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1.a. What are the two comparator reference voltages in a 555 timer when Vcc = 10 V? 1.b. Determine the frequency of oscillation for the 555 astable oscillators in Figure. 1.c. To what value must Cext be changed to achieve a frequency of 25 kHz? +5.5 V

1.a. What are the two comparator reference voltages in a 555 timer when Vcc = 10 V? 1.b. Determine the frequency of oscillation for the 555 astable oscillators in Figure. 1.c. To what value must Cext be changed to achieve a frequency of 25 kHz? +5.5 V

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Choose any 4 Questions. Where appropriate, use figures and equations to aid explanation 1.a. What are the two comparator reference voltages in a 555 timer when Vcc = 10 V? 1.b. Determine the frequency of oscillation for the 555 astable oscillators in Figure. 1.c. To what value must Cext be changed to achieve a frequency of 25 kHz? +5.5 V 1.0 kn R₂ • 3.3 ΚΩ Cest 0.047μF RESET DISCH THRESH TRIG 555 GND Vec OUT CONT C₁ 0.01 F 1.d. In an astable 555 configuration, the external resistor R1 = 3.3 k. What must R2 equal to produce a duty cycle of 75%.
Transcribed Image Text:Choose any 4 Questions. Where appropriate, use figures and equations to aid explanation 1.a. What are the two comparator reference voltages in a 555 timer when Vcc = 10 V? 1.b. Determine the frequency of oscillation for the 555 astable oscillators in Figure. 1.c. To what value must Cext be changed to achieve a frequency of 25 kHz? +5.5 V 1.0 kn R₂ • 3.3 ΚΩ Cest 0.047μF RESET DISCH THRESH TRIG 555 GND Vec OUT CONT C₁ 0.01 F 1.d. In an astable 555 configuration, the external resistor R1 = 3.3 k. What must R2 equal to produce a duty cycle of 75%.
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