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OPERATION : This circuit flashes 2 groups of super bright LEDs (red & blue) continuously at an adjustable rate
The timer IC (IC1:NE555) is
configured as an astable multivibrator which generate a continues square wave
(frequency adjustable via PR1). This square wave is used to clock the decade
counter IC2 (CD4017) with outputs (Q0,Q1,..,Q9). The outputs goes high
sequentially from Q0 -> Q9 ( continuously).
The outputs are divided into 2 groups ; one group driving the RED LEDs while the other the BLUE LEDs. The forward voltage of Red LEDs is around 1.5~1.8V each whereas blue one is around 3V. For this reason, the red LEDs are connected 4 pcs in series (total 7.2V) and the blue LEDs 3 pcs in series (total 9V). R3 & R2 are current limiting resistors for red LEDs and blue LEDs respectively.