Chasers light up to 65 leds (0 to 64)


The symbols for the LEDs simply indicate the connection direction, the flat side for the cathode.

U1,2,4,5,6,7,8 and 9 are 4017 (decimal counter)

U3 and U10 are 7408 (quad 2-input AND gate)

R1,2,3,4,5,6,7,8 resistances whose value depends on the LEDs used

P1 is used to supply 5 volts (the square VCC for the positive)

P2 is the Q9 output of the last 4017 it must be connected to P8 (RESET)

P7 receives the clock signal (CLK), this signal is generated not another circuit (not on this PCB).


You can limit the number of LEDs in the cycle, just connect the anode connection of the LED following the last LED lit with P8 (RESET).

Example: to light the LEDs L0 to L59 sequentially, then start the cycle again, connect the connection for the anode (rounded side of the symbol) from L60 to P8.

If you use all the same leds you can connect all the cathodes together and use only one R1 resistor

I use 3 of them to create a clock (see video)

Sep 03,2018
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