Manual
Project 30
Assembly:
1. Place base grid supports on base grid A.
2. Place parts on grids B&C, and install into base grid supports on grid A.
3. Install remaining parts on grid A.
Turn on the slide switch (S1); the white LED (D6) and horn (W1) are on.
Place your hand to block the light between the white LED and
phototransistor (Q4); the sound stops. If the sound is on even if you block
the light from the white LED then room light may be keeping it on, try pointing
the phototransistor away from room light.
-36-
Block the Sound
+
IFNEEDED