122-28176 Parallax Inc, 122-28176 Datasheet - Page 150

• 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