2024-03-27 (W) RADARBadge 555 Accessory problems

I designed and ordered a 555 flashing accessory, but it did not operate as expected. Instead of oscillating, the light came on for a fraction of a second and then stayed off. I checked my battery, which was too low to function, so I tried a fresh one, but the result was identical. I checked my circuit against other designs, and they suggested a 6V to 12V for the capacitor and resistor values I used. I found a 3V circuit and built it on a breadboard. This circuit has two lights, and I confirmed it will work with a 3V battery, so it should replace the old design.
The venerable 555 flasher circuit

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10

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