User Manual

Turn on the slide switch (S1). The green LED (D2) comes on (indicating
the circuit is ready), but otherwise nothing happens. Break the black
jumper wire connection and an alarm sounds, lights shine, and things
spin. You could replace the black jumper wire with a longer wire and
run it across a doorway to signal an alarm when someone enters.
-47-
This circuit is like the preceding one, except with better sound and without the disco
motor (DM). Turn on the slide switch (S1). The green LED (D2) comes on (indicating
the circuit is ready), but otherwise nothing happens. Break the black jumper wire
connection and an alarm sounds. You could replace the black jumper wire with a
longer wire and run it across a doorway to signal an alarm when someone enters.
Project 116 Trip-Wire Machine Gun
Use either of the preceding circuits, but connect
the red jumper wire between the points marked
B & C. Now it sounds like a machine gun.
Use either of the
preceding circuits,
but connect the red
jumper wire between
the points marked A &
D. Now it sounds like
a European siren.
Project 115
Trip-Wire Alarm with Better Sound
Project 118
Trip-Wire
European Siren
Project 117 Trip-Wire Fire Engine
Use either of the preceding circuits, but connect
the red jumper wire between the points marked
A & B. Now it sounds like a fire engine.
Project 114
Trip-Wire Alarm
The siren sounds in this
project may seem distorted
compared to other projects.
This is because electrical
noise generated by the
motor in the disco motor
(DM) disrupts the alarm IC
(U2). Compare this circuit to
following one.
Disco Cover
SUPPORT BAR