that first it will light up one by one all LEDs connected to the first output of the all 4017 ICs which are "Q0" then it will light up all LEDs one by one connected with the second output of the all 4017 IC which is Q1 and so on.
The circuit is using 50 LED but you can increase the number of LEDs to 60, 70, 80, 90 or 100 by simply adding a 4017 IC for each ten LEDs, and connect an output of the IC2 to its pin14. For example if you want 60 LED chaser then simply add one more 4017 decade counter IC with same connections and disconnect the pin1 of the IC2 from IC2 pin15 and connect the IC2 pin1 with the new added 4017 pin14. After that connect pin5 of the IC2 to IC2 pin15.
You can also decrease the number of LEDs to 40, 30 or 20 by simply removing each 4017 IC and connecting its output to pin 15 of the IC2. For example if you want 40 LED chaser then simply remove the IC7 and connect the pin10 of the IC2 to pin15 of the IC2 and remove the connection of pin1. The circuit can also be used for other purposes like 50 to 100 separate pusle generator etc. The operating voltage of the circuit is 5V to 12V DC.
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If you are looking for an easy circuit of a 50 to 100 LED chaser or sequencer then this project will work well for you. The circuit is easy to build and understand, it is using six 4017 decade counter ICs and one 555 timer IC. This circuit will light up 50 LED one by one or in sequence. The sequence will work like
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