User Manual

Note that the 5-snap wire is under the programmable fan (M8),
partially hidden. Push any button on the selector (S8). The
programmable fan spins and displays a message.
Note that the 5-snap wire is under the programmable fan (M8),
partially hidden. Push any button on the selector (S8). The
programmable fan spins.
!
WARNING: Moving parts. Do not
touch the fan while it is spinning.
!
WARNING: Moving parts. Do not
touch the fan while it is spinning.
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Project 149
Selector with Word Fan
Project 150
Select the Fan
The selector (S8) cannot control the
programmable fan directly, so this circuit
uses the NPN transistor (Q2) to help. A
small electric current flowing into the
transistor through the selector controls a
larger current flowing into the transistor
through the programmable fan.
This circuit is like the preceding one,
except the programmable fan is
reversed. The motor inside it spins the
opposite direction, but the LED circuit in
it does not function when reversed.