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very strong electrical junction box such as the one shown. Assemble all the nec-essary parts into the chosen box as illus* trated in our diagram. To test the unit connect power to the unit, switch the key to the on position and remove the power by operating the “Test” push button. After a few seconds the siren should operate and it should continue to do so even if the test push button is released. Switch the key to the off, position and check that the siren stops operating. Of course we are assuming the batteries were fully charged to start with, if this isn*t the case, you’ll need to connect the unit to a 12V power supply or battery for a while before testing it.®

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PARTS LIST

1 PCB. codę 87ms9 1 Plastic box 50x90x150mm 1 1 Piezo siren (12V — 150mA) 1 AA 4 celi battery holder 4 AA nicad batteries 1 Pushbutton switch (normally closed)

1 Barrel key switch 1 Battery snap connector Screws, nuts. washers, hook-up wire

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bass is the price

you have to pay    ^r

- but no longer!

A passive stereo subwoofer is now available which you simply connect to your amplifier and the sidespeakers to the output terminals on the subwoofer. Will match any speakers with an efficiency of 85 to 88dB, and will add true deep bass to any smali

^ |    ThisScan

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^ (one for each channel). Power handling 100 RMS. Freouency response 25-88 Hz. Priced at under S600, this is a great way to add an extra octave or two you‘ve never heard before. For fuli information and your nearest stockist. contact;

SCAN AUDIO Pty. Ltd.,

52 Crown Street. Richmond. Victoria 3121.

Telephone: [phone].

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1 BC549 Si NPN transistor 1 BC559 Si PNP transistor

3    BC337 Si NPN transistors 1 BD139 Si NPN transistor

1 AD161 Ge NPN transistor 1 AD 162 Ge PNP transistor 1 74C14 or 74HC14 integrated CCT (Hex Schmitt trigger)

6 1N4148 Si diodes

4    1N4001 Si diodes

1    5.6V 400mW zener diodę

Capacitors

4 0.01 uF ceramics or greencaps 4 100uF, 16V electrolytics

2    100uF. 16V bipolar electrolytics

Resistors - 0.25 W 5%

2 x 22H. 4 X 100n. 1 X 4700, 3 x 1kO, 6 x 2.2kO. 2 x 10kO. 1 x 33kO. 2 x 47kO. 1 x 100kO

Where to buy parts: a kit of parts for this project is available from Oatley Electronics, 5 Lansdowne Pde (PO Box 89) Oatley, NSW 2223. Telephone: [phone]. PCB kit only (with components) — $17.00

Piezo siren — $16.00 Barrel key switch — $6.50 NiCad batteries — $3.00 each Complete kit — $55.00 (add $2.00 for P&P)

JpŁ SCHEMA II: Schematic ^~= Capture Software for OMATIOM Engineering Professionals

FREE DEM ONSTRATION PACK! New Release Version 2.01

Speed ease of use and power madę SCHEMA the schematic software package for thousands of engineering professionals the world over. Now. SCHEMA II sets a new standard for all schematic capture programs to fołlow, regardless of price.

Use SCHEMA II to draw schematics (and other technical drawmgs) and automaticaJly generate related design documentation such as bills of materials. net/pin/wire Ifsts. component usage reports. design rule error checking reports. and morę. SCHEAAAII can help tum a good design into a great product because consistent design information is accurately transferred through the entire design cyde.

SCHEMA II runs on IBM PC/ttr/AT/386/compatible personal computers and supports most popular graphics adapters. printers. plotters and mouses

SCHEMA II is produced by Omabon Inc of Richardson Texas U S A Abram Computers are tne Sole Australian distributors SCHEAAA II is S985 Plus $10.00 freight plus tax if applicable.

Your satisfaction is Cuaranteed ... or your Money Back.

Abram Computers guarantee your satisfaction with SCHEAAA II. Try it for 30 days. If for any reason, you feel SCHEAAA II does not meet your needs, return the package for a fuli refund.

cJ&lbram

Oomputers

[phone]

Suitę 19. 2 0'Connell Street,

ParramatU NSW 2150.

ELECTRONICS Australia. September 1987