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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
noise cornucopia random gates
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johnnymad



Joined: Apr 28, 2008
Posts: 40
Location: Gonzales, Louisiana

PostPosted: Wed Jul 16, 2008 11:28 am    Post subject: noise cornucopia random gates Reply with quote  Mark this post and the followings unread

i read all the other threads where people were having issues with the random gates on the noise cornucopia. i finished building my yesterday. at first no gates were being produced. i changed transistors and fixed the problem...i think. the led blinks and it produces gates, but it doesn't really go that fast. it's not slow either, it just doesn't speed up until the led is constantly on. is this normal, or should i try another transistor??
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Etaoin



Joined: Jun 30, 2005
Posts: 760
Location: Utrecht, NL

PostPosted: Wed Jul 16, 2008 12:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

After trying several transistors I ended up changing R8, as Ray suggests in his notes, to get it to output within the +/-5V range.
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johnnymad



Joined: Apr 28, 2008
Posts: 40
Location: Gonzales, Louisiana

PostPosted: Wed Jul 16, 2008 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Etaoin wrote:
After trying several transistors I ended up changing R8, as Ray suggests in his notes, to get it to output within the +/-5V range.


thanks. so gain is the problem? what did you change R8 to to make the gates faster?
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fluxmonkey



Joined: Jun 24, 2005
Posts: 695
Location: cleve

PostPosted: Wed Jul 16, 2008 3:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

which pin on the 4024 divider chip did you choose? pin 12 is the divide-by-2 output, which should provide the greatest number of triggers. i put a rotary seletor switch so i could change divisions on the fly.

bbob

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johnnymad



Joined: Apr 28, 2008
Posts: 40
Location: Gonzales, Louisiana

PostPosted: Wed Jul 16, 2008 3:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

i think i used pin 5, as ray did. it's too late to add a rotary to my panel, but i'll clip the jumper and try pin 12.
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fluxmonkey



Joined: Jun 24, 2005
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PostPosted: Wed Jul 16, 2008 6:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

yeah, so that should help (x16, in theory)...

pin 12: divide-by-2
pin 11: divide-by-4
pin 9: divide-by-8
pin 6: divide-by-16
pin 5: divide-by-32
pin 4: divide-by-64
pin 3: divide-by-128

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johnnymad



Joined: Apr 28, 2008
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Location: Gonzales, Louisiana

PostPosted: Wed Jul 16, 2008 8:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

i really wish i had room for a rotary. that's a really cool idea. maybe i can squeeze one in or at least add a spdt or so i can use more than one output. Wink
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Captain Biscuits



Joined: Jun 11, 2010
Posts: 112
Location: Northampton, UK

PostPosted: Tue Sep 21, 2010 10:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh I do love this forum.

Finished my Cornucopia last night and it seemed fine except for the random gates.

Quick search and problem solved. R8 needed to be nearer to 100K than 270K.

I did use a spare 12 way switch to try all the randomness options too and it seems a crime not to find space for it on the panel as it's all wired up and working so I have one more knob to twiddle.

Many thanks to all the posters, questioners and modulators who've provided such a useful searchable resource to solve all my problems late at night when a stubborn module is stopping me from sleeping.

Cheers

Ian
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diablojoy



Joined: Sep 07, 2008
Posts: 790
Location: melbourne australia
Audio files: 11

PostPosted: Tue Sep 21, 2010 5:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

snap Laughing same deal. I just finished a dual module and that is such a good idea now i will have to find some panel space for 2 rotary switches it seems.
100k for R8 will have to try that also to see if it improves the pulse as i'am having trouble with some modules not seeing them. thanks
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sonicwarrior



Joined: Dec 22, 2005
Posts: 223
Location: Cologne, Germany

PostPosted: Mon Jun 18, 2012 2:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

fluxmonkey wrote:

pin 12: divide-by-2
pin 11: divide-by-4
pin 9: divide-by-8
pin 6: divide-by-16
pin 5: divide-by-32
pin 4: divide-by-64
pin 3: divide-by-128


Thanks for this listing. I have a Bridechamber front panel which uses a two way switch instead of a rotary to provide a fast and slow setting. If I install an on-on-on switch instead of an on-on I could have 3 positions.
Any suggestions which 3 of the 7 possible positions are the most useful aka most used?
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sonicwarrior



Joined: Dec 22, 2005
Posts: 223
Location: Cologne, Germany

PostPosted: Thu Jun 21, 2012 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Used the /2 (fast), /16 (center) and /128 (slow) positions now.
I don't think a full rotary switch is needed as the frequency ranges by the frequency knob overlab with these settings already. So I would suggest to save the front panel space and use an on-on-on switch with these positions instead.
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