EuroSynth Specification

Signal Specifications - LOGIC

GATE Signals

GATE signals have only 2 recognised states being:-

  1. OFF or logic 'lo', and
  2. ON or logic 'hi'

These states are defined by the 'resting' level of the GATE and not by its edge-transition.

GATE IN (RED)

  • Nominally, these 2 states would be 0V and +5V +/-10% respectively.
  • The transition between states should, ideally, be instantaneous
  • The nominal Trip Threshold should be 1.5V+/-0.1%.
  • To cater for signals from the other categories, the definition of the 2 states and the Trip Threshold is expanded as follows:-

    • OFF: Any voltage below 1V will be recognised as logic 'lo' or OFF
    • ON: Any voltage above 2V will be recognised as logic 'hi' or ON

GATE OUT (YELLOW

GATE OUT outputs will be 0V and +5V +/-1%

GATE signals can extend in frequency from 0Hz to greater than 15kHz


TRIGGER Signals

TRIGGER signals are a variation of the GATE signal that depend on the edge-transition of the signal and not its 'resting' level.

TRIGGER IN (RED)

  • TRIGGER IN signals should have a minimum slew of 0.3V/uSec
  • TRIGGER IN should have a maximum transition time of 10uSec

TRIGGER OUT (YELLOW)

  • TRIGGER OUT outputs will be 0V and +5V +/-1%. They must swing from below 1V to above 2.5V

TRIGGER signals can extend in frequency from 0Hz to greater than 15kHz.

A EuroRack Trigger is simply a GATE with a short 'ON' period, typically 1mS to 5mS.
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