Speed Change; Fan Power 2 - Elenco Electronics SC3DMEG Instruction Manual

Project 99
Note: If the LED
assembly fit seems
loose add a 1-snap
wire between one of
the 3D snaps and a V1.
Project 100
-65-

Speed Change

Build the circuit as shown; mounting the gear insert and
the small gear on the orange motor (M9). Place the
magnet in the center of the gear.
Turn the slide switch (S1) on; the gear rotates, and the
blue LED (D9) lights as a melody plays. Rotate reed
switch to different positions.
When the end of the magnet is towards the reed switch
(S9), the reed switch turns on. The orange motor slows,
the red LED (D11) starts blinking, and the blue LED and
melody IC (U32) turn off until the magnet end passes.
Fan Power
Build the circuit shown. Blow on the
fan so the clear motor (M4) generates
enough voltage to light the blink red
LED (D11).
Now place the color2 LED (D12)
across base grid locations B4-D4 (+ at
D4). Blow on the fan again to light
both LEDs.
Project 101

Fan Power 2

Use the preceding circuit, but
place the blue LED (D9)
across base grid locations B4
& D4 and the melody IC
(U32) across B5 & D5 (+ at
bottom). The fan really needs
to spin very fast for all the
LEDs to light and the melody
IC to make sound.