LED Flasher

This LED flasher is based on 555 timer. One can use this flasher circuit either on bike/cycle or in police car!. The operating voltage of the circuit is 9v, but you can also use it at 6v. 

Two sets of six LEDs are used here, but you can extend it to 40 each set. Flash cycle is determine by the RC time constant. However by using the pot you can set the flash rate of your choice.

Transistor are used; to provide the additional current for leds and to switch the LEDs set at a time. Rest of the circuit is simple, no need to explain it; i guess. Now come to the circuit schematic.

Schematic:

LED Flasher

Components Required:

R1----------------------------4.7k ohm

R3, R4-----------------------220 ohm

R2 (VR1)---------------------150k or 220k pot

R5-R10-----------------------100 ohm

C1-----------------------------100nF Ceramic

C2-----------------------------1uF/25v Electrolyte

Q1-----------------------------BC547

Q2----------------------------BC557

D2-D7------------------------Blue LEDs

D8-D13-----------------------Red LEDs

U1------------------------------555 Timer