Motorcycle travel speed and flexibility, it simply turn signal when turning the flash to alert pedestrians and vehicles around, and sometimes seem not enough, if the information in the flash of the ring and increase prompts the better. National Semiconductor LM3909 chip is produced single oscillator for 8-pin plastic small outline dual in-line IC, can drive the turn signal and speakers. The following circuit and other circuits with integrated high in comparison, less components, reliable, and the advantages of using a long time.