Elenco Whooper Alarm - Manual

WHOOPER ALARM KIT
MODEL K-24
Instruction & Assemb
ly
Man
u
al
Cop
yr
ight © 2009, 1989 b
y
Elenco
®
Electronics
, Inc.
All r
ights reser
v
ed.
Re
vised 2009 REV
-F
753224
No par
t of this book shall be reproduced b
y
an
y means;
electronic
, photocop
ying, or otherwise without wr
itten per
mission from t
he pub
lisher
.
Elenco
®
Electr
onics,
Inc.
Elenco
®
Electr
onics,
Inc.
150 Car
penter A
v
en
ue
Wheeling, IL 60090
(847) 541-3800
W
ebsite:
www
.elenco
.com
e-mail:
elenco@elenco
.com
QU
IZ
1.
The
Whooper Alar
m has ___________ oscillators
.
2.
The lo
w frequency oscillations are gener
ated b
y
tr
ansistors __________ and __________.
3.
The high frequency oscillations are gener
ated b
y
tr
ansistors __________ and __________.
4.
When the po
w
e
r is first tur
ned on, the v
oltage at the base of Q2 is ___________.
5.
When the po
w
e
r is first tur
ned on, the v
oltage across C1 is ___________.
6.
Capacitor C1 charges through resistor _______ and discharges through resistor __________.
7.
The charge to discharged r
a
tio on C1 is ___________.
8.
Capacitor C3 causes tr
ansistor Q3 and Q4 to _____________.
9.
The frequency of oscillation of Q3 and Q4 is about ____________ cycles per second.
10.
The speak
er is dr
iv
en b
y
tr
ansistors ________ and ________.
Ans
w
er
s:
1) tw
o;
2) Q1, Q2;
3) Q3, Q4;
4) 5.4V
; 5) z
e
ro;
6) R2, R8;
7) 22:1;
8) oscillate;
9) 1,000;
10) Q4, Q5