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HEXINVERTER.NET presents vcNOIZ voltage controlled noise oscillator UNIVERSAL PCB Assembly Manual v1.0 This assembly manual applies ONLY to the UNIVERSAL through hole style of PCBs (NOT surface mount!)

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  • HEXINVERTER.NET

    presents

    vcNOIZvoltage controlled noise oscillator

    UNIVERSAL PCB Assembly Manual v1.0

    This assembly manual applies ONLYto the UNIVERSAL through hole

    style of PCBs (NOT surface mount!)

  • IntroductionThis manual exists to help guide the able-minded do-it-yourselfer on the journey of creating a vcNOIZ module from the PCBs offered at hexinverter.net

    This guide is only for the through hole “UNIVERSAL” PCB sets. While I show photos of the eurorack assembly process, the ideas can be applied to any format you so choose.

    If you are wondering what vcNOIZ is and what features it has, I suggest

    reading the User Manual over at the hexinverter.net project site

    (click), as these things are detailed in that manual.

    High quality panels are/will be available at Re:Synthesis (click) for this project.

    Technical NotesvcNOIZ consumes approximately +35/-30mA of current at 12V. vcNOIZ is un-tested at 15V but should work fine without any changes!

    vcNOIZ is based on the white noise generator from the Roland TR-909 drum synthesis circuitry. I recognised that it was a clocked noise generator and so immediately began to research methods for voltage controlling the clock and turning it into a noise VCO. A huge mention must go out to the great Thomas Henry (http://www.birthofasynth.com) -- it is the voltage controlled clock from his X-4046 VCO which I humbly learned from to create the heart of vcNOIZ. Thank you for all your excellent work, Thomas!

    Part SubstitutionsThe only slightly uncommon components used in this design are the two CD4006 integrated circuits. These were discontinued a number of years ago but can still be found in many shops around the world! Possible substitu-tions if you cannot find the CD4006 are:

    NTE4006 (available at Mouser Electronics. Part number: NTE4006)HEF4006 (can be found in surplus shops, eBay, etc.)

    http://hexinverter.net/public/vcNOIZ_USERMANUAL_v1.pdfhttp://www.resynthesis.co.ukhttp://www.birthofasynth.com

  • Control/Panel Descriptions

    Pitch Control -- This controls the base frequency of the noise VCO, just like any other VCO. Express yourself using this control while playing live for some awesome crunchy pitch sweeps! Turning the pitch all the way up will produce white noise at the AC NOISE output. Turning it all the way down will produce sub-audio clicks and pops which are suitable for use as random gates and to trigger events in your system.

    EXP CV Control -- This controls how much the signal present at the EXP CV input

    EXP CV input -- Input a control voltage to modulate the pitch of vcNOIZ exponentially (ie: musical response)

    LIN CV input -- Input a control voltage to modulate the pitch linearly. In this way, you can use linear FM with the oscillator for interesting ef-fects.

  • Clock input -- Input a positive logic clock anywhere around 3V in am-plitude, and get a random noise signal generated from your clock signal through vcNOIZ. This is a great way to get a random gate signal at the DC noise output of vcNOIZ. NOTE: this replaces vcNOIZ’s internal clock -- this means that vcNOIZ’s CV inputs and pitch control no longer affects the noise present at the vcNOIZ outputs.

    Clock output -- vcNOIZ’s internal voltage controlled clock is present at this output. NOTE: the clock is actually rather unstable so is great for complex, evolving patches. No temperature compensation was used in the circuit, as I feel that the instability adds an element of randomness to the otherwise pseudo-random algorithm used in the module to create the noise.

    AC Noise output -- This is the main, highest frequency noise output on vcNOIZ. When the pitch control is all the way up, white noise will be present at this output.

    DC Noise output -- Running at the same frequency as the AC NOISE output, this DC-coupled noise output provides random gates and event triggers for use triggering events and driving clocks into other modules in your sys-tem. Try running this into a clock divider module and using the clock di-visions to trigger percussive elements for some cool rhythmic patterns!

    AC Noise /4 output -- This is a lower frequency (frequency / 4) ver-sion of the main AC NOISE output. This allows for simultaneous different

    frequencies of noise to be used and explored in your system at once. This output has a special disturbing sound character to it compared to the main AC NOISE output! This is a great output to use to generate different sounding percussive elements alongside the other outputs.

    AC Noise /8 output -- This is a lower frequency (frequency / 8) ver-sion of the main AC NOISE output. This allows for simultaneous different

    frequencies of noise to be used and explored in your system at once. This output has a special disturbing sound character to it compared to the main AC NOISE output! This is a great output to use to generate different sounding percussive elements alongside the other outputs.

  • Assembly You will need to find a way of mounting the PCB to the panel. Here are a couple of photos that illustrate the method I use:

    PCB Overlay


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