Data Sheet

-83-
Project 148
On Off 2
Use the preceding circuit, but replace the
lamp (L4) with the melody IC (U32).
Turn the slide switch (S1) on, the melody
IC (U32) sounds once when the reed
switch (S9) is closed and opened.
Project 149
Twice On Off
Use the project 147 circuit,
but re-position the reed switch
(S9) so it is across base grid
B locations D3-D5. Turn the
slide switch on; the lamp and
LED turn on and off twice as
the magnet passes the reed
switch.
Project 150
Twice On Off 2
Use the preceding circuit,
but replace the lamp (L4)
with the melody IC (U32, +
on top). Turn the slide
switch on; the melody IC
and LED turn on and off
twice as the magnet
passes the reed switch.
Project 151
Twice On Off 3
Use the project 158 circuit,
but place the clear motor
(M4) across the blue LED
(D9) on level 4. Turn the
slide switch on; the lamp,
LED, and motor turn on and
off twice as the magnet
passes the reed switch.
Project 147
On Off
Assembly :
1. Place base grid supports on base grid A.
2. Place parts on grids A but do not connect the
two jumpers wires.
3. Place the reed switch on grid B, then install grid
B on base grid supports on grid A. The pegs
must be pointed inward.
4. Connect the red & black jumper wires.
5. Install the gear insert and large gear (flat side
up) on the orange motor, then place the magnet
on the gear as shown.
Turn on the slide switch (S1); the blue LED (D9)
lights and the gear rotates. When the end of the
magnet faces the reed switch (S9) the switch
closes, bypassing the blue LED (D9). The blue
LED and lamp are turned on and off temporarily.
SC-3DMEG_Manual.qxp_SC-3Di_Manual_060816 6/19/17 7:34 PM Page 84