Clear flexible printed circuits - first success

I'm making flexible printed circuits with my vacuum deposition machine. In this video, I show my first successful active circuit built with copper deposited onto laser printer transparency sheets. My ultimate goal is to make thin film transistors and OLEDs that are deposited onto the substrate.

Intro to heat treatment of steel (hardening and tempering)

I try to bridge the gap between in-depth theoretical explanations of heat treatment, and rote tradition.

Detectron DG-2 geiger counter teardown and testing

I take apart a Detectron DG-2 geiger counter, and discover the circuit still works after 60 years!

Explanation of how kilowatt-hour meters work (electromechanical)

I take apart an electromechanical power meter and describe how it uses magnetic fields to measure power consumed.

Custom supercritical CO2 chamber with easy-to-use lid clamp

I built another supercritical CO2 chamber for extraction and drying. This time, I wanted a chamber that was easier to open and close, and could be expanded to larger volumes with the same closure system. The chamber is built from 2" OD .25" wall stainless steel, and I welded a plug into one end and a ring with O-ring gland onto the other.