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 Forum index » DIY Hardware and Software
[New Project] vcNOIZ -- a harsh voltage controlled noise gen
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HexInverter



Joined: Aug 21, 2010
Posts: 338
Location: Canada

PostPosted: Fri Sep 21, 2012 8:45 am    Post subject: [New Project] vcNOIZ -- a harsh voltage controlled noise gen
Subject description: a DIY gnarly noise generator
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Hey ladies and gents!

I've yet another module I am developing. It is a 1bit voltage controlled noise generator with sub-octave simultaneous outputs and voltage control of the pitch. It creates gnarly ass C64/chiptune sounding noise textures.

PCBs are for sale here!: http://www.hexinverter.net






Here is the feature-set:

Inputs:
- Expo. response CV input (-V to +V)
- Linear response CV input (-V to +V)
- Clock input (square wave, positive logic)

Controls:
- Pitch control (to tune base frequency, just like a VCO)

Outputs:
- Base frequency noise output (a little smoother sounding than the divisions) [audio coupled]
- Sub octave /4 output (gritty sounding) [audio coupled]
- Sub octave /8 output (gritty sounding) [audio coupled]
- Base frequency DC coupled gate output (for when wanting a random gate when using a slower clock/pitch rate)
- Internal clock output (there was an extra opamp, so I figured this could be useful)


Basic Audio Demo:

vcNOIZ -- a voltage controlled distortion module for analogue synthesis by hexinverter.net

vcNOIZ Voltage Controlled Noise Oscillator DEMO2 by hexinverter.net

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Panels will be available at Re:Synthesis:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Watch the video for more info Smile

I'll have a PCB available if folks are interested!


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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!

Last edited by HexInverter on Fri Jan 04, 2013 2:24 pm; edited 8 times in total
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diablojoy



Joined: Sep 07, 2008
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PostPosted: Sun Sep 23, 2012 12:10 am    Post subject: Reply with quote  Mark this post and the followings unread

sounds good Hex
as usual i think i will want one.
You might need to slow down some , my cave is filling up fast . There's now over 200 boards in my backlog Embarassed damn never enough time Rolling Eyes
Wish i could take a sabatical for a year or two and just build.
Oh well i always said this would last me till retirement to finish if i was lucky.

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JingleJoe



Joined: Nov 10, 2011
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PostPosted: Sun Sep 23, 2012 3:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Please Sir, may I have some circuit diagram?
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HexInverter



Joined: Aug 21, 2010
Posts: 338
Location: Canada

PostPosted: Sun Sep 23, 2012 6:56 am    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
Please Sir, may I have some circuit diagram?


No circuit diagram until it is done, sorry Smile There are some evil people out there that will snap this up and make it into a commercial module if they think it's worth it.

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!

Last edited by HexInverter on Sun Sep 23, 2012 6:57 am; edited 1 time in total
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HexInverter



Joined: Aug 21, 2010
Posts: 338
Location: Canada

PostPosted: Sun Sep 23, 2012 6:57 am    Post subject: Reply with quote  Mark this post and the followings unread

diablojoy wrote:
sounds good Hex
as usual i think i will want one.
You might need to slow down some , my cave is filling up fast . There's now over 200 boards in my backlog Embarassed damn never enough time Rolling Eyes
Wish i could take a sabatical for a year or two and just build.
Oh well i always said this would last me till retirement to finish if i was lucky.


200!? lol!!! That is a massive backlog xD

That would be a fun year or two!

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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HexInverter



Joined: Aug 21, 2010
Posts: 338
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PostPosted: Sun Sep 23, 2012 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Beta PCB layout complete Smile Dimensions are 60x93mm.

It might not be until next weekend that I can prototype it Sad Gotta go work on school stuff now...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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HexInverter



Joined: Aug 21, 2010
Posts: 338
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PostPosted: Sun Sep 23, 2012 11:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Audio demo is up Smile

vcNOIZ -- a voltage controlled distortion module for analogue synthesis by hexinverter.net

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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JingleJoe



Joined: Nov 10, 2011
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PostPosted: Sun Sep 23, 2012 11:40 am    Post subject: Reply with quote  Mark this post and the followings unread

I understand about the schematics, keep them secret, could you clarify one thing for me though: Is there a PIC or other programmable IC in it?
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HexInverter



Joined: Aug 21, 2010
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PostPosted: Sun Sep 23, 2012 1:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
I understand about the schematics, keep them secret, could you clarify one thing for me though: Is there a PIC or other programmable IC in it?


Nopers! It is all discrete logic chips (CMOS) and analogue opamps! Smile

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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JingleJoe



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PostPosted: Tue Sep 25, 2012 5:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh excellent Smile I like that, for reasons of longevity.
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HexInverter



Joined: Aug 21, 2010
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PostPosted: Tue Sep 25, 2012 5:32 am    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
Oh excellent Smile I like that, for reasons of longevity.


Indeed sir! There are other benefits too -- there is no aliasing on the CV input Smile When you sweep the CV input knob, or feed a CV signal in, it is actually changing the clock (and thus, the pitch) in real time, in increments of one clock cycle (not aliased like with a microcontroller!)

Also, I am quite certain a microcontroller has different rise/fall times that effect the sound of the noise. I was comparing a similar noise routine I wrote on PIC to this CMOS circuit and they don't sound the same!

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sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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JingleJoe



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PostPosted: Tue Sep 25, 2012 6:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Better sound; Jolly good but could you define aliasing? I may know it by another name ...
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HexInverter



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PostPosted: Tue Sep 25, 2012 6:50 am    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
Better sound; Jolly good but could you define aliasing? I may know it by another name ...


Aliasing is the "stepping" that occurs when reading (or generating) any analogue signal with a digital device (in this case, a microcontroller). Basically, the ADC (analogue -> digital converter) on a microcontroller is typically 1024 (10 bit) step resolution, so, as you turn the CV knob on a digital device, or input a control voltage, the device actually only has 1024 steps on the control.

This may sound like a lot, but it IS actually noticeable to the ear when you are talking about a VCO. You typically can hear faint stepping in the pitch coming out of digital VCOs that only use the built-in 10bit ADC. Of course, you can purchase and use a 12bit ADC to greatly increase the resolution you can read at, but, it's nowhere near as cheap. Already, you've probably surpassed the cost of the two (only) decently expensive parts on the non-microcontroller CMOS design...the two CD4006/NTE4006s Smile

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sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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JingleJoe



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PostPosted: Thu Sep 27, 2012 11:43 am    Post subject: Reply with quote  Mark this post and the followings unread

I see now Smile all of the science has been explained, thankyou. Your circuit is really quite good then if it is making digital noise without aliasing, carry on the good work old sport Wink
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HexInverter



Joined: Aug 21, 2010
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PostPosted: Thu Sep 27, 2012 11:44 am    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
I see now Smile all of the science has been explained, thankyou. Your circuit is really quite good then if it is making digital noise without aliasing, carry on the good work old sport Wink


Haha, thanks for your kind words. I am happy to explain anything as far as I am capable of Smile

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sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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HexInverter



Joined: Aug 21, 2010
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PostPosted: Thu Sep 27, 2012 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Euro panel rendering!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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HexInverter



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PostPosted: Thu Sep 27, 2012 1:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

MU Panel Rendering:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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HexInverter



Joined: Aug 21, 2010
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PostPosted: Thu Oct 18, 2012 6:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Well, beta PCBs for vcNOIZ shall be ordered very soon, alongside the NeinOhNein Rimshot!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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HexInverter



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PostPosted: Fri Nov 23, 2012 5:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

vcNOIZ is now in preorder phase to help fund a production run!

The module is prototyped and is good to go! Woot!

You can preorder here: http://igg.me/p/282076?a=227451

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sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
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HexInverter



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PostPosted: Sat Nov 24, 2012 12:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

NOTE: The Bill of Materials and Mouser Cart has changed! I had to make some corrections to the BoM.

You will need to add another 100k resistor. The new BoM and Mouser Cart reflect this change.

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HexInverter



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PostPosted: Sun Nov 25, 2012 6:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here's the SMT circuit board rendering. Should be ready for the fab house now!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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SPIKE the Percussionist



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PostPosted: Sun Nov 25, 2012 6:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

sounds NEAT!!!

more like the noiz of a 2600 than a C64 to me though!

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HexInverter



Joined: Aug 21, 2010
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PostPosted: Sun Nov 25, 2012 6:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

SPIKE the Percussionist wrote:
sounds NEAT!!!

more like the noiz of a 2600 than a C64 to me though!


Haha! Well, whatever works for ya Very Happy

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seqSQUARED -- the Analogue Pattern Generator
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HexInverter



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PostPosted: Tue Dec 04, 2012 2:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

New audio demos as well as beta module photos!!!

vcNOIZ Voltage Controlled Noise Oscillator DEMO2 by hexinverter.net

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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hexinverter.net -- Shop DIY projects and modules for modular synthesis

sympleSEQ -- the simple to build analog step-sequencer

seqSQUARED -- the Analogue Pattern Generator
--> Put yourself on the hexinverter.net mailing list to be notified when in stock!
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Taylor



Joined: Jul 13, 2006
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PostPosted: Wed Dec 05, 2012 8:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Very cool sounds and lovely PCB design. Very Happy Wish I could afford the Eurorack boards as it looks like fun. Any chance you'd offer the PCBs without the SMT already mounted, for those of us comfortable with SMT soldering?
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