Geiger counter project! (Or more accurately, Geiger clicky thing). Did this outdoors. Which I have decided is much better for your healrh/lungs than the garage or workbench. Photos... #geigercounter
Despite reading the instructions and schematic carefully, still managed three mistakes in putting this together (fixed). Wrong resistor and the tube clips in the wrong place, and hard soldered the 555 timer instead of soldering the socket. #electronics
@ai6yr Glad to hear 555s are still a thing more than 50 years later. As a teen I built an automatic exposure timer project for an enlarger from a magazine. I had all the parts but the NE555. I found a supplier in Atlanta who sent me one for free.