Elenco Whooper Alarm User Manual

WHOOPER ALARM KIT

MODEL K-24

Instruction & Assembly Manual

Copyright © 2009, 1989 by Elenco

®

Electronics, Inc. All rights reserved. Revised 2009 REV-F 753224

No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

Elenco

®

Electronics, Inc.

Elenco

®

Electronics, Inc.

150 Carpenter Avenue

Wheeling, IL 60090

[phone]

Website: www.elenco.com

e-mail: [e-mail]

QUIZ

1. The Whooper Alarm has ___________ oscillators.

2. The low frequency oscillations are generated by transistors __________ and __________.

3. The high frequency oscillations are generated by transistors __________ and __________.

4. When the power is first turned on, the voltage at the base of Q2 is ___________.

5. When the power is first turned on, the voltage across C1 is ___________.

6. Capacitor C1 charges through resistor _______ and discharges through resistor __________.

7. The charge to discharged ratio on C1 is ___________.

8. Capacitor C3 causes transistor Q3 and Q4 to _____________.

9. The frequency of oscillation of Q3 and Q4 is about ____________ cycles per second.

10. The speaker is driven by transistors ________ and ________.

Answers: 1) two; 2) Q1, Q2; 3) Q3, Q4; 4) 5.4V; 5) zero; 6) R2, R8; 7) 22:1; 8) oscillate; 9) 1,000; 10) Q4, Q5

-6-

TROUBLESHOOTING

Consult your instructor or contact Elenco

®

Electronics if you have any problems. DO NOT contact your place of

purchase as they will not be able to help you.

1. One of the most frequently occurring problems is poor solder connections.

a) Tug slightly on all parts to make sure that they are indeed soldered.

b) All solder connections should be shiny. Resolder any that are not.

c) Solder should flow into a smooth puddle rather than a round ball. Resolder any connection that has

formed into a ball.

d) Have any solder bridges formed? A solder bridge may occur if you accidentally touch an adjacent foil

by using too much solder or by dragging the soldering iron across adjacent foils. Break the bridge with

your soldering iron.

COMPONENT CHECK

1. Be sure that all of the components have been mounted in their correct places.

2. Be sure that the electrolytic capacitors C1 and C4 have been installed correctly. These capacitors have

polarity, the negative and positive leads must be in the correct holes, as shown on the top legend of the PC

board.

3. Be sure that transistors Q1 - Q5 have been installed correctly. The flat side should be in the same direction

as shown on the top legend.

4. Use a fresh 9 volt battery.

5. Read the circuit operation lesson manual to familiarize yourself with the workings of the circuit.

SCHEMATIC DIAGRAM

PARTS LIST

If you are a student, and any parts are missing or damaged, please see instructor or bookstore.

If you purchased this Whooper Alarm Kit from a distributor, catalog, etc., please contact Elenco

®

Electronics

(address/phone/e-mail is at the back of this manual) for additional assistance, if needed. DO NOT contact your

place of purchase as they will not be able to help you.

RESISTORS

Qty. Symbol Description Color Code Part #

r 1 R8 100Ω 5% 1/4W brown-black-brown-gold 131000

r 2 R3, R6 1kΩ 5% 1/4W brown-black-red-gold 141000

r 1R2 2.2kΩ 5% 1/4W red-red-red-gold 142200

r 1R5 6.8kΩ 5% 1/4W blue-gray-red-gold 146800

r 2 R1, R9 15kΩ 5% 1/4W brown-green-orange-gold 151500

r 1 R4 22kΩ 5% 1/4W red-red-orange-gold 152200

r 1 R7 27kΩ 5% 1/4W red-violet-orange-gold 152700

CAPACITORS

Qty. Symbol Value Description Part #

r 2 C2, C3 .047μF (473) Discap 244780

r 2 C1, C4 100μF Electrolytic 281044

SEMICONDUCTORS

Qty. Symbol Value Description Part #

r 3 Q1, Q3, Q4 2N3904 Transistor 323904

r 1 Q2 2N3906 Transistor 323906

r 1 Q5 MPS6531 Transistor 326531

MISCELLANEOUS

-1-

Resistor Transistor

Capacitors

PARTS IDENTIFICATION

Discap

Electrolytic

Battery Snap

Speaker

Switch

BATTERIES

• Do not short circuit the battery terminals.

•

Never throw battery in a fire or attempt to open it.

• Use only 9V type (not included).

• Insert battery with correct polarity.

• Non-rechargeable batteries should not be

recharged.

• Remove battery when it is used up.

• Batteries are harmful if swallowed, so keep away

from small children.

Qty. Symbol Description Part #

r 1 PC Board 518000

r 1 S1 Switch Slide SPDT 541102

r 1 Solder Roll 24” 551124

Qty. Symbol Description Part #

r 1 B1 Battery Snap 9V 590098

r 1 SPK1 Speaker 8Ω 590102

r 2 Wire 4” Blue 814620