AC mains operated single LED flasher circuit, built using the popular CMOS timer chip TLC555 is shown below. The whole circuit is powered directly by the grid supply of 230VAC through a capacitive potential divider and associated components. This minuscule Power LED Flashing circuit can be easily fit inside a very small plastic enclosure.
The 220V flashing led circuit can be incorporated into a roadside/parking ground lane marker bollard, or used as a warning for other obstacles such as fences, scaffolding tubes, etc. It can also be suspended from light/fan switch pull-cords to make them easy to find in the dark.
IC1 is here wired as a low frequency free-running oscillator, whose frequency is determined by the values of timing components R2, R3 and C3. With the values and configuration shown, IC1 works like a narrow pulse width square wave oscillator source,giving very short positive pulses at its output pin3. Note that, IC1 is used to drive a 10mm red LED (D5) in reverse (ie sinking) mode. Resistor R4 limits the current flow through D5 and hence, through IC1.