This is what happens when you let an engineer overcomplicate a problem. We wanted to give students 5 minutes per step during soldering class. So? We made a 5 minute digital timer. Push the button. The LED slowly blinks, getting faster and faster, until at 5 minutes, it’s nearly solid.
We no longer have kits, but do have some pre-assembled with battery.
SMTtimer Assembled $5ea/w battery:
CR1221 Batteries $2/5:
By Charley Jones, PMP
Aka Dataman 8/2012