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Lab #4 – Transistor Switching Circuits

Lab #4 – Transistor Switching Circuits. V DD. +5 V. 2N3904. I o. R. 1 k Ω. I c. V out. V out. V out. 100 k Ω. C. C. 2N3904. V in. 5 V. 0.1 μ F. 0 V. V DD. +5 V. 10 k Ω. 2N3906. V out. V in. V out. 10 k Ω. V in. 2N3904. 0.1 μ F. 0.1 μ F. Capacitive Loads. V max.

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Lab #4 – Transistor Switching Circuits

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  1. Lab #4 – Transistor Switching Circuits

  2. VDD +5 V 2N3904 Io R 1 kΩ Ic Vout Vout Vout 100 kΩ C C 2N3904 Vin 5 V 0.1 μF 0 V VDD +5 V 10 kΩ 2N3906 Vout Vin Vout 10 kΩ Vin 2N3904 0.1 μF 0.1 μF Capacitive Loads

  3. Vmax 90% 10% 10-90% risetime Risetime

  4. 5 V 0 V +5 V 2N7000 470 Ω 100 μH Vout 3.3 kΩ 2N7000 Vin 10 kΩ 0.1 μF LC Load

  5. VDD VDD R R L Vout L Vout sL Vout t = 0 1/sC C C Ron Ron VDD/s VDD VDD R R L Vout L Vout sL Vout R t = 0 1/sC C C VDD/s Ron S-domain Analysis

  6. +12 V DC motor/fan 2N7000 0.1 μF Vin M DC Fan and Driver • DC Brushless Fan • 12VDC • Dimensions: 1.60"W x 1.60"H x 0.40"D • 6.7CFM • Ball • Current: 100mA • Power: 1.2 watts • Agency approvals: UL/CUL/TUV/CE • Noise: 25dBA • Connection: 10" W/Connectors FAN,12VDC,6.7CFM,1.6"SQ X .40"BALL,10" LEADS, UL/CUL/CE

  7. 2N7000 +5 V +5 V 100 μH 100 μH Vout 0.1 μF Vout 2N7000 Vin 2N7000 Vin 5 V 100 Ω 5 V 10 Ω 0 V 10 Ω 0 V f = 100 kHz Inductive Spiking This circuit gives a nice demonstration of ringing for a 2kHz input

  8. 2N7000 +5 V 100 μH Vout 2N7000 RL Vin 5 V 10 μF 100 kΩ 22 Ω 0 V Boost Converter

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