Manual

-18-
Assembly (adult supervision recommended). Follow these assembly
instructions in order:
1. Place base grid supports on the base grid labeled A in the drawing.
2. Place parts on grid B, and install into base grid support on grid A.
3. Place parts on grid C (except the vertical snap wire (V1) that connects
to grid B, and the 2-snap wire that attaches to it), and install into base
grid supports on grid A. Finish connection of the V1 connecting
between grids B-C, add the 2-snap wire that attaches to it, and add
the stabilizer between grids B & C.
4. Install remaining parts on grid A.
5. Add the mirror and Q4 attachment.
Turn on the slide switch (S1). The light tunnel (U30) and color LED (D8) put
on a show. To trigger an alarm, align the mirror so light from the white LED
(D6) reaches the phototransistor (Q4); remove and re-install it in the spring if
needed. Try giving the mirror a push so it bounces back and forth on the spring.
You can swap the locations of the white and color LEDs (D6 & D8), but
in some cases the color LED may not activate the alarm.
Go to www.snapcircuits.net/sc3di for an interactive 3D picture to help
with contructing this circuit.