VCO tuning

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This topic contains 2 replies, has 2 voices, and was last updated by  mr.bijou 1 year ago.

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  • #1584

    mr.bijou
    Participant

    Hello there,

    I am having problems tuning the ns-1. Using the tune knob and a tuner I can easily set the initial note, usually a C3. The problems start when playing. As I go further away on the keyboard the tune goes down slightly on every note. On C4 I have lost 15 cents, so it’s quite noticeable.

    Have anyone noticed the same? Any hints?

    Thanks!

    #1604

    Davide Mancini
    Keymaster

    Hi Mr Bijou!
    We calibrate the nanosynths one by one to track at least 4 octaves so it could have happened that during the packaging the V/oct trimmer was touched and got out of scale… The tuning is pretty simple once you take off the metal bottom case…
    I don’t have an NS1 with me at the moment to take a pic but let me try to define a procedure:
    -before doing anything discharge yourself (touch any metal appliance surface or heating pipes or the external of your washing machine :).
    -take off the four plastic rivets and detach the board from the metal case. Be sure not to damage components and touch them the least possible.
    -Turn the NS1 over to expose the compoment side.
    -with the USB port on the upper left side you can see a light brown trimmer (it’s the only one of this kind) with a small brass screw on the top.
    -our calibration procedure is the following:
    1. connect to a pc with a midi software
    2. connect the v/oct input of the VCO to the DAC0 (as in the standard midi patch)
    3. put out a C2 note on, the DAC will output 0,00 V
    4. turn the TUNE pot fully counter clockwise (lowest freq) this should be more or less 30hz)
    5. now turn the tune pot up until your tuner sense a C
    6. now go the other C notes and, if sharp turn the trimmer slowly counterclockwise, if flat the contrary.
    7. repeat this for the octaves until everything feels OK
    (NOTE: if you have just a USB connection the DAC won’t be able to correclty output the last 2/3 notes of the 5 octaves, as the normal volts supply from a usb port or power supply is much less than 5V, normally 4,7V)

    Let me know how it goes!!!!!

    #1726

    mr.bijou
    Participant

    I got it. Now that I see it I think is pretty straightforward. Thanks for your help!

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