The ES11 consists of three independent functions which are useful in the production of square waves and variable pulse waves.
The Comparator reference level can be a time-varying control voltage, a complex audio signal, or a fixed preset voltage. Additionally, the comparators are useful for level detection and for logic decisions based on amplitude.
The module also contains a single, non-adjustable, Schmitt Trigger. This is a single-input comparator with hysteresis. Hysteresis means that the switching thresholds are different for an input signal depending upon whether it is going up or down. This feature can be used with an envelope and VCA functioning as a noise gate to reject low-level background noise in audio applications.
The Schmitt trigger output will rise to about 5 volts when the input falls below approximately 0.6 volts and will fall to approximately 0 volts when the input rises over approximately 4.3 volts.