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BJT Astable Multivibrator Similar to the MOSFET, we can also construct and astable multivibrator using NPN BJTS as seen in Figure 14. For the circuit in Figure 14, to solve for the oscillation frequency, we would use the same technique we used with the MOSFETs, by solving for the charging period for C1 and C2. In this case, to determine the period, T = 1/f, we need to solve for charge time for each leg of the multivibrator where T = t₁+t2. t₁ = 0.69C1R31 and t₂ = 0.69C2R52. Therefore, if C₁ = C₂ and RB1 = R32 then the frequency ƒ= 1/T = 1/(1.38RBC). For the circuit in Figure 14, solve for the flashing oscillation frequency for RB1=RB2=100kQ, Rc1=Rc2=6800, and C1-C2=10μF. Repeat your calculations for C1-C2=1μF. Rc1 Rcz +15 LED2 LED1 RB2 RB1 C₁ Q1 Ог 8 E C₂ GND Figure 14: NPN BJT Astable Multivibrator Circuit

BJT Astable Multivibrator Similar to the MOSFET, we can also construct and astable multivibrator using NPN BJTS as seen in Figure 14. For the circuit in Figure 14, to solve for the oscillation frequency, we would use the same technique we used with the MOSFETs, by solving for the charging period for C1 and C2. In this case, to determine the period, T = 1/f, we need to solve for charge time for each leg of the multivibrator where T = t₁+t2. t₁ = 0.69C1R31 and t₂ = 0.69C2R52. Therefore, if C₁ = C₂ and RB1 = R32 then the frequency ƒ= 1/T = 1/(1.38RBC). For the circuit in Figure 14, solve for the flashing oscillation frequency for RB1=RB2=100kQ, Rc1=Rc2=6800, and C1-C2=10μF. Repeat your calculations for C1-C2=1μF. Rc1 Rcz +15 LED2 LED1 RB2 RB1 C₁ Q1 Ог 8 E C₂ GND Figure 14: NPN BJT Astable Multivibrator Circuit

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
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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BJT Astable Multivibrator Similar to the MOSFET, we can also construct and astable multivibrator using NPN BJTS as seen in Figure 14. For the circuit in Figure 14, to solve for the oscillation frequency, we would use the same technique we used with the MOSFETs, by solving for the charging period for C1 and C2. In this case, to determine the period, T = 1/f, we need to solve for charge time for each leg of the multivibrator where T = t₁+t2. t₁ = 0.69C1R31 and t₂ = 0.69C2R52. Therefore, if C₁ = C₂ and RB1 = R32 then the frequency ƒ= 1/T = 1/(1.38RBC). For the circuit in Figure 14, solve for the flashing oscillation frequency for RB1=RB2=100kQ, Rc1=Rc2=6800, and C1-C2=10μF. Repeat your calculations for C1-C2=1μF.
Transcribed Image Text:BJT Astable Multivibrator Similar to the MOSFET, we can also construct and astable multivibrator using NPN BJTS as seen in Figure 14. For the circuit in Figure 14, to solve for the oscillation frequency, we would use the same technique we used with the MOSFETs, by solving for the charging period for C1 and C2. In this case, to determine the period, T = 1/f, we need to solve for charge time for each leg of the multivibrator where T = t₁+t2. t₁ = 0.69C1R31 and t₂ = 0.69C2R52. Therefore, if C₁ = C₂ and RB1 = R32 then the frequency ƒ= 1/T = 1/(1.38RBC). For the circuit in Figure 14, solve for the flashing oscillation frequency for RB1=RB2=100kQ, Rc1=Rc2=6800, and C1-C2=10μF. Repeat your calculations for C1-C2=1μF.
Rc1 Rcz +15 LED2 LED1 RB2 RB1 C₁ Q1 Ог 8 E C₂ GND Figure 14: NPN BJT Astable Multivibrator Circuit
Transcribed Image Text:Rc1 Rcz +15 LED2 LED1 RB2 RB1 C₁ Q1 Ог 8 E C₂ GND Figure 14: NPN BJT Astable Multivibrator Circuit
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