Elenco Projects 102-305 - Manual (Page 19)

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Project #130
NPN Collector
OBJECTIVE: To compare
transistor circuits.
Project #131
NPN Emitter
Compare this circuit to that in
project #128, it is the NPN
transistor (Q2) version and
works the same way. Which
circuit makes the lamp (L2)
brighter? (They are about the
same because both transistors
are made from the same
materials).
OBJECTIVE: To compare
transistor circuits.
Compare this circuit to that in
project #129. It is the NPN
transistor (Q2) version and
works the same way. The same
principles apply here as in
projects #128-#130, so you
should expect it to be less bright
than #130 but as bright as #129.
Project #132
NPN Collector - Motor
OBJECTIVE: To compare
transistor circuits.
Project #133
NPN Emitter - Motor
This is the same circuit as in
project #130, except that it has
the motor (M1) instead of the
lamp. Place the motor with the
positive (+) side touching the
NPN and put the fan on it.
The fan will not move on most
settings of the resistor, because
the resistance is too high to
overcome friction in the motor. If
the fan does not move at any
resistor setting, then replace your
batteries.
OBJECTIVE: To compare
transistor circuits.
This is the same circuit as in
project #131, except that it has
the motor (M1) instead of the
lamp. Place the motor with the
positive (+) side to the right and
put the fan on it. Compare the
fan speed to that in project #132.
Just as the lamp was dimmer in
the emitter configuration, the
motor is not as fast now.
!
WARNING: Moving parts. Do not touch
the fan or motor during operation. Do
not lean over the motor.
Visit www.snapcircuits.net or page 74 to learn about Snap Circuits ® upgrade kits, which have more parts and circuits.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.