A problem with 4017 decade counter Answered
Hello. I've tried to build a very simple LED chaser (started out with only 3 LEDs) using 4017 IC, but I can't make it work properly. Instead of switching LEDs on and off one after another the circuit only turns on the LED tied to Q0 when clock signal is high. As soon as the clock signal goes low, the LED goes off, and the others sometimes flicker very dimly for a split second. Turning the clock signal back to high LED tied to Q0 is lit again. I believe everything is set up correctly: pin 16 is connected to +, 15 (the reset pin) to pin 7 (Q3), 14 to + through a 1k resistor and to - through a switch (thus manually generating clock signal), 13 and 8 are grounded, and pins 3, 2 and 4 (Q0, Q1 and Q2 respectively) are connected to LEDs. The components are placed on a breadboard. Have I connected something wrongly or could it be the chip malfunctioning? Thanks in advance.