3.-comparadores-2013
TRANSCRIPT
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Comparadores con Amplificadores Operacionales
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Característica del Amplificador Operacional Real
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+
-
+Vcc
-Vcc
E
S
S
E
+Vcc
-Vcc
COMPARADOR SIMPLE
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COMPARADOR SIMPLE CON TENSIÓN
+
-
+Vcc
-Vcc
S
S
+Vcc
Vcomp
Vcomp
Vcomp
E
E
-Vcc
+Vcc
S
E
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+
-
+Vcc
-Vcc
E
S
R1R2
R3
V
-Vcc
+Vcc
S
E
+
V(E )V(E )
V(E )= Vcc R2/(R1+R2)
V(E )= - Vcc R2/(R1+R2)
COMPARADOR CON HISTERESIS
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+
-
+Vcc
-Vcc
Vc
S
R1R2
V
+
C
R3
+Vcc
-Vcc
Vc+Vcc
-Vcc
t
V(E )
V(E )
S
t
Circuito Aestable. OSCILADOR. GENERADOR DE PULSOS
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Circuito Monoestable Sencillo
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Símbolo de un Monoestable
T = 0,7 Rext * Cext
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Monoestable no redisparable
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Monoestable no redisparable 74121
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Monoestable redisparable 74LS122
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Monoestable redisparable 74LS122
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Temporizador 555. Funcionamiento monoestable
T=1,1* R1*C1
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Temporizador 555. Funcionamiento aestable
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Temporizador 555. Funcionamiento aestable