Help! 4017 decoder?

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circuitfish

New Member

• Mar 7, 2009

• #1

Hi Folks,

I'm building a modulo 10 (decade) counter and was wondering how I would link a 4017 chip to a seven segment display.

Thanks for your time and support,

Steve

 

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colin55

Well-Known Member

• Mar 7, 2009

• #2

Show me the circuit and what you want to do.

 

House0Fwax

Member

• Mar 7, 2009

• #3

circuitfish said:

how I would link a 4017 chip to a seven segment display.

Click to expand...

Have a look at this. ( click on dice with decoded display )
**broken link removed**

 

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circuitfish

New Member

• Mar 7, 2009

• #4

Thanks,

That helped quite a bit. I was just wondering, I'm using a 4017 chip as i can make it reset to zero after it reaches nine automatically so that it counts conitnously.

Is there a way to reset a 4029 to zero automatically? I know you can load zero and make a flying wire briefly high but obviously this means manually reseting.

 

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colin55

Well-Known Member

• Mar 7, 2009

• #5

What do you want to do?

 

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circuitfish

New Member

• Mar 7, 2009

• #6

Just to make a simple decade (modulo 10) counter that scrolls through 0 to 9 continuously.

 

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colin55

Well-Known Member

• Mar 7, 2009

• #7

And what sort of readout do you want?

 

blueroomelectronics

Well-Known Member

• Mar 7, 2009

• #8

Why not use a 7490 decade counter instead of a Johnson counter?

 

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circuitfish

New Member

• Mar 7, 2009

• #9

I'm afraid I only have johnson series and I'm not really sure what is meant by readout but I want it to be displayed on a 7 segment disply.

 

blueroomelectronics

Well-Known Member

• Mar 7, 2009

• #10

Next time you buy parts, pick up a decade counter.

 

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colin55

Well-Known Member

• Mar 7, 2009

• #11

What do you want to appear on the 7-segment display?


I realise you have absolutely no idea what you want, that's why you have to provide a lot more detail if you want assistance.

 

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circuitfish

New Member

• Mar 7, 2009

• #12

Sorry Colin,

I want the seven segment display to scroll through from 0 to nine continuously.
I do appreciate the help.

 

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colin55

Well-Known Member

• Mar 7, 2009

• #13

So, you want digits to appear on the 7-segment display and not just a single segment to illuminate - as would be the case if you connect a 4017 to the display.

So, you cannot use a 4017 without a lot of diode gating.

You need another chip.

You need a CD 4026. It actually has current limiting (some of the brands)and can be connected directly to a 7-segment display.

 

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circuitfish

New Member

• Mar 7, 2009

• #14

Thanks a lot colin. You're a hero! I was just wondering If you could use a 4029 chip in some way to do the same thing. I'm doing an electronics course over the internet and need to show an alternative way of creating a project.

Thanks for your superdooper help anyway,

Steve

 

HD ELEKTRONİK

Member

• Mar 7, 2009

• #15

circuitfish said:

Thanks a lot colin. You're a hero! I was just wondering If you could use a 4029 chip in some way to do the same thing. I'm doing an electronics course over the internet and need to show an alternative way of creating a project.

Thanks for your superdooper help anyway,

Steve

Click to expand...

Easy with the diode matrix circuit.

 

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colin55

Well-Known Member

• Mar 7, 2009

• #16

Give him the diode gating circuit for a 4017 to 7-segment display.

 

HD ELEKTRONİK

Member

• Mar 7, 2009

• #17

1n4148 .....

 

HD ELEKTRONİK

Member

• Mar 7, 2009

• #18

**broken link removed**

 

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colin55

Well-Known Member

• Mar 7, 2009

• #19

What about the diodes for 0, 1, 2, 3, 4,,5, 6, 7, 8, 9

See, it's a much bigger task than you thought.

 

HD ELEKTRONİK

Member

• Mar 7, 2009

• #20

**broken link removed**