Data Sheet

Project 95 Rocking Switch
Build the circuit, then place the magnet across the base grid
supports as shown. Turn on the slide switch (S1) and the red
LED (D11) starts blinking. Slowly rotate the reed switch (S9)
towards the magnet. When the reed switch is close enough to
the magnet the switch closes, the lamp (L4) lights, and the LED
turns off.
The magnetic field holding the switch closed decreases as the
switch moves past the magnet. The switch opens again, lamp
turns off, and the LED blinks.
Project 96
Disco Ball Switch
Use the preceding circuit. Place the orange
motor (M9) across base grid locations F4 &
F6 on level 1. Connect the motor across the
lamp using two blue jumper wires (J4). Mount
the mirror ball on the motor and move the
reed switch (S9) away from the magnet. Turn
on the slide switch (S1); when the reed switch
is on, the disco ball rotates and the lamp
lights.
Project 97
Rocking Switch LEDsDisco Ball Melody
Use project 95. Place the color2 LED (D12)
and the blue LED (D9) across base grid
locations F4 & F6 and G4 & G6 on level 1.
Connect the LEDs using 2-snaps across F4
& G4 and F6 & G6 on level 2. Place two blue
jumper wires (J4) across E4 & F4 and E6 &
F6. Now, all lights turn on when the reed
switch is closed.
Project 98
Use the preceding circuit, but replace the
lamp (L4) with the melody IC (U32, + on
left). Turn on the slide switch (S1); when
the reed switch (S9) is closed the disco
ball rotates and the melody IC sounds.
-64-
Reed switches are used in
security systems to indicate if a
door or window is opened.
Note: If the LED
assembly fit seems
loose add a 1-snap
wire between one of
the 3D snaps and a V1.
SC-3DMEG_Manual.qxp_SC-3Di_Manual_060816 6/19/17 7:32 PM Page 65