This circuit uses three 555s in the monostable mode triggered by a 555 in the astable mode to produce three delayed pulses which appear to be randomly sequenced. The application I designed this circuit for was a delayed strobe sequence controller for faa night flying regulations compliance in my friends experimental aircraft. Buying one would've costed an arm and a leg, but this is really cheap to make and is easilly customizeable to suit needs. Comments welcome. -Jolly
