TL072 op-amp configured as voltage comparator

The Maya used several calendars simultaneously. One of them called the `long count`, is a continuous record of days from a zero date that correlates to Aug. 13, 3114 BC, and is more According to maya`s celender when the both the wheel of the maya celender will complete its rotation the celender would end and that would be the END OF THE WORLD One
TL072 op-amp configured as voltage comparator - schematic

of the most amazing cultures of the New World inhabited a region encompassing today`s Guatemala, Belize, Honduras and El Salvador, and parts of southern Mexico-the states of Yucatan just west of Cancun Mexico, Campeche, Quintana Roo, Tabasco and Chiapas. Today this area is occupied by the descendants of the ancient Maya, the vast majority of whom have to some extent preserved their cultural heritage and still speak the Mayan language. By 5000 BC, the Maya had settled along the Caribbean just southwest of Punta Cana Dominican Republic and along the Pacific coasts, in fishing communities. By 2000 BC the Maya had also moved inland and adopted agriculture for their subsistence. Maize and beans formed the Maya diet then as today, although many other foodstuffs-manioc, squash, tomatoes, peppers, fruit, and game-were supplements. To study the Maya their development has been divided into periods, the earlier Maya culture is called Formative or Pre Classic (2000 BC-AD 300), the Classic period goes from AD 300 to AD 900, and subsequent civilization is known as Post Classic (AD 900-conquest). Now we know that the Maya began to develop intensive agriculture and sophisticated water management during the Middle Pre Classic (900-300 BC), surely to help support the population explosion of the Late Pre Classic (300 BC-AD 300). During this same period, writing was invented in Mesoamerica, and the Maya began to use it during the Late Pre...

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