Fig. 1 shows an oscillator circuit using 555 timer, with RA = 1.5KQ, R = 2.5KQ Vcc= 12 V, and C= 0.7215uF. Assume the diode is ideal, then 1 The charging time (T) (in ms) 2 The duty cycle (ratio) 3 The frequency of the output signal (in Hz) If the diode is disconnected, then 4 The discharging time (7₂) (in ms) The duty cycle (ratio) 5 6 8 9 10 The frequency of the output signal (in Hz) VR₁ RA wwww Ra "IF +Vcc Discharge Threshold Trigger Ground D₂ D₁ Fig 3 Reset +12 -12 +Vcc 555 Output 45 vo VEE= A 1.25 0.375 666.7 Voltage transfer c/c 1.5 0.615 500 2.8 3.0 12 The discharging time (Tdisch) of this circuit ( in msec ) is Consider the circuit shown in Fig. 3 where Vz=3.3V, V=4.3V, and ± VSAT= ±12 V. Then 13 The maximum output voltage 4.0 5.0 14 The minimum output voltage - 4.0 -5.0 15 Draw to scale the transfer characteristics. 16 Draw to scale the input and the output signals when Vin is a triangle wave of 8 Vp P-P ww RE VER B 0.5 0.667 0.333 307.8 1.75 0.6 307.7 1.4 4.0 093 2.0 3.0 10.5 1.8 C Fig. 1 Fig. 2 Consider the sweep generator circuit shown in Fig. 2 where RE= 4KS2, RB = 4.7KS2, VEE=30.7V, VBB= 20V, and C= 0.5 µF. The control signal (v) has a pulse duration of 0.5ms, a frequency of 500Hz, and a +12V amplitude. Then 7 The emitter current IE (in mA) 2.5 3.5 The charging time of the capacitor (in ms) 2.5 1.5 The peak voltage of the capacitor (Vp) 6.0 9.0 1.5 The minimum value of Rg that we can use and still obtain a linear sweep waveform (in KS) 1.2 Consider a Schmitt trigger circuit with ± VSAT = 12 V, Vur=4V, and VLT=0V. This circuit is modified to be an oscillator circuit by adding C=3.46 µF and R=2 KS2. Then 11 The charging time (Tch) of this circuit (in msec) is 1.0 د 500 1.25 0.5 400 4.2 1.0 11 12 -0.7 D 0.75 0.5 400 1.0 0.75 666.7 ww 3.0 2.0 0051 Lj 7.5 2.1 5.6 2.0 0.7 - 12 Your ans. input and output
Fig. 1 shows an oscillator circuit using 555 timer, with RA = 1.5KQ, R = 2.5KQ Vcc= 12 V, and C= 0.7215uF. Assume the diode is ideal, then 1 The charging time (T) (in ms) 2 The duty cycle (ratio) 3 The frequency of the output signal (in Hz) If the diode is disconnected, then 4 The discharging time (7₂) (in ms) The duty cycle (ratio) 5 6 8 9 10 The frequency of the output signal (in Hz) VR₁ RA wwww Ra "IF +Vcc Discharge Threshold Trigger Ground D₂ D₁ Fig 3 Reset +12 -12 +Vcc 555 Output 45 vo VEE= A 1.25 0.375 666.7 Voltage transfer c/c 1.5 0.615 500 2.8 3.0 12 The discharging time (Tdisch) of this circuit ( in msec ) is Consider the circuit shown in Fig. 3 where Vz=3.3V, V=4.3V, and ± VSAT= ±12 V. Then 13 The maximum output voltage 4.0 5.0 14 The minimum output voltage - 4.0 -5.0 15 Draw to scale the transfer characteristics. 16 Draw to scale the input and the output signals when Vin is a triangle wave of 8 Vp P-P ww RE VER B 0.5 0.667 0.333 307.8 1.75 0.6 307.7 1.4 4.0 093 2.0 3.0 10.5 1.8 C Fig. 1 Fig. 2 Consider the sweep generator circuit shown in Fig. 2 where RE= 4KS2, RB = 4.7KS2, VEE=30.7V, VBB= 20V, and C= 0.5 µF. The control signal (v) has a pulse duration of 0.5ms, a frequency of 500Hz, and a +12V amplitude. Then 7 The emitter current IE (in mA) 2.5 3.5 The charging time of the capacitor (in ms) 2.5 1.5 The peak voltage of the capacitor (Vp) 6.0 9.0 1.5 The minimum value of Rg that we can use and still obtain a linear sweep waveform (in KS) 1.2 Consider a Schmitt trigger circuit with ± VSAT = 12 V, Vur=4V, and VLT=0V. This circuit is modified to be an oscillator circuit by adding C=3.46 µF and R=2 KS2. Then 11 The charging time (Tch) of this circuit (in msec) is 1.0 د 500 1.25 0.5 400 4.2 1.0 11 12 -0.7 D 0.75 0.5 400 1.0 0.75 666.7 ww 3.0 2.0 0051 Lj 7.5 2.1 5.6 2.0 0.7 - 12 Your ans. input and output
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Transcribed Image Text:Fig. 1 shows an oscillator circuit using 555 timer, with RA = 1.5KQ, RB =
2.5KQ Vcc= 12 V, and C= 0.7215uF. Assume the diode is ideal, then
1
2
3
If the diode is disconnected, then
4
5
6
The charging time (T,) (in ms)
The duty cycle (ratio)
The frequency of the output signal (in Hz)
10
16
The discharging time (T₂) (in ms)
The duty cycle (ratio)
The frequency of the output signal (in Hz)
V R₁
RA
RB
11
+Vcc
Discharge
Threshold
Trigger
Ground
D,
Fig 3
Reset
555 Output
+12
5-12
+Vcc
45
vo
VEE
A
1.25
0.375
666.7
The minimum output voltage
Draw to scale the transfer characteristics.
Draw to scale the input and the output signals when Vin is a triangle wave of 8 Vp-p
1.5
0.615
500
Voltage transfer c/c
ww
RE
VER
Fig. 1
Fig. 2
Consider the sweep generator circuit shown in Fig. 2 where RE = 4KS2, RB = 4.7K2, VEE=30.7V, VBB= 20V, and C= 0.5 uF.
The control signal (v) has a pulse duration of 0.5ms, a frequency of 500Hz, and a +12V amplitude. Then
7
2.5
3.5
8
9
The emitter current I (in mA)
The charging time of the capacitor (in ms)
2.5
The peak voltage of the capacitor (Vp)
6.0
The minimum value of Rg that we can use and still obtain a linear sweep 1.5
waveform (in K2)
Consider a Schmitt trigger circuit with ± VSAT = 12 V, Vur=4V, and Vir=0 V. This circuit is modified to be an oscillator
circuit by adding C= 3.46 µF and R=2 KS2. Then
11 The charging time (Tch) of this circuit (in msec) is
2.8
12 The discharging time (Tdisch) of this circuit ( in msec ) is
3.0
Consider the circuit shown in Fig. 3 where Vzi = 3.3V, VA= 4.3V, and ± VSAT = ±12 V. Then
13 The maximum output voltage
4.0
5.0
14
-4.0
- 5.0
15
B
C
0.5
1.0
0.667 0.333
307.8
500
1.4
4.0
1.75
0.6
307.7
1.25
0.5
400
2.0
3.0
10.5
1.8
282
1.5
9.0
1.2
4.2
1.0
D
0.75
0.5
400
1.0
0.75
666.7
R₂
12
-0.7
LI
3.0
2.0
7.5
2.1
199
5.6
2.0
Your
ans.
0.7
- 12
input and output
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