isis professional - h__delay dung ic555 cho at89_mach delay_ic555.dsn
Post on 13-Apr-2015
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R4
DC 7
Q 3
GN
D1
VC
C8
TR2 TH 6
CV5IC555
R1
R2
Vcc=+5v
C1
103
Out
T (s); f (Hz); R1,R2 (Ohm); C1 (F);
Tm
T
Ts
T=Tm+Ts
(Thôøi gian möùc 1) (Thôøi gian möùc 0)
(Thôøi gian möùc caû chu kyø xung)
Tm = 0.7x(R1+R2)xC1
Ts = 0.7xR2xC1
--> T = 0.7x(R1+2xR2)xC1 (s)
f = 1/T = 1.4/[(R1+2xR2)xC1] (Hz)
R4
DC 7
Q 3
GN
D1
VC
C8
TR2 TH 6
CV5IC555
2k2Vcc=+5v
10uF
103
Out
104
VD1: R1=2200 (Ohm); R2=0 (Ohm); C1=10^(-5) (F);
--> T = 0.7x(R1+2xR2)xC1 = 0.7x(2200+2x0)x10^(-5) = 0.0154(s) = 15.4 (ms)
f = 1/T = 1.4/[(R1+2xR2)xC1] = 1/0.0154 = 65 (Hz)
VD1: R1=2200 (Ohm); R2=104=100000 (Ohm); C1=10^(-5) (F);
--> T = 0.7x(R1+2xR2)xC1 = 0.7x(2200+2x100000)x10^(-5) = 0.7154(s) = 715.4 (ms)
f = 1/T = 1.4/[(R1+2xR2)xC1] = 1/0.7154 = 1.4 (Hz)
Coâng Thöùc Tính Chu Kyø vaø Taàn Soá Cho IC555
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