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Fig. 1 shows an oscillator circuit using 555 timer, with RA = 1.5KQ, R₁ = 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 The discharging time (T₂) (in ms) The duty cycle (ratio) The frequency of the output signal (in Hz) 15 16 RA V R₁ RR +Vcc Discharge Threshold Trigger Ground 11 D, Reset Fig 3 555 Output The emitter current I (in mA) The charging time of the capacitor (in ms) +Vcc 45 +12 vo -12 VEE A 1.25 0.375 666.7 1.5 0.615 500 2.8 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 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. ww RE Voltage transfer c/c 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 B 0.5 0.667 307.8 1.75 0.6 307.7 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 12 The discharging time (Tdisch) of this circuit ( in msec ) is 1.4 4.0 2.0 3.0 10.5 1.8 C 1.0 0.333 500 1.25 0.5 400 282 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 3.0 2.0 7.5 2.1 L 198 5.6 2.0 Your ans. 0.7 - 12 input and output

Fig. 1 shows an oscillator circuit using 555 timer, with RA = 1.5KQ, R₁ = 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 The discharging time (T₂) (in ms) The duty cycle (ratio) The frequency of the output signal (in Hz) 15 16 RA V R₁ RR +Vcc Discharge Threshold Trigger Ground 11 D, Reset Fig 3 555 Output The emitter current I (in mA) The charging time of the capacitor (in ms) +Vcc 45 +12 vo -12 VEE A 1.25 0.375 666.7 1.5 0.615 500 2.8 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 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. ww RE Voltage transfer c/c 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 B 0.5 0.667 307.8 1.75 0.6 307.7 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 12 The discharging time (Tdisch) of this circuit ( in msec ) is 1.4 4.0 2.0 3.0 10.5 1.8 C 1.0 0.333 500 1.25 0.5 400 282 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 3.0 2.0 7.5 2.1 L 198 5.6 2.0 Your ans. 0.7 - 12 input and output

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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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
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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