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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Sat Oct 10, 2015 2:49 am Post subject:
noise oscillator Subject description: noise! |
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i've made a noise synth out of a cd4093 + cd4040
this is a picture of a dual version, fully expanded.
you can patch all the 4040 divisions together, to make sound + rythme variations.
all the info to build it (+eagle files) resides here:http://reverselandfill.org/workshops/cmos.html
it's my first pcb project
i've made some updates to the pcb recently, for cv control per OSC and better noise.
here is the schematic of this new version:
ps: the diodes at the cv mod part are zeners
sounds of the (old) dual version:
https://soundcloud.com/martijn-verhallen/fetid-noise-modular |
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synaesthesia
Joined: May 27, 2014 Posts: 291 Location: Germany
Audio files: 85
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Posted: Mon Oct 12, 2015 12:30 am Post subject:
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fetideye! What a wonderful noise
If I get the schematic right, JP1 is meant to patch some of the 4040 divisions together. I think it would be a good idea to have a resistor in series with each input so that you don't create any shorts between HIGH and LOW outputs of the 4040. |
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Tue Oct 13, 2015 4:51 am Post subject:
noise oscillator |
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hi synaesthesia
thanks!
by resistors in series, you mean that every input to jp1 :
----cable---resistor---jp1
while all jp1 pads are connected?
what value should i take? 1k? |
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synaesthesia
Joined: May 27, 2014 Posts: 291 Location: Germany
Audio files: 85
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marcelds
Joined: May 24, 2011 Posts: 19 Location: austria
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Posted: Thu Nov 26, 2015 10:37 am Post subject:
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hey, this is a little late I see, but i'm going to start building this - trying to make sure i fully understand the schematic first.
from the build guide, there are these mod suggestions:
Quote: | Connect all the division outputs to patchpoints on your panel (banana?)
Use the DIV shaper inputs as patchpoint inputs |
so JP1 is for the output stage, e.g. the divider outputs from the 4040 get patched up to there on the panel. each nand output on the 4093 gets its own output, as does the final output. where exactly are the DIV shaper inputs?
looks like a super interesting circuit. thanks a lot for sharing. |
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Thu Nov 26, 2015 11:22 am Post subject:
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the mod guide was intended for the older version.
the idea is that you patch the division outputs (2, 4, 8 , 16, 32 etc) onto the div1 / div2 and div3 inputs.
note: something has to be patched in div1 to hear sound
if you make the mega version, you make output points for all divisions and inputs (div1, 2 and 3 , and it is useful to make some multiples of these)
and here is an example for cv inputs (d1 = 9.2v zener, not super essential, but handy for 12v modular connections)
ps: i have some pcb's (and full kits) left, if you are interested |
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marcelds
Joined: May 24, 2011 Posts: 19 Location: austria
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Posted: Thu Nov 26, 2015 2:00 pm Post subject:
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aha, got it! thanks a ton for the explanation, and for the new schematic. i'll let you know how it sounds for me ; ) |
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fetideye
Joined: Jun 22, 2015 Posts: 27 Location: Netherlands
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Posted: Thu Nov 26, 2015 2:08 pm Post subject:
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ps: a good patch to start with is:
/16 - div1
/4 - div2
/2 - div3
then add bigger divisions for variations.
ps2:
the potmeters are left orientated. (noise against hate)
turn left for high frequencies / noise
turn right for bleeps
i made a mod with a multiturn potmeter on pot1. works good for channeling the sweet spots. |
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marcelds
Joined: May 24, 2011 Posts: 19 Location: austria
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Posted: Thu Nov 26, 2015 2:38 pm Post subject:
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hell yeah to left-oriented noise against hate |
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