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Decade Counter

Elk

May 11, 2017
3
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May 11, 2017
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Hye everyone!
I was just exploring how a decade counter works.
Here is this simple circuit where I am giving the signal using a switch, and am using 6 LEDs. The reset has been connected to output 6 so that after the sixth LED, the counter re-initializes.
However, this circuit which looks alright to me, isn't even working.

I have already rewired the circuit twice, checked the connections, but nothing seems to work.

This is the link to the circuit picture:
https://drive.google.com/open?id=0B0X-NIVr5TsRenJPZ1BmaW9GSjQ

Sorry for the amateurish wiring! I have started electronics only recently.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
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25,505
Do you have a circuit diagram?

Presumably that's a 4017?

What is your power supply and which of the wires are positive and negative?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
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Do any LEDs light?

A problem that you will have is that a single press of the button may cause the counter to count anything from a few to dozens of pulses as keybounce from the button causes lots of transitions. Also, you need to pull the input to a definite voltage level via a resistor rather than leaving it float when the button is not pressed. The same is true of other inputs (of course, assuming you've got a CMOS 4017 chip.)
 

Elk

May 11, 2017
3
Joined
May 11, 2017
Messages
3
Do any LEDs light?

A problem that you will have is that a single press of the button may cause the counter to count anything from a few to dozens of pulses as keybounce from the button causes lots of transitions. Also, you need to pull the input to a definite voltage level via a resistor rather than leaving it float when the button is not pressed. The same is true of other inputs (of course, assuming you've got a CMOS 4017 chip.)

None of the LEDs light up. Gonna try your suggestion though. Thanks!
 

Audioguru

Sep 24, 2016
3,640
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Sep 24, 2016
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3,640
The circuit is too simple.
1) Pin 14 is floating but it MUST have a resistor to GND.
2) When power is applied, the counter can begin at any count. Maybe it begins at count 7, 8, 9 or 10 then your button will seem like it does nothing. Add a "power-up reset" circuit with a capacitor and resistor.
3) I agree that the button contacts will bounce many times when you push it and the counter will count all the bounces. Add a "debounce" circuit.
 
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