Page 98 - 15 Dangerously Mad Projects for the Evil Genius

Chapter 7 ■ Laser-Grid Intruder Alarm 77

Box Lid from Underside

Power Socket +
R2
LED
R1
+
(long)
c e (long)
R4
R3
Laser +
Laser –

Phototransistor Power Socket –

Buzzer +

Buzzer –
Figure 7-6 Wiring diagram

Figure 7-7 The box lid, main components attached