122-28176 Parallax Inc, 122-28176 Datasheet - Page 150
122-28176
Manufacturer Part Number
122-28176
Description
GUIDE STUDENT PROCESS CONTROL
Manufacturer
Parallax Inc
Specifications of 122-28176
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Propeller Education (PE) Kit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Replace the 2N3904 transistor that is connected to the fan with the BS170
MOSFET transistor to form the circuit shown in Figure 5-5. Be very careful to
observe the proper pin placement.
Test the circuit.
WARNING! The pinout for the BS170 is the reverse of the pinout for the 2N3904. The flat
side of the BS170 will be facing the opposite direction from the way the 2N3904 was facing.
Figure 5-4
Top: BS170 MOSFET
D = Drain
G = Gate
S = Source
Bottom: 2N3904 BJT
C = Collector
B = Base
E = Emitter
Figure 5-5
FET Driver and
BS170 Circuit
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