He already had experience using the Mitsubishi PS21245-E IGBT inverter ... Maybe [Mark] can compare notes with the Open Source Turbomolecular Pump Controller that we featured some time back.

It’s the Everyman’s Turbomolecular Pump, a pump based on one of [Nikola Tesla]’s patents. It sucks, and that’s a good thing. The usual way of sucking the atmosphere out of electron ...