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A 555 timer configured to run as an astable mode oscillator is shown in Figure 1. If the output is needed to have 30% duty cycle, i) Determine the required value of Rị if R2 = 7kN. ii) Determine the frequency of the output. iii) Draw the charging and discharging phase of capacitor Cext and its relation with the output waveform. ASsume Vcc = 12 V.

A 555 timer configured to run as an astable mode oscillator is shown in Figure 1. If the output is needed to have 30% duty cycle, i) Determine the required value of Rị if R2 = 7kN. ii) Determine the frequency of the output. iii) Draw the charging and discharging phase of capacitor Cext and its relation with the output waveform. ASsume Vcc = 12 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
Section: Chapter Questions
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A 555 timer configured to run as an astable mode oscillator is shown in Figure 1. If the output is needed to have 30% duty cycle, i) Determine the required value of Rị if R2 = 7kN. ii) Determine the frequency of the output. iii) Draw the charging and discharging phase of capacitor Cext and its relation with the output waveform. ASsume Vcc = 12 V. +Vcc (4) |(8) R1 RESET Vcc (7) DISCH 555 D1 R2 (6) THRESH (3) OUT (2) TRIG (5) CONT GND :Cext 0.01 µF (1) 0.01µF Figure 1
Transcribed Image Text:A 555 timer configured to run as an astable mode oscillator is shown in Figure 1. If the output is needed to have 30% duty cycle, i) Determine the required value of Rị if R2 = 7kN. ii) Determine the frequency of the output. iii) Draw the charging and discharging phase of capacitor Cext and its relation with the output waveform. ASsume Vcc = 12 V. +Vcc (4) |(8) R1 RESET Vcc (7) DISCH 555 D1 R2 (6) THRESH (3) OUT (2) TRIG (5) CONT GND :Cext 0.01 µF (1) 0.01µF Figure 1
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