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MARKET CENTRE Cash in your surplus gear. Advertise it here in SILICON CHIP WORLDWIDE ELECTRONIC COMPONENTS FOR SALE PCB MANUFACTURE: single to multi­ layer. Bare board tested. One-offs to any quantity. 48 hour service. Artwork design. Excellent prices. Check out our specials: www.ldelectronics.com.au tronixlabs.com - Australia’s best value for hobbyist and enthusiast electronics from adafruit, DFRobot, Freetronics, Raspberry Pi, Seeedstudio and more, with same-day shipping. Audio + Video: Professional quality Quest AV brand equipment is made and sold in Australia exclusively by Quest Electronics. Ph 0431 920 667. sales<at>questronix.com.au PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191. sesame<at>sesame.com.au www.sesame.com.au LEDs: BRAND NAME and generic LEDs. Heatsinks, fans, LED drivers, power supplies, LED ribbon, kits, com- After 30 years am closing down, so massive price reductions to clear stock. 1/4 Watt Resistors $0.55 per 100; 0.6W 1% Metal Film Resistors $1.10 per 100; Batteries & PCB Products – Perth Metro or Pick Up Only. All other items 50% off Catalogue Price. Minimum Purchase $11.00 + Freight. KEEP YOUR COPIES OF SILICON CHIP AS GOOD AS THE DAY THEY WERE BORN! www.iinet.net.au/~worcom ponents, hardware, tritium markers. We can order almost anything in! www. ledsales.com.au ELECTRONIC GARAGE SALE on Internet, www.alojzy.webs.com Mobile: 0431 881 862. PCBs & Micros: SILICON CHIP can supply PCBs and programmed microcontrollers for all recent projects. Order from our Online Shop at www.siliconchip. com.au or phone (02) 9939 3295. KIT ASSEMBLY & REPAIR VINTAGE RADIO REPAIRS: electrical mechanical fitter with 36 years ex­ perience and extensive knowledge of valve and transistor radios. Professional and reliable repairs. All workmanship ONLY 95 $ 1P4LUS p&p A superb-looking SILICON CHIP binder will keep your magazines in pristine condition. * Holds up to 14 issues * Heavy duty vinyl * Easy wire inserts ORDER NOW AT www.siliconchip.com.au/shop guaranteed. $10 inspection fee plus charges for parts and labour as required. Labour fees $35 p/h. Pensioner discounts available on application. Contact Alan on 0425 122 415 or email bigal radioshack<at>gmail.com KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith 0409 662 794. keith.rippon<at>gmail.com ADVERTISING IN MARKET CENTRE Classified Ad Rates: $32.00 for up to 20 words plus 95 cents for each additional word. Display ads in Market Centre (minimum 2cm deep, maximum 10cm deep): $82.50 per column centimetre per insertion. All prices include GST. Closing date: 5 weeks prior to month of sale. To book, email the text to silicon<at>siliconchip.com.au and include your name, address & credit card details, or phone Glyn (02) 9939 3295 or 0431 792 293. WARNING! SILICON CHIP magazine regularly describes projects which employ a mains power supply or produce high voltage. All such projects should be considered dangerous or even lethal if not used safely. Readers are warned that high voltage wiring should be carried out according to the instructions in the articles. When working on these projects use extreme care to ensure that you do not accidentally come into contact with mains AC voltages or high voltage DC. If you are not confident about working with projects employing mains voltages or other high voltages, you are advised not to attempt work on them. Silicon Chip Publications Pty Ltd disclaims any liability for damages should anyone be killed or injured while working on a project or circuit described in any issue of SILICON CHIP magazine. Devices or circuits described in SILICON CHIP may be covered by patents. SILICON CHIP disclaims any liability for the infringement of such patents by the manufacturing or selling of any such equipment. SILICON CHIP also disclaims any liability for projects which are used in such a way as to infringe relevant government regulations and by-laws. Advertisers are warned that they are responsible for the content of all advertisements and that they must conform to the Competition & Consumer Act 2010 or as subsequently amended and to any governmental regulations which are applicable. siliconchip.com.au November 2014  103 Positions Vacant Retail Store Manager (Full Time) We presently seek a retail sales manager to lead our team in our new Virginia, Qld store. Do you have a passion for electronics and experience in retailing and managing teams? Do you wish to take your retail career to the next level? The successful candidate will have: Retail sales experience. A sound understanding of electronic components. Leadership ability. Excellent customer service skills. Strong communication. A high level of self-motivation. We offer a fun, challenging and dynamic work environment. You will be rewarded with a base salary with bonus incentives based on sales performance. If you meet the above criteria and wish to apply for this opportunity please send your application and attach your resume in confidence to: Daniel.neuss<at>altronics.com.au • • • • • • Advertising Index 4D Systems Pty Ltd...................... 11 Altronics.........................loose insert Clarke & Severn Electronics.......... 9 Electric Factory Pty Ltd................ 23 Emona Instruments...................... 39 Hammond Manufacturing............... 9 Hare & Forbes............................. 2-3 Icom Australia.............................. 13 Jaycar .............................. IFC,49-56 Keith Rippon .............................. 103 KitStop.......................................... 12 Retail Sales – Full Time and Casual (2) LD Electronics............................ 103 We presently seek retail sales people to join the team in our new Virginia, Qld store. Do you have a passion for electronics and experience in retail? Are you a people person with a love of technology? The successful candidates will have: Retail sales experience. An understanding of electronics. Excellent customer service skills. We offer a fun, challenging and dynamic work environment. You will be rewarded with a base salary with bonus incentives based on sales performance. If you meet the above criteria and wish to apply for this opportunity please send your application and attach your resume in confidence to: Daniel.neuss<at>altronics.com.au LEDsales.................................... 103 • • • Lintek Pty Ltd............................... 27 Master Instruments................. OBC‑ Microchip Technology................... 15 Mikroelektronika......................... IBC Ocean Controls............................ 75 QualiEco Circuits Pty Ltd............. 59 Internal Wholesale Sales Representative – Loganholme Quest Electronics....................... 103 We require the services of a bright and enthusiastic and outgoing team player to join our friendly wholesale sales team. Duties include: Phone sales. External sales rep support. Customer service enquiries. Counter sales. The ability to multi-task and work unsupervised is essential. We seek a person preferably with industry experience and an interest in electronic theory and audio visual systems. We offer a fun, challenging and dynamic work environment. You will be rewarded with a base salary with bonus incentives based on sales performance. If you meet the above criteria and wish to apply for this opportunity please send your application and attach your resume in confidence to: Daniel.neuss<at>altronics.com.au Radio, TV & Hobbies DVD....... 12,25 • • • • Rohde & Schwarz.......................... 5 Sesame Electronics................... 103 Silicon Chip Binders................... 103 Silicon Chip Online Shop........ 90-91 Silicon Chip PCBs...................... 103 Silicon Chip Subscriptions........... 65 Silvertone Electronics.................. 35 Tronixlabs................................... 103 Ask SILICON CHIP . . . continued from page 102 You could also speed up discharge of the supply capacitor by connecting a 1kΩ resistor across the supply on the cathode (K) side of diode D3 to 0V (GND), or directly across the capacitor. Threshold voltage switch for fridge I built the Threshold Voltage Switch (SILICON CHIP, July 2014) and enjoyed building it. I have a solar panel on my van’s roof, running an Engel fridge 104  Silicon Chip inside with an Allrounder 120Ah battery. The voltage varies quite a lot between day and night as it is hooked up to run permanently. The fuse to run this fridge on DC is gold-plated as they want A$50 to replace it. I wonder if it would be possible to use your design without a lot of modifications to switch the power to the fridge off when a preset voltage of say 11.7V DC occurs? This would save me replacing the fuse as the fridge cost is $A1000 in the first place. (P. M, Rochedale South, Qld). • The Threshold Voltage Switch can Wiltronics........................................ 7 Worldwide Elect. Components... 103 be set to switch the relay at 11.7V. For a refrigerator, you would need a relay that can switch the necessary motor current. It seems some Engel fridges draw up to 4.2A but the peak current could be a lot higher. The 30A relays mentioned on page 32 of the July 2014 article should be suitable. Whether the Threshold Voltage switch switches the relay on or off is dependent on LK3’s position. VR3 adjusts the switching threshold. SC siliconchip.com.au