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Lab #4 – Transistor Switching CircuitsPowerPoint Presentation

Lab #4 – Transistor Switching Circuits

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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 LoadsVDD

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 AnalysisDC 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

+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 SpikingThis circuit gives a nice demonstration of ringing for a 2kHz input

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