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4.) For the circuit below, V, = 0.7V and ß = 120. Design the BJT circuit to operate as a switch that turns on and off a motor that has an equivalent resistance of 550 when it is running. The switch should be ON when Vin = 4V. 수+8V Motor 550 Vin RB

4.) For the circuit below, V, = 0.7V and ß = 120. Design the BJT circuit to operate as a switch that turns on and off a motor that has an equivalent resistance of 550 when it is running. The switch should be ON when Vin = 4V. 수+8V Motor 550 Vin RB

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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**Problem Statement:** For the circuit below, \( V_{\gamma} = 0.7V \) and \( \beta = 120 \). Design the BJT (Bipolar Junction Transistor) circuit to operate as a switch that turns on and off a motor that has an equivalent resistance of \( 55 \Omega \) when it is running. The switch should be ON when \( V_{\text{in}} = 4V \). **Circuit Description:** - **Components:** - A BJT transistor used as a switch. - A motor with an equivalent resistance of \( 55 \Omega \). - A power supply providing \( +8V \) for the motor. - A resistor \( R_B \) connected to the base of the transistor. - Input voltage \( V_{\text{in}} = 4V \) used to control the transistor. - **Operation:** - The transistor is configured in a common-emitter configuration. - The input voltage \( V_{\text{in}} \) is applied to the base resistor \( R_B \). - The transistor turns on, acting as a closed switch to power the motor, when \( V_{\text{in}} = 4V \). **Objective:** Determine the appropriate value of the base resistor \( R_B \) to ensure the transistor fully turns on when the input voltage is 4V. **Graphical Elements:** - The schematic shows a typical BJT switch setup where the motor is connected in series with the collector. - Power supply (+8V) is positioned above the motor, indicating it powers the motor through the transistor. - The resistor \( R_B \) connects the input voltage \( V_{\text{in}} \) to the base of the transistor. **Design Considerations:** The transistor should saturate when \( V_{\text{in}} = 4V \) to engage the motor fully. Calculate \( R_B \) using the known \( \beta \), \( V_{\gamma} \), and current requirements for saturation based on the motor's resistance.
Transcribed Image Text:**Problem Statement:** For the circuit below, \( V_{\gamma} = 0.7V \) and \( \beta = 120 \). Design the BJT (Bipolar Junction Transistor) circuit to operate as a switch that turns on and off a motor that has an equivalent resistance of \( 55 \Omega \) when it is running. The switch should be ON when \( V_{\text{in}} = 4V \). **Circuit Description:** - **Components:** - A BJT transistor used as a switch. - A motor with an equivalent resistance of \( 55 \Omega \). - A power supply providing \( +8V \) for the motor. - A resistor \( R_B \) connected to the base of the transistor. - Input voltage \( V_{\text{in}} = 4V \) used to control the transistor. - **Operation:** - The transistor is configured in a common-emitter configuration. - The input voltage \( V_{\text{in}} \) is applied to the base resistor \( R_B \). - The transistor turns on, acting as a closed switch to power the motor, when \( V_{\text{in}} = 4V \). **Objective:** Determine the appropriate value of the base resistor \( R_B \) to ensure the transistor fully turns on when the input voltage is 4V. **Graphical Elements:** - The schematic shows a typical BJT switch setup where the motor is connected in series with the collector. - Power supply (+8V) is positioned above the motor, indicating it powers the motor through the transistor. - The resistor \( R_B \) connects the input voltage \( V_{\text{in}} \) to the base of the transistor. **Design Considerations:** The transistor should saturate when \( V_{\text{in}} = 4V \) to engage the motor fully. Calculate \( R_B \) using the known \( \beta \), \( V_{\gamma} \), and current requirements for saturation based on the motor's resistance.
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