Progressive or Thrash? How Metal Detectors Discriminate

Metal detecting is a fun pastime, even when all you can find is a little bit of peace and a whole lot of pop tabs. [Huygens Optics] has a VLF-based metal detector that offers much more feedback than just a beep or no beep. This thing is fancy enough to …read more

Continue reading Progressive or Thrash? How Metal Detectors Discriminate

Phase Shift Pump Control? There’s an App for That.

The sort of pumps used in the filtration systems of fountains and swimming pools don’t take kindly to running dry. So putting such a pump on a simple timer to run while you’re away comes with a certain level of risk: if the pump runs out of water while you’re …read more

Continue reading Phase Shift Pump Control? There’s an App for That.