Available as an assembled Module and as a DIY project.
This Module is currently available.
Triple Comparator and Schmitt Trigger
The Triple Comparator and Schmitt Trigger 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. The output of the Schmitt trigger 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.
https://www.elby-designs.com/webtek/euro-serge/es11-triple-comparator/es11.htm
3 Users are observing this
These merchants probably sell this module. Huh?