Is the switch spst and push button important in this circuit? I do this project without putting them in the circuit but it's not working.

 

When open the toggle switch only removes power from the 555 circuit.

The reset button will cause +9v to appear on Q6 output when closed.

What part of the circuit isn't functioning correctly ?

Is the 555 generating a output is disconnected from the 4017 input ?

All the led does not lights up.

 

When open the toggle switch only removes power from the 555 circuit.

The reset button will cause +9v to appear on Q6 output when closed.

What part of the circuit isn't functioning correctly ?
Is the 555 generating a output is disconnected from the 4017 input ?

I draw the circuit using livewire and then i convert it to PCB. So this is the picture. Maybe it will help.
realworldartwork

 

The 4017BP is configured as a Count To N and Recycle and in this case N is the Q6 output so when Q6 sequentially goes High it applies a Logic High to Pin 15 Reset and the count repeats again. The Reset Push Button allows for a manual reset at any time in the cycle. The SPST toggle switch powers the 555 clock pulse generator, it could be replaced with a straight wire bypassing it, If you have a scope you need to look at the output of the 555 chip. Pin 3 should be a pulse string out to the 4017 Clock Input. Check your pins and wiring as it should work.Pin 13 of the 4017 is a clock enable pin and should be held low to enable the clock i signal.

Ron

 

Is the 555 generating an output ?
Output voltage at 555 only 1.4v

Is the reset pin being held low ?


Is pin 13, the clock inhibit pin (not clock 2 as shown) being held low ?

Are the LEDs the correct way round ?
All LEDs are connected correctly

Is the 4017 showing any signs of overheating ?
Yes

You said you omitted the two switches, what have you done in their place ?
I replace it with a straight wire bypassing it

 

I replace it with a straight wire bypassing it

You can't do that. You are holding the 4017 in a reset state. Bypassing the Reset which is a momentary push button switch with a straight wire will not work. For count to happen pin 15 Reset needs to be low. This is a CD4017 Data Sheet, you may want to read it and review it. Note on page 3-52 what is going on with the Reset pin.

Ron

 

If you have replaced the reset push button with a piece of 2 things are happening.

1: The 4017 is being held in a state of reset
2: Output Q6 is being connected directly to 9v

I suspect you may have damaged your 4017. Connecting the reset button and output Q6 both to the reset input is a design flaw.

A datasheet for the 4017 maybe of help.

I have cut off connection between pin15 & pin16, and solder a wire at pin16 as a reset button like in the pic. Is it okay?