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Random*Source SERGE NTO Manual

New timbral oscillator for eurorack

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Serge NTO
SERGE
New Timbral Oscillator
(NTO)
The Serge NTO is an iconic Serge design and one of the rarest, most sought-after oscillators. To quote the
original 1983 Serge catalog:
ACCURATE TRACKING
When two or more oscillators are tuned, it is expected that they will remain in tune throughout their entire range (in other words,
that they track). Even two oscillators which track within a fraction of a semitone will be out of tune at the extremities of their range.
Therefore, the New Timbral Oscillators have been designed so that any two will track within one cycle/second throughout their
entire musical range.
TEMPERATURE STABILITY
Instability of pitch with changes in temperature is the criticism of most synthesizer VCO's. Performers are aware of the disastrous
effects of temperature when they must desperately retune oscillators that have drifted during a live performance. The temperature
sensitive components are kept at a static temerature by a solid-state "oven".
for Eurorack
RANDOMSOURCE.NET
RANDOM*SOURCE
The Serge New Timbral Oscillator (NTO) is the
state-of-the-art VCO, featuring exceptional
range, superb temperature stability, and
accurate tracking. Dynamic depth frequency
modulation and voltage control of waveform
allow unprecedented control over a wide range
of sound qualities.
EXPONENTIAL 1 VOLT/OCTAVE
RESPONSE
Exponential response parallels the response of
human hearing perception as well as musical
pitch structure. With multiple oscillators, each
must respond exponentially to control voltages
to allow transposition from key to key and to
produce alternative equal-tempered tunings
such as quarter and third tones. In addition, the
one-volt-per-octave response assures that the
New Timbral Oscillator is compatible with most
keyboard and computer controllers.
1

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Summary of Contents for Random*Source SERGE NTO

  • Page 1 New Timbral Oscillator (NTO) for Eurorack The Serge NTO is an iconic Serge design and one of the rarest, most sought-after oscillators. To quote the original 1983 Serge catalog: The Serge New Timbral Oscillator (NTO) is the state-of-the-art VCO, featuring exceptional range, superb temperature stability, and accurate tracking.
  • Page 2 • Direction of Portamento knob can be set to taste. • No wiring needed. The NTO by Random*Source is the only version licensed and authorized by Serge. RANDOMSOURCE.NET...
  • Page 3 RANDOM*SOURCE Serge NTO Technical Aspects: • Use antistatic precaution when handling the NTO pcbs - don’t touch the small SMD parts and ICs with your hands. • Only these parts have to be soldered in: 4 trimpots on the main pcb, an (optional) 470nF or 1uF film capacitor on the panel pcb, 5 pin stripes to connect the main pcb to the panel pcb, Euro power header.
  • Page 4: Bill Of Materials

    RANDOM*SOURCE Serge NTO Bill of Materials Trimmers 2 20k TEMP, HF-COMP Trimpot (Bourns 3362P, Vishay T73YP203KT20 or (25k also works for Single-turn recommended anything that matches the footprint) to adjust the oven TEMP) temperature and the high-frequency compensation. 1 100R...
  • Page 5 RANDOM*SOURCE Serge NTO Building This is simply a suggestion - you might find a different workflow more practical: Solder the trimmers and the power connector onto the main pcb. Solder the 470nF film cap onto the panel pcb. This capacitor is to remove any DC offsets from the signal going into the (black) Linear FM input.
  • Page 6 RANDOM*SOURCE Serge NTO Calibration Calibration should be pretty easy if you follow these steps - please beware that tracking is dependent of the oven temperature, i.e. changing the oven temperature requires (re-)calibration of the 1V/Oct trimmer! Oven Temperature and Tracking Connect the SAW output to speakers so you can listen to any changes.
  • Page 7: Power Consumption

    Depending on the oven setting (and environmental temperature), the NTO draws about 95mA to 115mA. Please note that a good power supply is essential for VCO performance. (Last Change: 14. May 2017, 3:58 PM) SERGE Modular by Random*Source. Module and circuit under license from Serge Tcherepnin. All rights reserved. RANDOMSOURCE.NET...