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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
digital noise clock troubleshoot
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Luka



Joined: Jun 29, 2007
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PostPosted: Sat Nov 15, 2008 6:02 pm    Post subject: digital noise clock troubleshoot
Subject description: 2nd of 3 cgs modules with build error
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got another issue, wondering if someone can give me help

my digital noise vco is not sweeping the full range i cannot get it to clock down to individual pulses, just a steady wash of pulses.
i can clock the unit with my cgs vco running as an external clock source and i have a full range and it sounds exactly how it should so i have a problem in my 4046 or somewhere before this.

This is a clean build, no scrappy solder joints and ive checked the component values around the 4046 vco section.
i have also increased the range of the speed pot to 50k and im still hitting the same lower barrier and not able to drive the clock down far enough

can i increase the range of the 4046 simply by increasing/decreasing one of the resistors/caps?

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problemchild
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neandrewthal



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PostPosted: Sat Nov 15, 2008 10:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

I don't think it is supposed to go real slow as is. Mine didn't go below the audio range either, so I added a 47n in parallel with the 10n via a switch. It's still not slow enough, so I think I'll try 330n next.
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Luka



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PostPosted: Sat Nov 15, 2008 10:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

ken just suggested increasing the cap
i was just wondering as the metalbox samples sound like it clocks right down low and i doubt they would be modding it much. good to know yours is doing this too andrew. ill give a 100n a go

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Luka



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PostPosted: Sat Nov 15, 2008 11:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

well with 100n i get lower pulses but i loose the real top end noise sounds :/
I will try a few other values, see what if i can pin down a nice balance

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neandrewthal



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PostPosted: Sun Nov 16, 2008 12:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, that`s why I used a switch. One setting for audio and one for random gates.
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Luka



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PostPosted: Sun Nov 16, 2008 12:55 am    Post subject: Reply with quote  Mark this post and the followings unread

im going to do some investigation on how to max out the range on this thing, i really want to do nice sweeps without using an exteral vco and lfo. it almost might give me some insight into making extending the range on the wogglebug vcos
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Luka



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PostPosted: Mon Nov 17, 2008 4:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

fixed!
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problemchild
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neandrewthal



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PostPosted: Mon Nov 17, 2008 6:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

What do you mean "fixed"? How? Don't be a tease Wink
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Luka



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PostPosted: Mon Nov 17, 2008 8:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

haha

well first it isnt a bug, ken just set the range of the 4064 to be in the audio range so this is more of a mod. Mike from metalbox led me to this answer so big thanks to him.

all you do is up the resistance on the offset resistors coming from the 4064. It makes complete sense too as this is the connection on the wogglebug 4064 that has a 1M range pot.

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neandrewthal



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PostPosted: Mon Nov 17, 2008 9:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, neat. Yeah, mike rocks. He helped me when I copied the metalbox layouts for a couple modules then found I had holes on my panels that aren't in the schematic. Embarassed
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whomper



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PostPosted: Sun Jan 25, 2009 4:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Luka wrote:

all you do is up the resistance on the offset resistors coming from the 4064. It makes complete sense too as this is the connection on the wogglebug 4064 that has a 1M range pot.


I too would like to make that mode, but I am not sure which resistors should I change and to what value.
Should I change to 1M pot as well?

Could you be more specific?

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Luka



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PostPosted: Mon Jan 26, 2009 1:58 am    Post subject: Reply with quote  Mark this post and the followings unread

the wogglebug has a range knob, so if you want a range control on the digial noise you could add a pot, otherwise use a fixed resistor to dictate the range. i was suggested to use a large resistor value 10m or more.

if you look on the 4046 datasheet it tells you which is the range offset (pin 12)

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The Bad Producer



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PostPosted: Wed Apr 17, 2013 11:09 am    Post subject: Reply with quote  Mark this post and the followings unread

I've found the best results for the VCO range are without that resistor at all (the 4M7 attached to pin 12)

Does this really need the range offset? I don't think so, without the resistor I get from super slow to super high (white noise sounds like white noise) on the digital outputs...

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widdly



Joined: Jun 25, 2007
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PostPosted: Sun Apr 21, 2013 9:58 pm    Post subject:   Reply with quote  Mark this post and the followings unread

Nice one! I think you are right. After reading the datasheet, it looks like removing the 4M7 would lower the minimum frequency without increasing the maximum frequency.

I'm going to try it on my digital noise tonight.
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The Bad Producer



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PostPosted: Mon Apr 22, 2013 3:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, it is good! I did a couple of demos here (at the top of the page)

https://soundcloud.com/sillon27

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