each in parallel with a momentary action switch and a PTC fuse.
On start-up both fuses are conducting, so one or other of them will do its job as a fuse and go high impedance.
- One bulb will light up, while the other remains dark due to the difference in fuse impedance.
Author's summary: Flip-flop made with PTC fuses.
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