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Transistor Switching Circuits Lab: Analysis and Applications of 2N3904 and 2N7000

Explore the intricate workings of transistor switching circuits in this comprehensive lab focused on the 2N3904 and 2N7000 transistors. Learn to design and analyze circuits powered by a +5V and +12V DC supply, including DC motors, fans, and inductive loads. Discover the effects of capacitive and inductive components, switching characteristics, and performance metrics like rise time and efficiency. This hands-on approach will provide you with the fundamental knowledge needed to effectively utilize transistors in various electronic applications.

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Transistor Switching Circuits Lab: Analysis and Applications of 2N3904 and 2N7000

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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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