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SOUND
LE:'
Build
the
G'amtro!
Rumpus
Roma
Noise
BY A.
J. LOWE
April,
1969
DID YOU EVER wish you knew how to
quiet a noisy bunch of youngsters
when they are cutting up
in
the
rumpus
room? No matter how many times
you
tell them to keep the
racket
down, they
always claim that they were not making
that much
noise. With
the aid of the
"Riot
Restrainer,"
you can predetermine just
how loud
a
racket
you'll
permit them
to
make
; and, if
they
exceed it, this sim-
ple
electronic device
will
let
them
know
-in
no uncertain terms !
Besides helping keep
a bunch of young-
sters under control,
the
Riot Restrainer
can
double as an alarm to signal when
the baby
is
crying, as a
noise-
sensitive
burglar alarm,
or
as
a
snore alarm to
inform
the culprit that
he
(or she) is
keeping even the electronic equipment
awake.
The device is
a
sound
-trigger alarm
with the circuit shown
in Fig. 1. It
will
turn on an external alarm at any sound
level from
a
footstep
to
a
first
-class
riot.
The
alarm
is
on for a predetermined
time;
and,
if
the hubbub has died
down when
the
alarm stops, it remains silent. If
the
noise is
still
present
after another
"sens-
47
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