LED strobe timer 555 scheme presented here LED strobe is easy to manufacture. Variable resistor R1 adjusts the desired frequency. Resistor R1 sets the duration of the flash. Resistance R2 sets the maximum rate possible, and resistor R3 limits the current through the LEDs , it is adjusted for your LEDs using Ohm`s law or this small program! Transistor can be any low-voltage MOSFET, for example IRFZ44, IRFZ42, IRFR024N, CEM9926, FDN5630, IRLL014N, 06N03LA, MTB1306, 2SK3296 or similar.