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Lab #4 – Transistor Switching Circuits
Capacitive Loads
+5 V
2N3904
VDD
Io
Vout
C
1 kΩ
Ic
R
Vout
Vout
100 kΩ
5V
C
2N3904
Vin
0.1 μF
0V
10 kΩ
2N3906
Vin
© Bob York
VDD
+5 V
Vout
Vin
Vout
10 kΩ
2N3904
0.1 μF
0.1 μF
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Risetime
Vmax
90%
10%
10-90% risetime
© Bob York
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LC Load
+5 V
2N7000
470 Ω
100 μH
Vout
3.3 kΩ
5V
0V
© Bob York
2N7000
Vin
10 kΩ
0.1 μF
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S-domain Analysis
VDD
VDD
R
R
L
Vout
L
Vout
sL
Vout
t=0
C
1/sC
C
Ron
Ron
VDD
VDD
R
R
L
Vout
L
VDD/s
Vout
R
sL
Vout
t=0
C
C
VDD/s
1/sC
Ron
© Bob York
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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
Jameco P/N
290010PS
Mfg
ADDA INC
Mfg #
ADO412HB-G70
RoHS?
No
In Stock
Yes
Voltage (VDC)
12
Size (W x H x D)
(inches)
1.60 x 1.60 x
0.40
Air Flow (CFM)
6.7
Bearing Type
Ball
Current (mA)
100
Power (Watts)
1.2
Noise (dBA)
25
Connection (Leads)
10
Agency Approvals
UL/CUL/TUV/CE
+12 V
M
Vin
© Bob York
DC motor/fan
2N7000
0.1 μF
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Inductive Spiking
2N7000
+5 V
100 μH
+5 V
100 μH
0.1 μF
Vout
Vout
2N7000
Vin
100 Ω
5V
10 Ω
0V
f = 100 kHz
2N7000
Vin
5V
0V
10 Ω
This circuit gives a nice demonstration
of ringing for a 2kHz input
© Bob York
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Boost Converter
2N7000
+5 V
100 μH
2N7000
Vin
5V
0V
© Bob York
22 Ω
10 μF
Vout
RL
100 kΩ
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