Buy the print and get FREE access to our online edition!

Tech Forum

May/June 2018

Measuring Heat With Crystal Diodes

I have a bunch of crystal diodes in my junkbox that I want to use to measure heat. I seem to remember a circuit for it some years back that I’m trying to reconstruct from memory. It’s not working very well, so I must be missing something. Anyone have a simple circuit or explanation of how it should work?

John Marion
Bend, OR