Metronome circuit diagrams

This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a... [more]

circuit from:http://www.extremecircuits.net/2010/01/one-second-audible-clock-circuit.html