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17. At what anode voltage (VA) will each PUT in Figure 11–60 begin to conduct? VB +20 V VB +9 V R2 12 ΚΩ VAO R2 47 kN VAO R1 470 N R3 10 kN R 330 N R3 47 kM (a) (b)

17. At what anode voltage (VA) will each PUT in Figure 11–60 begin to conduct? VB +20 V VB +9 V R2 12 ΚΩ VAO R2 47 kN VAO R1 470 N R3 10 kN R 330 N R3 47 kM (a) (b)

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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**Question:** 17. At what anode voltage (\(V_A\)) will each Programmable Unijunction Transistor (PUT) in Figure 11–60 begin to conduct? **Figure 11-60 Details:** - **Diagram (a):** - The circuit includes a PUT with the anode connected to \(V_A\). - \(V_B = +20 \, V\), connected through \(R_2 = 12 \, k\Omega\). - \(R_1 = 470 \, \Omega\) is in series with the cathode. - \(R_3 = 10 \, k\Omega\) connects the gate to ground. - **Diagram (b):** - The circuit includes a PUT with the anode connected to \(V_A\). - \(V_B = +9 \, V\), connected through \(R_2 = 47 \, k\Omega\). - \(R_1 = 330 \, \Omega\) is in series with the cathode. - \(R_3 = 47 \, k\Omega\) connects the gate to ground. **Explanation:** To find the anode voltage \(V_A\) at which each circuit begins to conduct, calculate the voltage at the gate and compare it with the anode's voltage. The PUT conducts when the anode voltage \(V_A\) exceeds the gate voltage by the intrinsic stand-off ratio (typically a small voltage drop internal to the PUT, needed for conduction). Adjust resistor values to understand the voltage division at the gate.
Transcribed Image Text:**Question:** 17. At what anode voltage (\(V_A\)) will each Programmable Unijunction Transistor (PUT) in Figure 11–60 begin to conduct? **Figure 11-60 Details:** - **Diagram (a):** - The circuit includes a PUT with the anode connected to \(V_A\). - \(V_B = +20 \, V\), connected through \(R_2 = 12 \, k\Omega\). - \(R_1 = 470 \, \Omega\) is in series with the cathode. - \(R_3 = 10 \, k\Omega\) connects the gate to ground. - **Diagram (b):** - The circuit includes a PUT with the anode connected to \(V_A\). - \(V_B = +9 \, V\), connected through \(R_2 = 47 \, k\Omega\). - \(R_1 = 330 \, \Omega\) is in series with the cathode. - \(R_3 = 47 \, k\Omega\) connects the gate to ground. **Explanation:** To find the anode voltage \(V_A\) at which each circuit begins to conduct, calculate the voltage at the gate and compare it with the anode's voltage. The PUT conducts when the anode voltage \(V_A\) exceeds the gate voltage by the intrinsic stand-off ratio (typically a small voltage drop internal to the PUT, needed for conduction). Adjust resistor values to understand the voltage division at the gate.
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