Silicon ChipMarket Centre - February 1991 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Extolling the virtues of fluorescent lights
  4. Feature: Electric Vehicles; Pt.2 by Gerry Nolan
  5. Feature: A Practical Approach To Amplifier Design by David Eather
  6. Project: A Synthesised Stereo AM Tuner, Pt.1 by John Clarke & Greg Swain
  7. Feature: Computer Bits by Jennifer Bonnitcha
  8. Vintage Radio: One thing leads to another by John Hill
  9. Project: Three Inverters For Fluorescent Lights by Otto Priboj
  10. Project: Build A Low-Cost Sinewave Oscillator by Darren Yates
  11. Back Issues
  12. Project: Fast Charger For Nicad Batteries; Pt.2 by John Clarke & Greg Swain
  13. Serviceman's Log: Now look what ya gorn an' done! by The TV Serviceman
  14. Feature: Remote Control by Bob Young
  15. Feature: Amateur Radio by Garry Cratt, VK2YBX
  16. Feature: The Story Of Electrical Energy; Pt.8 by Bryan Maher
  17. Order Form
  18. Market Centre
  19. Advertising Index
  20. Outer Back Cover

This is only a preview of the February 1991 issue of Silicon Chip.

You can view 47 of the 104 pages in the full issue, including the advertisments.

For full access, purchase the issue for $10.00 or subscribe for access to the latest issues.

Articles in this series:
  • Electric Vehicles: The State Of The Art (January 1991)
  • Electric Vehicles; Pt.2 (February 1991)
  • Electric Vehicles; Pt.3 (March 1991)
  • The World Solar Challenge (April 1991)
  • Motors For Electric Vehicles (May 1991)
  • Electric Vehicle Transmission Options (June 1991)
Articles in this series:
  • A Practical Approach To Amplifier Design (February 1991)
  • A Practical Approach To Amplifier Design; Pt.2 (April 1991)
Articles in this series:
  • A Synthesised Stereo AM Tuner, Pt.1 (February 1991)
  • A Synthesised Stereo AM Tuner, Pt.2 (March 1991)
  • A Synthesised Stereo AM Tuner, Pt.3 (April 1991)
Articles in this series:
  • Computer Bits (July 1989)
  • Computer Bits (August 1989)
  • Computer Bits (September 1989)
  • Computer Bits (October 1989)
  • Computer Bits (November 1989)
  • Computer Bits (January 1990)
  • Computer Bits (April 1990)
  • Computer Bits (October 1990)
  • Computer Bits (November 1990)
  • Computer Bits (December 1990)
  • Computer Bits (January 1991)
  • Computer Bits (February 1991)
  • Computer Bits (March 1991)
  • Computer Bits (April 1991)
  • Computer Bits (May 1991)
  • Computer Bits (June 1991)
  • Computer Bits (July 1991)
  • Computer Bits (August 1991)
  • Computer Bits (September 1991)
  • Computer Bits (October 1991)
  • Computer Bits (November 1991)
  • Computer Bits (December 1991)
  • Computer Bits (January 1992)
  • Computer Bits (February 1992)
  • Computer Bits (March 1992)
  • Computer Bits (May 1992)
  • Computer Bits (June 1992)
  • Computer Bits (July 1992)
  • Computer Bits (September 1992)
  • Computer Bits (October 1992)
  • Computer Bits (November 1992)
  • Computer Bits (December 1992)
  • Computer Bits (February 1993)
  • Computer Bits (April 1993)
  • Computer Bits (May 1993)
  • Computer Bits (June 1993)
  • Computer Bits (October 1993)
  • Computer Bits (March 1994)
  • Computer Bits (May 1994)
  • Computer Bits (June 1994)
  • Computer Bits (July 1994)
  • Computer Bits (October 1994)
  • Computer Bits (November 1994)
  • Computer Bits (December 1994)
  • Computer Bits (January 1995)
  • Computer Bits (February 1995)
  • Computer Bits (March 1995)
  • Computer Bits (April 1995)
  • CMOS Memory Settings - What To Do When The Battery Goes Flat (May 1995)
  • Computer Bits (July 1995)
  • Computer Bits (September 1995)
  • Computer Bits: Connecting To The Internet With WIndows 95 (October 1995)
  • Computer Bits (December 1995)
  • Computer Bits (January 1996)
  • Computer Bits (February 1996)
  • Computer Bits (March 1996)
  • Computer Bits (May 1996)
  • Computer Bits (June 1996)
  • Computer Bits (July 1996)
  • Computer Bits (August 1996)
  • Computer Bits (January 1997)
  • Computer Bits (April 1997)
  • Windows 95: The Hardware That's Required (May 1997)
  • Turning Up Your Hard Disc Drive (June 1997)
  • Computer Bits (July 1997)
  • Computer Bits: The Ins & Outs Of Sound Cards (August 1997)
  • Computer Bits (September 1997)
  • Computer Bits (October 1997)
  • Computer Bits (November 1997)
  • Computer Bits (April 1998)
  • Computer Bits (June 1998)
  • Computer Bits (July 1998)
  • Computer Bits (November 1998)
  • Computer Bits (December 1998)
  • Control Your World Using Linux (July 2011)
Articles in this series:
  • Fast Charger For Nicad Batteries; Pt.1 (January 1991)
  • Fast Charger For Nicad Batteries; Pt.2 (February 1991)
Articles in this series:
  • Remote Control (February 1991)
  • Remote Control (March 1991)
Articles in this series:
  • Amateur Radio (November 1987)
  • Amateur Radio (December 1987)
  • Amateur Radio (February 1988)
  • Amateur Radio (March 1988)
  • Amateur Radio (April 1988)
  • Amateur Radio (May 1988)
  • Amateur Radio (June 1988)
  • Amateur Radio (July 1988)
  • Amateur Radio (August 1988)
  • Amateur Radio (September 1988)
  • Amateur Radio (October 1988)
  • Amateur Radio (November 1988)
  • Amateur Radio (December 1988)
  • Amateur Radio (January 1989)
  • Amateur Radio (April 1989)
  • Amateur Radio (May 1989)
  • Amateur Radio (June 1989)
  • Amateur Radio (July 1989)
  • Amateur Radio (August 1989)
  • Amateur Radio (September 1989)
  • Amateur Radio (October 1989)
  • Amateur Radio (November 1989)
  • Amateur Radio (December 1989)
  • Amateur Radio (February 1990)
  • Amateur Radio (March 1990)
  • Amateur Radio (April 1990)
  • Amateur Radio (May 1990)
  • Amateur Radio (June 1990)
  • Amateur Radio (July 1990)
  • The "Tube" vs. The Microchip (August 1990)
  • Amateur Radio (September 1990)
  • Amateur Radio (October 1990)
  • Amateur Radio (November 1990)
  • Amateur Radio (December 1990)
  • Amateur Radio (January 1991)
  • Amateur Radio (February 1991)
  • Amateur Radio (March 1991)
  • Amateur Radio (April 1991)
  • Amateur Radio (May 1991)
  • Amateur Radio (June 1991)
  • Amateur Radio (July 1991)
  • Amateur Radio (August 1991)
  • Amateur Radio (September 1991)
  • Amateur Radio (October 1991)
  • Amateur Radio (November 1991)
  • Amateur Radio (January 1992)
  • Amateur Radio (February 1992)
  • Amateur Radio (March 1992)
  • Amateur Radio (July 1992)
  • Amateur Radio (August 1992)
  • Amateur Radio (September 1992)
  • Amateur Radio (October 1992)
  • Amateur Radio (November 1992)
  • Amateur Radio (January 1993)
  • Amateur Radio (March 1993)
  • Amateur Radio (May 1993)
  • Amateur Radio (June 1993)
  • Amateur Radio (July 1993)
  • Amateur Radio (August 1993)
  • Amateur Radio (September 1993)
  • Amateur Radio (October 1993)
  • Amateur Radio (December 1993)
  • Amateur Radio (February 1994)
  • Amateur Radio (March 1994)
  • Amateur Radio (May 1994)
  • Amateur Radio (June 1994)
  • Amateur Radio (September 1994)
  • Amateur Radio (December 1994)
  • Amateur Radio (January 1995)
  • CB Radio Can Now Transmit Data (March 2001)
  • What's On Offer In "Walkie Talkies" (March 2001)
  • Stressless Wireless (October 2004)
  • “Degen” Synthesised HF Communications Receiver (January 2007)
  • WiNRADiO: Marrying A Radio Receiver To A PC (January 2007)
  • PICAXE-08M 433MHz Data Transceiver (October 2008)
  • Half-Duplex With HopeRF’s HM-TR UHF Transceivers (April 2009)
  • Dorji 433MHz Wireless Data Modules (January 2012)
Articles in this series:
  • The Technology Letters, Pt.2 (January 1989)
  • The Story Of Electrical Energy (July 1990)
  • The Story Of Electrical Energy; Pt.2 (August 1990)
  • The Story Of Electrical Energy; Pt.3 (September 1990)
  • The Story Of Electrical Energy; Pt.4 (October 1990)
  • The Story Of Electrical Energy; Pt.5 (November 1990)
  • The Story Of Electrical Energy; Pt.6 (December 1990)
  • The Story Of Electrical Energy; Pt.7 (January 1991)
  • The Story Of Electrical Energy; Pt.8 (February 1991)
  • The Story Of Electrical Energy; Pt.9 (March 1991)
  • The Story Of Electrical Energy; Pt.10 (May 1991)
  • The Story Of Electrical Energy; Pt.11 (July 1991)
  • The Story Of Electrical Energy; Pt.12 (August 1991)
  • The Story Of Electrical Energy; Pt.13 (September 1991)
  • The Story Of Electrical Energy; Pt.14 (October 1991)
  • The Story Of Electrical Energy; Pt.15 (November 1991)
  • The Story Of Electrical Energy; Pt.16 (December 1991)
  • The Story Of Electrical Energy; Pt.17 (January 1992)
  • The Story Of Electrical Energy; Pt.18 (March 1992)
  • The Story Of Electrical Energy; Pt.19 (August 1992)
  • The Story of Electrical Energy; Pt.20 (September 1992)
  • The Story Of Electrical Energy; Pt.21 (November 1992)
  • The Story Of Electrical Energy; Pt.22 (January 1993)
  • The Story of Electrical Energy (April 1993)
  • The Story Of Electrical Energy; Pt.24 (May 1993)
  • The Story Of Electrical Energy; Pt.24 (June 1993)
MARKET CENTRE Cash in your surplus gear. Advertise it here in Silicon Chip. r-------------------------7 I I I I I I I I I I FOR SALE CLASSIFIED ADVERTISING RATES WEATHER FAX programs for IBM XT/ ATs *** "RADFAX2" is a high resolution, shortwave weather fax, Morse & RTTY receiving program . Needs CGA, SSB HF radio & Radfax decoder. Also "RF2HERC", "RF2EGA" & "RF2VGA", same as RADFAX2 but suitable for Hercules, EGA & VGA cards respectively. $35. *** "SATFAX" is a NOAA, Meteor & GMS weather satellite picture receiving program. Uses EGA & VGA modes, needs EGA or VGA colour monitor & card, plus "WEATHER FAX" PC card . $45 . *** All programs are on 5.25-inch or 3.5-inch discs (state which) & include documentation . Add $3 postage. ONLY from M. Delahunty, 42 Villiers St, New Farm, 4005 Old. Phone (07) 358 2785 . Advertising rates for this page : Classified ads - $7.00 for up to 15 words plus 40 cents for each additional word. Display ads (casual rate) - $20 per column centimetre (Max. 10cm). Closing date: five weeks prior to month of sale. If you use a PO Box number, you must include your permanent address and phone number for our files. We cannot accept ads submitted without this information. To run your classified ad, print clearly on the lines below or on a separate sheet of paper & send the form together with your cheque or credit card details to : Silicon Chip Classifieds, PO Box 139, Collaroy Beach , NSW 2097. Or fax the details to (02) 979 6503. BWD OSCILLOSCOPE, 35MHz Dual Trace , Model 830. As brand new. Paid $1600, sell for $900 (no offers) . Contact Claude on (086) 28 2435 anytime . MY AUSTRALIAN DESIGNED lowcost super-fast Z80 micro-controller development system has gained acceptance already with educational institutions. Pop it on the end of any PC MS DOS or Z80 machine and away you go. Boards, EPROM and 360K disc $76 including postage for a short form kit. Gee, I wish I had this when I was a IIT MATHS COPROCESSORS Enclosed is my cheque/money order for $_ _ _ _ or please debit my 0 Bankcard O Visa Card O Master Card Card No. Signature_ _ __ _ __ _ _ _ _ Card expiry date___/_ __ Name _ _ _ _ _ _ __ _ _ _ _ _ _ _ __ _ _ __ _ __ Street _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ __ Suburb/town _ _ __ _ _ _ _ _ _ _ _ Postcode_ _ _ _ __ X I I I I I I I I I I L------ ------------------~ 102 SILICON CHIP 2C-08 2C-10 2C-12 2C-20 2C87- 8MHZ 2C87-10MHZ 2C87-12MHZ 2C87-20MHZ """'&r. ~,s> ""o $330 $359 $430 $490 ~< ~<S'.s, $640 3C-1_6 3C87-16MHZ 3C-20 3C87-20MHZ $680 3C-25 3C87-25MHZ $840 3C-33 3C87-33MHZ $990 These pices include Sales Tax. Stocks are limited at this price, so order early. FIVE YEAR WARRANTY CAD CONNECTION PHONE (02)957 6719 FAX (02)954 5550 CONNECTION CAD MEMORY EXPANSION SIMM & SIP 9 x 256 9 x 4MB ·120ns ·100ns · 80ns · ?Ons · 60ns -100ns · sons · ?Ons · sons · ?Ons • sons N/A 23.00 23 .80 24.70 30.00 79.00 81.50 89.50 76 .50 82.00 528.00 DRAM/DIP 4164 41256 41464 4 x 256 1MB -100ns · sons · 80ns · sons • sons 2. 10 2.40 2.50 7.65 7.65 9 x 1MB 8 x 1MB(MAC) Prices At Sept. 13, 1990 CO-PROCESSORS INTEL 8087-2 80287-10 80C287-1 2 387SX· 16 387DX-16 387SX-20 387DX·20 387DX-25 387DX·33 175.00 308.00 390.00 435.00 478 .00 490.00 538.00 680.00 835.00 CYRIX 400.00 490.00 750.00 387SX-16 387DX·20 3870X-33 TOSHIBA LAPTOP TIOOOSE T1600 T3100E T3100SX T3200SX T3200 T5100 T5200 2MB 515 .00 2MB 340.00 2MB 340.00 2MB 340.00 2MB 340.00 3MB 570.00 2MB 340.00 2MB 340.00 COMPAQ 386-20. 386-25. 386·20E , 386-S, 386-33 4MB MOD ULES 680.00 4MB BOArds 798.00 TOROID POWER TRANSFORMERS From quality UK manufacturers. Available from stock at discount prices, 15VA to 625VA. Send SSAE for data & prices to: Transformer Discounters, PO Box 542, Wahroonga 2076. IBM PS/2 PELHAM WEITEK 3167-20 3167-33 4167-25 4167-33 820.00 1010.00 1500.00 1780.00 30/286.50 70E61 ,121 70A21 2MB 2MB 2MB 250.00 280.00 280.00 Sales Tax 20%. Overnight Delivery. Credit Cards Welcome 1st Floor, 100 Yarrara Road , Pennant Hills , NSW 2120. Tel (02) 980 6988 Fax (02) 980 6991 MAX 1/0 Board Kit $169.00 Buitl & Tested $269.00 • • • • • • 7 x Relays SPST 2 amps each 8 x Switch inputs (TTL) 1 x DAG (Digital to Analog converter) 1 x ADC ( Analog to Digital converter) 4 x Motor Drive outputs (40mA ea.) 1 x Programmable timer output. MAX includes a 20 page manual with all schematics, parts layout etc., a 360K PC compatible floppy with diagnostic and sample software in GW-Basic. MAX runs from a PC compatible Printer pert for full compatibility with a large range of computers. Same day dispatch of orders. Credit cards or personal cheque welcome. Phone: (08) 332 6513 or Fax: (08) 364 0902 (24 hours) ELECTRONIC TOY SERVICES, PO BOX 491, NOARLUNGA CENTRE, SA 5168. Phone: (08) 382 8919 LOOP ANTENNA Improve signal strength & quality with this portable antenna. Kit $44.00. Built and Tested S69 00 COMPACT INDOOR FM ANTENNAS Two models to choose from, Terk FM2000 a passive loop FM antenna for $69 .95 or the Terk Pl2 powered FM antenna with wideband low noise filter for S199.00. KIT REPAIRS We can also provide assembly facilities for small production runs at competitive prices Kits repaired from all magazines. PCs and peripherals also repaired Ring anytime 9am - 9pm JILOA (TECHNIKIT DIVISION) EEM ELECTRONICS LEARN WITH UCANDO TRAINING COMPUTER ANIMATED VIDEOS 10 Bouverie Place Epping Vic. 3076 (03) 401 1393 PC Computers 36 Regent St,Kensington, SA, MODEL TRAIN CONTROLLER project Silicon Chip November 1990, $19.95 plus $2.50 p&p. Plugpack, 12VAC, 1.7A, suitable for the above (use rectifier), $29.95 plus $4.00 p&p. Kits built & repaired. Prototype production board supplier to the hobbyist & supplier of SILICON CHIP project PCBs. ACTIVE SHORTWAVE ANTENNA SILICON CHIP, JAN 1990. Complete kit S59 00, Built and Tested $119.00, Case $10.00. FIX-A-KIT $20.00 PER HOUR LABOUR 3 MONTHS WARRANTY ON REPAIRS 12 MONTHS WARRANTY ON CONSTRUCTION Service to most types of electronic equipment TECHNICAL ASSISTANCE HVCAL INSTRUMENTS Design. Manufacture & Repair of Electronic Equipment Trading Hours 8am to 3pm, Monday to Friday (02) 633 5897 PO Box 73, Glenhuntly, VIC 3163. Telephone: (03) 571 6303 VT201 53 Mins DC Circuits VT202 71 Mins AC Circuits VT203 54 Mins VCR Maint. VT204110 Mins VCR Repair VT205 47 Mins Semiconductors VT206 55 Mins Power Supplies VT207 54 Mins Amplifiers $75.42 $79.54 $75.42 $114.97 $75.42 $75 .42 $75.42 Mastercard/Visa/NZ Cheque to : Electronics Assembly Company PO Box 21191, Christchurch, New Zealand. Phone (03) 79 5570 Price includes postage & packing. kid. For more information, send a 43c stamp to: Don McKenzie, 29 Ellesmere Crescent, Tullamarine 3043. CREATE YOUR OWN DIGITAL WAVEFORMS FOR SALE: 5mW LASER. Fully built power supply. $350. (02) 728 4768. As described in SILICON CHIP in March 1990, May 1990 & June 1990. The software can also be used for the similar project (Simple PC Function Generator) described in Electronics Australia in January 1989. ANTIQUE RADIO Software & PC Board: $39.95 incl. p&p. Software only: $32.50 incl. p&p. Money Order or Cheque. Guaranteed delivery within 14 days. ANTIQUE RADIO restorations. Your one-stop electronic repair shop. Specialising in restoring vintage radios including chassis rewiring, quality new parts, valves, valve sockets, speakers, transformers, cabinet restoration. Quality secondhand radio dials & parts for most brands & models. About 400 radios in stock for restoration & parts. M. Radvanyi, PO Box 49, Kingswood, NSW 2749. Every restored wireless is covered by a 2-year warranty on parts & service. French polishing of timber cabinets available. Vintage car radios in valve & transistor types available for restora- tion. Repairs done on tape decks, amplifiers, TVs & videos. Open Sat. 10am-5pm; Sun. 12.30-Spm. 109 Cann St, Bass Hill, NSW 2197. Phone (02) 645 3173 BH or (02) 7261613AH. SC FEBRUARY1991 103 ASK SILICON CHIP - CTD FROM PAGE 101 Advertising Index Altronics .............................. 52-53 ing Feedback with Equalisation", p106, August 1990). I have decided to take your advice on frequency shifting the whole signal slightly with a "Howl Round Stabiliser", though the pitch shifting chips (MC1495) are rather hard to find. (S. P., Melville, WA). • We have not considered doing an expander although the circuit is not much different from that of the compressor. We'll put it on the list of projects for 1991. How about that? The Motorola MC1495 should be available from VSI Electronics (Australia) Pty Ltd in Perth. Try them on (09) 328 8499. Volume control needs better matching I have built two Studio 200 Stereo Control Units, as described in the June and July 1988 issues of SILICON CHIP. Both work well but they both have the same problem. When I want to listen at very low levels, when the rest of my family is asleep, I find that one channel is louder than the other. Is there a design fault in the circuit or is there a modification I can make to improve the problem? (M. K., Stanmore, NSW). • What you are experiencing is not a design fault but the normal lack of matching between sections of the volume control when it is set at very low levels. Just about all controls on stereo amplifiers have the same problem unless a higher cost, specially matched vo lume control has been install ed. Japanese firms such as Alps do manufacture closely matched dual ganged volume controls but they.are not cheap or readily available. It might also be possible to purchase such a volume control as a replacement part for a Japanese amplifier. One other way around the problem would be to put in an extra switch to reduce the gain for low level listening, similar to a Mute switch. That way, you could listen at low levels but have the volume contro l set to say, 9 or 10 o' clock, where the control matching is reasonable. This could be achieved by switching a 22kQ resistor in series with each section of the Balance control. Another way could be to wire one pair of the Source inputs for lower gain. If you listen to CD most of the time, connect a 120kQ resistor from the CD input to the Aux 2 input, in each channel. Then when you select Aux 2, you can listen to CDs with a higher setting on the volume control. Arista ......................... ..... 17,74,97 Back Issues .. .. ....... .......... ..... 58,59 Boston Technology . ... . .. ... .. ... ... 89 Cad Connection ... ... .. ... .. ... .... 102 Christian Blind Mission ............ 97 David Reid Electronics ........ IFC ,1 Dick Smith Electronics ........... . 5-7 EEM Electronics .. ... ... .. ... ... .... 103 Electronic Solutions ............ 25,81 Electronic Toy Services .......... 103 Electronics World ......... ... ... ..... 75 Elmeasco . ... .. ... .... ... .. .. ... ... .... .. 27 Geoff Wood Electronics . .... ... .. 13 Harbuch Electronics .. .............. 38 Hycal Instruments ...... ... ..... ... . 103 Jaycar Electronics ..... ........... 33-36 69-72 Jiloa ............. ........... .... ............ 103 J.V. Tuners .... .. ... ....... .............. 79 M. Radvanyi ...... .... .... ..... ....... 103 Oatley Electronics ...... ..... ......... 51 PC Computers . .... ... ... .... .. .. ... 103 PC Marketplace ... ...... .... ... .... IBC Pelham ............... .. ........ .. ....... 103 RCS Radio .. .. ... .... ... .. ... ... ... ... .. 75 Resurrection Radio .. .. .... .. ... ... .. 41 Rod Irving Electronics ....... ... 44,45 60,61,90,91 Sheridan Electronics .... .. ... .. .. .. . 19 x r-------------------------, Silicon Chip Binders ...... ........ OBC SILICON CHIP BINDERS Subscriptions . .. .... ... ... ... ... .. .. . .. 99 To: Silicon Chip Publications, PO Box 139, Collaroy Beach, NSW 2097, Australia. Yes! Please send me _ _ _ SILICON CHIP binder(s) at $A11 .95 plus $A3 p&p each (NZ $A6 p&p). Enclosed is my cheque/money order for $_ _ _ _ _ or please debit my O Bankcard O Visa Card 0 Master Card Card No . Signature_ _ _ _ _ _ _ __ _ _ _ Card expiry date_ _ _,/_ _ _ Name _ _ __ _ _ _ _ __ _ _ _ _ _ _ __ _ __ _ _ __ Street _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ __ __ _ _ __ _ Suburb/town _ _ _ _ _ _ __ _ _ _ _ Postcode_ _ __ _ __ L _________________________ J 104 SILICON CHIP Sound Australia .. ... ... ... ... ... .. .. . .. 17 Transformer Discounters ...... 103 PC Boards Printed circuit boards for SILICON CHIP projects are made by: • Electronic Toy Services, 2/111 Glynville Drive, Hackham West, SA 5163. Phone (08) 382 8919. • Jemal Products , 5 Forge St, Welshpool, WA 6106. Phone (09) 350 5555. • Marday Services, PO Box 19-189, Avondale, Auckland, NZ. Phone 88 5730. • RCS Radio Pty Ltd, 651 Forest Rd, Bexley, NSW 2207. Phone (02) 587 3491.