Calculate the frequency and/or duty cycle of an astable 555 timer.

Black smoke will indicate no decision, but white will confirm a new pope has been elected. Catholics traditionally gather in St Peter's Square to watch for the smoke above the chapel. Image ...

PC hardware is nice, but it’s not much use without innovative software. I’ve been reviewing software for PCMag since 2008, and I still get a kick out of seeing what's new in video and photo ...