Lab 4 transistor switching circuits
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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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Capacitive loads

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


Risetime

Vmax

90%

10%

10-90% risetime

Risetime


Lc load

5 V

0 V

+5 V

2N7000

470 Ω

100 μH

Vout

3.3 kΩ

2N7000

Vin

10 kΩ

0.1 μF

LC Load


S domain analysis

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


Dc fan and driver

+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


Inductive spiking

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


Boost converter

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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