DIY CMOS frequency divider

funkyfarm · Posted: Sun Jun 24, 2007 12:32 am Post subject: DIY CMOS frequency divider

hi,

Does anyone have a DIY CMOS frequency divider schematic ?

something smaller than CGS Sub harmonic...
4013 based ?

Is this really use in a full-vco modular setup ?

There's here a short example :
http://www.cluboftheknobs.com/videos/C_915.mpg

http://www.blacet.com/FDmanualBasic.pdf

yusynth · Joined: Nov 24, 2005 Posts: 1314 Location: France

Scott Bernardi :
http://home.comcast.net/~sbernardi/elec/og2/og3_sine_suboctave.html

sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

i think this was released into the public domain, but if it wasn't then i'll take down this link (john has released a few schematics before on the SDIY list):

http://www.freeinfosociety.com/electronics/schemview.php?id=112

it's a simpler version of the one he sells. consult the faceplate to see what does what.

iorobyy · Joined: Sep 26, 2005 Posts: 65 Location: Italy

Maybe the simplest solution is to use a 4024 in a configuration like so (or similar)
http://www.milton.arachsys.com/nj71/img/Jen/SX1000/sch/osc_subosc.gif

but look! only square octave divided outputs Rolling Eyes

...maybe you need a wshaper

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

Hi:
In the last part of the EFM Mad Mouse Synth manual (Mods section), there
is a simple sub octave generator taked from the SH-101. Is based on a 4013.
I'm planning to build 2 to add to my Sound Lab Mini-Synth.
Here is a link to the pdf:
http://www.synthdiy.com/show/getfile.asp?get=171

funkyfarm · Posted: Thu Mar 06, 2008 11:31 am Post subject:

Sub OSC is really usefull on a (signle-vco) SH-101 ! really

But who has a 4013 audio divider in his setup and won't be able to sell it ?

RF · Posted: Thu Mar 06, 2008 2:58 pm Post subject:

This one works pretty well - I've got it in my setup.
Very useful to me.

<EDIT> also - you might look at the Ken Stone pulse divider. If you put audio into it it does in fact offer you divide by 1,2,3,4,5,6,7 and 8 - all available simultaneously. I use it as a suboscilator as often as I do a clock/pulse divider. And, you can get some unusual beats out of it if you use it for percusion type sounds.</EDIT>

bruce

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fonik · Posted: Fri Mar 07, 2008 1:02 am Post subject:

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

funkyfarm · Posted: Mon Mar 17, 2008 2:23 am Post subject:

Well, so 4013, 4024, 4040 and all CMOS 4xxx-based clock divider do some good subharmo generator.

Sonically, these are not pure, "precise" oscillator waveforms...
Good for basslines, "à la SH-101" !

I have 4024-based trigger dividers :
http://www.analog-synth.de/synths/mod2/trigdiv/trigdiv.htm

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isak · Posted: Thu Mar 08, 2012 12:22 am Post subject:

LektroiD · Posted: Thu Mar 08, 2012 4:32 am Post subject:

This looks like a damned useful module. I'm really surprised nobody's done a batch of PCBs for something like this.

isak · Posted: Thu Mar 08, 2012 6:15 am Post subject:

Hi
I did a stripboard layout, it's only my second layout ever Smile

I know it's ugly but I don't care Wink

I want to use it with the x0xb0x VCO I hope it will work good.
See if I have any mistakes please.

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Cheers guys.

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

I never finished my SoundLab Mini-Synth, I get derailed building modules for my modular. I have to build some sub-octave generators for my modular too, but I always start building something else...

isak · Posted: Thu Mar 08, 2012 8:14 am Post subject:

Thank you for your reply.

I didn't liked the sound of the sound lab so much so I sold it, but it's a fun project for advanced starters Smile

Can you Please go over my layout to see if I made a mistake ?

Cheers,
Isak E.

Sebo · Joined: Apr 27, 2007 Posts: 564 Location: Argentina

Pin 3 of the 4013 should be connected to the collector of the transistor, not to +12V.

isak · Posted: Thu Mar 08, 2012 8:45 am Post subject:

Thank you.

I've updated the layout above, so if you guys want to try it out and give the results here that would be great.

cheers,
Isak E.

cyclic · Joined: Mar 15, 2015 Posts: 95 Location: hobart

Necro post!

So i've just built one of these combined into a single module with 1/3 of the Yusynth 4017 divider and a 4069 clock generator which is normalled to either or both dividers. So the one module gives me a clock output and divisions of 1,2,3,4,5,6,7,8,16,32,64,128.
I accidentally drilled an extra hole in the panel, so I also made a NOT gate for both sub-modules, because, well, I had to do something with that hole and the other half of the CD4069..

ANYWAY: I would recommend to anyone who build EITHER of the circuits here to add a protection diode from gnd to the input transistor base as Yusynth does in his 4017 divider. This way you can feed it a bipolar signal from anything without worrying about frying the input buffer transistor.

It triggers happily from square, triangle, sine, ramp etc, but obviously theres a teeny tiny bit of a delay with non-square LFO inputs before the signal gets high enough to trigger.

Zac Belver · Joined: Sep 20, 2018 Posts: 1 Location: Brazil

Necro post! [2]

Today I've finished this one that I've started after reading this topic and other ones on the same subject. I've tested with 9V and 12V and it was ok.
The pulse switches idea came from the SH101 sub oscillator.
I didn't care not having a -2 oct square wav option.

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