Q3. A relaxation oscillator is to generate train of pulses that is used to fire a Thyristor circuit in a controlled rectifier and, it is known that the external capacitor C=0.1uF and firing pulses are taken across 120n with the following data of the relaxation oscillator. VBB=15V; Rg8=4.7k; ;-0.7; the valley voltage is=0.9V; l,-10µA; the valley current is=12mA; Re1 during discharge =900 Determine the followings; į. The value of Vp to switch-on the UJT; ii. The range of R1 to switch-on and switch-off the UJT; iii. Frequency of oscillation with drawing;

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Author:Robert L. Boylestad
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Q3. A relaxation oscillator is to generate train of pulses that is used to fire a Thyristor circuit in a
controlled rectifier and, it is known that the external capacitor C=0.1uF and firing pulses are
taken across 1200 with the following data of the relaxation oscillator.
VBB=15V; RBB=4.7ko; =0.7; the valley voltage is=0.9V; Ip=10µA; the valley current is=12mA; RB1 during
discharge =900
Determine the followings;
į. The value of Vp to switch-on the UJT;
ii. The range of R, to switch-on and switch-off the UJT;
iii. Frequency of oscillation with drawing;
Transcribed Image Text:Q3. A relaxation oscillator is to generate train of pulses that is used to fire a Thyristor circuit in a controlled rectifier and, it is known that the external capacitor C=0.1uF and firing pulses are taken across 1200 with the following data of the relaxation oscillator. VBB=15V; RBB=4.7ko; =0.7; the valley voltage is=0.9V; Ip=10µA; the valley current is=12mA; RB1 during discharge =900 Determine the followings; į. The value of Vp to switch-on the UJT; ii. The range of R, to switch-on and switch-off the UJT; iii. Frequency of oscillation with drawing;
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