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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
Master Clock Divider
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PHOBoS



Joined: Jan 14, 2010
Posts: 1853
Location: Moon Base
Audio files: 361

PostPosted: Tue Sep 23, 2014 1:13 pm    Post subject: Master Clock Divider
Subject description: with stripboard layout
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A binary counter with inverted outputs which makes more sense when used for rhythms. And every division has an extra
'c' output which stays high for only 1 clock cycle, as long as the clock signal is high.

I first made a layout with all the chips in a row, but when I finished the design I realized that it was too big to fit
on a standard sized (100x160) stripboard since the strips are oriented in the other direction Rolling Eyes . So I designed a new one
which is a bit larger but it gave me some extra room to add transistor buffers for the CLK and Reset inputs.

I haven't build it yet and only tested 2 outputs, so I'll update when I know it's fully working.

this version isn't working correct, an updated version is posted a few posts down


Master Clock Divider.gif
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Master Clock Divider.gif



Master Clock Divider v1.0 - stripboard.gif
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Master Clock Divider v1.0 - stripboard.gif



_________________
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Last edited by PHOBoS on Sun Oct 12, 2014 5:43 am; edited 2 times in total
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Cynosure
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Joined: Dec 11, 2010
Posts: 709
Location: Toronto, Ontario - Canada
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PostPosted: Fri Sep 26, 2014 7:55 am    Post subject: Reply with quote  Mark this post and the followings unread

A very useful circuit. Thanks for sharing it Smile
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PHOBoS



Joined: Jan 14, 2010
Posts: 1853
Location: Moon Base
Audio files: 361

PostPosted: Sat Oct 11, 2014 4:54 am    Post subject: Reply with quote  Mark this post and the followings unread

I build it and when I powered it up there were 3 things wrong with it Rolling Eyes
- output 256c was the same as output 128c
- outputs 32,64,128,256 were out of sync with the other 4 outputs. (The divisions were correct but they started at the wrong time)
- It double triggered on the clock so the /2 output was in sync with the CLK and /4 was /2 and so on.

The first problem was fixed pretty fast and caused by a mistake I made on the stripboard design:
I put the 256c output on the wrong trace. Embarassed (should be the one next to it)

Second problem was also fixed pretty fast after taking a look at the datasheet were I found the following:
Quote:
The counter can be cascaded in the ripple mode by connecting Q4 to the enable input of the subsequent counter while the CLOCK input of the latter is held low.
What I had done was connect the CLOCK to Q4 and make the enable high. Luckely that was pretty easy to change on the stripboard.

Now for the third problem I have to do some more tests. Right now I have the CLK input of the CD4520 connected
to the output of U3d and that works great, but that shouldn't be necessary. I was actually having the
same problem with another divider circuit I breadboarded so I have to figure out how to fix that.


I also made two other small changes to the circuit;
a diode in series with the CLK input so I could connect something that has a negative output voltage.
a capacitor added to the reset input so that it only creates a short pulse. The reset button still works the same.

I will upload the updated versions once I have the double triggering problem figured out.

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http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards
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PHOBoS



Joined: Jan 14, 2010
Posts: 1853
Location: Moon Base
Audio files: 361

PostPosted: Sat Oct 11, 2014 6:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Changing R3 (the pullup resistor attached to the input of U2f) from 10K to 4.7K seems to make it work. Very Happy
So here's the updated schematic and stripboard layout.
(note that there is a cut under C7!)


this version wasn't working 100% correct either, so there is another updated version posted a few posts down


Master Clock Divider v2.0.gif
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Master Clock Divider schematic
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Master Clock Divider v2.0.gif



Master Clock Divider v2.0 - stripboard.gif
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Master Clock Divider stripboard
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Master Clock Divider v2.0 - stripboard.gif



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards

Last edited by PHOBoS on Sun Oct 12, 2014 5:45 am; edited 1 time in total
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PHOBoS



Joined: Jan 14, 2010
Posts: 1853
Location: Moon Base
Audio files: 361

PostPosted: Sat Oct 11, 2014 11:28 am    Post subject: Reply with quote  Mark this post and the followings unread

and here's what it looks like Cool

I turned 2 cheap plastic CD storage racks into modular synth racks by adding some wooden mounting rails to it.
Will take some photos once I added the power section.


Master Clock Divider - 01.jpg
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Master Clock Divider module
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Master Clock Divider - 02.jpg
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Master Clock Divider module
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Master Clock Divider - 02.jpg



_________________
"My perf, it's full of holes!"
http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards
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PHOBoS



Joined: Jan 14, 2010
Posts: 1853
Location: Moon Base
Audio files: 361

PostPosted: Sun Oct 12, 2014 5:40 am    Post subject: Reply with quote  Mark this post and the followings unread

hmm, so it seemed to work correct untill I started using it to control something else. No problem with the gate outputs
but apparently the c(locked) outputs send out a double pulse Confused . I fixed it (I think) by connecting the input of U4c (pin8) to
the output of U3d instead of U2f.

I just used some wire to connect the two points together (v2.1a) but I also made a stripboard design which uses jumpers (v2.1b).


Master Clock Divider v2.1 - schematic.gif
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Master Clock Divider v2.1a - stripboard.gif
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Master Clock Divider v2.1b - stripboard.gif
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_________________
"My perf, it's full of holes!"
http://phobos.000space.com/ http://www.acidtrash.com/ Stickney Synthyards
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