What is a variable frequency drive? Heating, ventilation, and air conditioning systems' air supply used to be constant volume into a space. Now a variable air volume control is being used to provide ...

Reddit user [InThePartsBin] found some VFDs (Vacuum Fluorescent Displays) on an old PCB on eBay. The Russian boards date from 1987 and have a bunch of through-hole resistors, transistors and a ...

The station already has electricity and wall frames and now they’re waiting to install the HVAC system and plumbing. “Once we get all that done, we’ll be moving pretty good,” said Houston.