termometro digital - 3 Termómetro digital Material...

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3.- Termómetro digital Material necesario: 10 resistencias de 1K 4 Diodos LED Termistor NTC Circuito integrado LM339
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Funcionamiento Se trata de un circuito que va encendiendo los LED sucesivamente a medida que aumenta la temperatura. Se compone básicamente cuatro amplificadores operacionales montados como comparadores. Utilizamos un solo circuito integrado (el LM339) que contiene los cuatro A.O. con la configuración indicada en la figura. La salida de estos O.A. es a colector abierto , esto quiere decir que cuando la salida es un 1 (input+ > input-) el terminal output se halla a 9V y por tanto el LED apagado y cuando la salida es un 0 (input+ < input-) el terminal output se halla a 0V y por tanto el LED encendido Por eso, en este caso la señal procedente del sensor ( Divisor de tensión formado por la NTC y R11 ) se aplica a todas las (input-) mientras que a las (input+) les aplicamos la tensión de alimentación divida por medio del divisor de tensión formado por R1-R2-R3-R4-R5, es decir Tensión aplicada a las (input + ) IC4 9 * 1/5 V.
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