# Need Help regarding the decade counter

#### Green

Mar 25, 2023
5
I'm new to this forum, sorry my english is not so good, just use a translator, and my knowledge about circuits and electronics is very low,
Here I want to ask for help from fellow forumers

For example clock input from ic555 t-on 30% and t-off 70%. see the example in the picture

If using ic4017 decade counter and activate 3 outputs, ouput from ic4017 such as A1, A2, A3

What is the easiest way to get outputs like B1, B2, B3, which only follows the T-on clock input

Hope fellow forumers can help me

#### crutschow

May 7, 2021
857
What is the easiest way to get outputs like B1, B2, B3, which only follows the T-on clock input
You could use an AND gate connected to the clock and each of the FF outputs.

#### Green

Mar 25, 2023
5
You could use an AND gate connected to the clock and each of the FF outputs.
Thanks crutschow, my knowledge about circuits and electronics is very low,

can you give a sample or diagram of how the AND gate is connected to the clock and each of the FF outputs.

#### crutschow

May 7, 2021
857
Thanks crutschow, my knowledge about circuits and electronics is very low,

can you give a sample or diagram of how the AND gate is connected to the clock and each of the FF outputs.
You just need one two-input AND for each FF with one of each of the inputs connected to each FF output.
The other inputs of all the AND gates are all connected to the clock signal.

#### Green

Mar 25, 2023
5
You just need one two-input AND for each FF with one of each of the inputs connected to each FF output.
The other inputs of all the AND gates are all connected to the clock signal.
Sorry if i make mistake, like this picture,

I think not work

#### Green

Mar 25, 2023
5
You just need one two-input AND for each FF with one of each of the inputs connected to each FF output.
The other inputs of all the AND gates are all connected to the clock signal.
Maybe I misunderstood the info you gave, especially the abbreviation "FF" output, I got more guidance from another forum, you mean like the diagram below

I think it would work well.

Thanks crutschow for the feedback given

I think my problem is solved.

#### Green

Mar 25, 2023
5
I update for reference, After searching for AND gates using transistors,

By using an NPN transistor as an AND gate, the voltage and Ampere ouput B1, B2, B3 can be controlled higher and wider depending on the input value or Vcc

And if the output value from ic4017 is enough, we can use only 1 NPN transistor to get the output B1, B2, B3,

Feb 19, 2021
784
Some questions :

1) What is clock rate from the 555 timer ?
2) What accuracy do you want in your timing ?
3) What pulse width you want for Bn outputs ?

Regards, Dana.

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