R11 Triple Comparator and Schmitt Trigger
From a 1970s catalog: The TRIPLE COMPARATOR (COM) 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 schematic for the 1973 version.
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