I put a flux capacitor together in 2005 from a 555 timer, 3 decade counters, and 30 yellow LEDs and mounted it in the back of my Jeep by the spare tire. Do recommend [1].<p>[1] <a href="https://partofthething.com/thoughts/my-old-flux-capacitor-project/" rel="nofollow">https://partofthething.com/thoughts/my-old-flux-capacitor-pr...</a>