Data Sheet

Project 106
Fan Speed
Build the circuit as shown, mounting the gear insert and
the large gear on the orange motor (M9). Place the magnet
in the center of the gear.
Turn the switch on, the gear slowly rotates, the blue LED
lights and the fan spins. When the end of the magnet is
towards the reed switch the orange motor (M8) speeds up,
clear motor (M4) slows down and the blinking LED (D11)
gets brighter.
Project 107
If you have any extra
magnets compare
their strenth using
this project. See
which one can be
held farthest away
from the reed switch.
Project 108
-67-
Use the preceding circuit, remove
the magnet and hold it next to the
reed switch. The fan and blue LED
turn off, geared motor speeds up and
LED D11 is blinking. See how close
the magnet must be to the reed
switch.
Manual Fan Speed
Use the preceding circuit, remove the two snap
on B6 & C6. Turn the switch on, only LED D11
blinking and the fan spins slowly. Stop the fan by
placing the magnet next to the reed switch.
Fan Speed 2
SC-3DMEG_Manual.qxp_SC-3Di_Manual_060816 6/19/17 7:33 PM Page 68