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 Forum index » DIY Hardware and Software » The Repair Shop
Triggering a drum on two consecutive beats with 4017
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Meehah



Joined: Jan 04, 2019
Posts: 7
Location: Australia

PostPosted: Wed Jan 09, 2019 4:29 am    Post subject: Triggering a drum on two consecutive beats with 4017 Reply with quote  Mark this post and the followings unread

Hello.

I am quite new to electronics, particularly CMOS, so I apologise if I am not using the right terms.

I have completed an extremely primitive drum machine using a 4017 for sequencing that works well with one issue. Because the 4017's output pulses have no gaps between them, when I have two consecutive pulses going to the trigger input of one drum, it acts as if it is just one continuous pulse and so only plays on the first.

Is there any way to make these separate beats with a gap in between? Sorry if this doesn't make sense, I've included a drawing depicting what I mean. In the drawing, Currently is what I have now, Desired is what I'm looking to make.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Thank you very much.
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Wed Jan 09, 2019 8:34 am    Post subject: Reply with quote  Mark this post and the followings unread

You could try this, but probably have to tinker a bit with the values of the c's and R's


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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Wed Jan 09, 2019 8:35 am    Post subject: Reply with quote  Mark this post and the followings unread

The most common way to do this is to connect the output(s) of the 4017 and the CLK signal to an AND gate. I have noticed this can cause
some unwantend triggers so have a look at the "Little Gate" sequencer as I used some extra components to solve that problem.

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gabbagabi



Joined: Nov 29, 2008
Posts: 535
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PostPosted: Wed Jan 09, 2019 9:52 am    Post subject: Reply with quote  Mark this post and the followings unread

something from the simulator

the simulator needed R3 to work properly, dunno if it could be ommited in the real world, i would say it depends on the following stage

edit: Senhor Grumble, you are still using this falstadt thing! Very Happy


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Grumble



Joined: Nov 23, 2015
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PostPosted: Wed Jan 09, 2019 10:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Senhor Grumble, you are still using this falstadt thing! Very Happy


Embarassed sorry, was in a rush Cool

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Meehah



Joined: Jan 04, 2019
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Location: Australia

PostPosted: Wed Jan 09, 2019 6:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you everyone for your help. The Little Gate looks good but I will probably try some of the other designs as I only need it on one or two beats. I'll report back with my results.
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Meehah



Joined: Jan 04, 2019
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PostPosted: Mon Jan 21, 2019 3:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

In the end I just used an AND gate with clock into one input and the output into the other input as was suggested above by PHOBoS. It worked very well but maybe if I was using it more I'd build the Little Gate for the consistency.
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