Im first student electrical engineering. I keep stuck that i cant get decade counter instead 10 i want to use second decade counter to make it count further to 20. I found one of image from ACC(this website) that might help, but im looking forward as wel for other suggestions incase this doesnt work.

 

hi OTC,
Welcome to AAC.
This is a clip from the 4017 datasheet, also showing counter expansion, works OK.

E

 

hi OTC,
Welcome to AAC.
This is a clip from the 4017 datasheet, also showing counter expansion, works OK.

E
View attachment 361089

Thank you i wil look in to that

 

Welcome to AAC!

Im first student electrical engineering. I keep stuck that i cant get decade counter instead 10 i want to use second decade counter to make it count further to 20.

Using 74HC132 would be a difficult way to implement a counter to 20. What are you intending to do with the counter outputs? CD4017 is a Johnson counter and only one output is HIGH at a time.

Post the complete text for the problem.

 

74HC132 is a quad 2-input NAND gates.
MC14017 is a Johnson decade counter.

It depends on the specific application.
Any BCD counter such as 74HC160 can be cascaded to give multiple digits, ---99 and more.

 

Welcome to AAC!
Using 74HC132 would be a difficult way to implement a counter to 20. What are you intending to do with the counter outputs? CD4017 is a Johnson counter and only one output is HIGH at a time.

Post the complete text for the problem.

I'm using diodes and different resistors between 10k - 30k ohm to make different amplitudes. That way each count has different volt level.

 

74HC132 is a quad 2-input NAND gates.
MC14017 is a Johnson decade counter.

It depends on the specific application.
Any BCD counter such as 74HC160 can be cascaded to give multiple digits, ---99 and more.

Sorry i mistyped it was a CD74HC4017 decade counter that i was using

 

Im first student electrical engineering. I keep stuck that i cant get decade counter instead 10 i want to use second decade counter to make it count further to 20. I found one of image from ACC(this website) that might help, but im looking forward as wel for other suggestions incase this doesnt work.View attachment 361085

Component is CD74HC4017 not a SN74HC132. Apologies for misstype

 

hi OTC,
Your Thread Title typo error corrected.
Mod

 

Im using diode en differentresistors inbetween 10k - 30k ohm. To make different amplitudes. That way each count has different volt level.

Schematics are typically better than words for conveying circuit intent.

Is this a school assignment? Or just something you want to do?

 

but I'm looking forward as well for other suggestions in case this doesn't work.

If you only need an output on count 20 the AND gate can be eliminated.

 

Schematics are typically better than words for conveying circuit intent.

Is this a school assignment? Or just something you want to do?

This is school project. Here is base of it in schematic. If you would like to see full schematic i can share that as wel

 

I see some of the resistors have the same value in the voltage divider circuit.

 

Im first student electrical engineering. I keep stuck that i cant get decade counter instead 10 i want to use second decade counter to make it count further to 20. I found one of image from ACC(this website) that might help, but im looking forward as wel for other suggestions incase this doesnt work.View attachment 361085

Hi,

Do you have a good reason why you want to use Johnson counters rather than standard BCD counters?

 

Hi,
Do you have a good reason why you want to use Johnson counters rather than standard BCD counters?

I think it has to do with this statement made back in post #6

"I'm using diodes and different resistors between 10k - 30k ohm to make different amplitudes. That way each count has different volt level"

 

@OutTheClouds : It is extremely unclear what you are attempting to accomplish. You take about wanting to count to 20, but then talk about wanting different amplitudes.

What, EXACTLY, are the goals of the project? Not how you are thinking of solving it, but what the actual project requirements are. We can't help guide you toward an acceptable solution unless we know what a solution has to entail in order to be acceptable.

 

I think it has to do with this statement made back in post #6

"I'm using diodes and different resistors between 10k - 30k ohm to make different amplitudes. That way each count has different volt level"

Hi,

That's interesting, but we don't need a Johnson counter to do that, unless there is some specific output voltage level goal.
For example, using regular counters with no decoding you can generate a staircase wave that goes up and down.
Maybe what we need is the spec on what these voltage levels have to be.