Challenge: Can you figure out how this single part boost converter works?
If you think this is easy, then I think you are missing something. This is hard. You need to know your hardware intimately to figure this one out.
Free Less Is More Hacker tee-shirt to the first correct answer in the comments. More details and demo video below…
Blinking Blue- Powering a 3.7 volt LED from a 2.4 volt coin cell with a $0.02 charge pump
Everyone loves blue LEDs and everyone loves coin cell batteries, but if you want to power a blue LED from a coin cell you will need some help. Here is a super-cheap and easy way add a to boost your LED voltage with only an additional capacitor & diode, and a little software.