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 ...

This, however, is not the case, as they need around 100 volts of AC current to allow them to light up. For a battery-powered solution, this means converting the battery’s DC power to AC.

On December 15, AC Milan celebrated their 125th anniversary before and during their home match against Genoa. Things, however, didn't quite go as planned and the side coached by Portuguese manager ...