A great example is this simple wireless AC current detector from [NEW PEW]. The circuit is a simple one, and a classic. The spring from a ballpoint pen is soldered to the base of a BC547 ...

During normal operation, the light source does not point at the ... Installing battery-powered, WiFi connected smoke detectors is pretty simple. All you need is a ladder and a Phillips screwdriver.

The DAWN ® multi-angle light scattering (MALS) detector connects to most HPLC, GPC, FPLC or FFF separation systems to determine absolute molecular weight, size, and conformation of peptides ...