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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
4089 Rhythm Generator
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PHOBoS



Joined: Jan 14, 2010
Posts: 4998
Location: Moon Base
Audio files: 670

PostPosted: Sun Oct 19, 2014 4:02 am    Post subject: 4089 Rhythm Generator
Subject description: with reset/sync
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A rhythm generator using the CD4089, very similar to the one I used for the bandersnatch except this time I'm using the clear input as a reset.
For this to work the D input needs to be low when the Clear is made high. So I used an AND gate (made up of U2a + U2b) to
be able to make the D input low. Because this has to happen when the Clear input is high there is an extra inverter (U2c) on
the input of this AND gate. The reset signal is turned into a very narrow pulse and used as a sync input. The Clock needs to
be inverted (since the CD4089 triggers on a high to low transistion) so I used a transistor for that.
The 3 position (toggle) switches make it possible to select between a high, low, or external signal for the ABCD control inputs.


4089.gif
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CD4089 timing diagram
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4089.gif



4089 Rhythm Generator.gif
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4089 Rhythm Generator schematic
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4089 Rhythm Generator - 01.jpg
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4089 Rhythm Generator
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4089 Rhythm Generator
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4089 Rhythm Generator
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dave the butcher



Joined: Jan 21, 2014
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PostPosted: Sun Oct 19, 2014 2:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow, looks interesting!!!
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gasboss775



Joined: Jan 02, 2016
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PostPosted: Thu Mar 09, 2017 5:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS have you tried running an audio rate clock through this. The 4089 makes a good melody generator if you sequence the ABCD inputs with a pattern generator.
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PHOBoS



Joined: Jan 14, 2010
Posts: 4998
Location: Moon Base
Audio files: 670

PostPosted: Fri Mar 10, 2017 1:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

I probably tried it but I am not entirely sure, so I guess I have to give it (another) go. It should indeed work very nicely.
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mike page



Joined: Sep 26, 2016
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PostPosted: Wed Jan 17, 2018 1:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

Excellent! I was just thinking of building pretty much exactly this. I dont have to do the breadboarding now! THANKSSSSS!
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PHOBoS



Joined: Jan 14, 2010
Posts: 4998
Location: Moon Base
Audio files: 670

PostPosted: Thu Jan 18, 2018 5:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

good to hear it's useful Very Happy

You can get some longer sequences out of it by connecting the control inputs to a counter like a 4040. Even more fun if
you use an output of the 4089 to clock that. Of course you could use any digital signals and I often use a LFSR to have
some (semi-)random variations when I use it for drums.

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mike page



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PostPosted: Sun Jan 21, 2018 6:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I turned it into a PCB Smile

Im developing a surface mount lunetta modular format where the modules are horizontal as that seems to suit my designs best. They will latch straight onto power rails, maybe with magnets. Here we are looking at the back of a panel.
bolts and switches go through the larger pads. It should be very flat, I might build it into the shell of an old macbook Smile

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

At the larger blue 'O' a pin on the 4089 needs to be bodged to ground.
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