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MARKET CENTRE Cash in your surplus gear. Advertise it here in SILICON CSiliconChipAddDark.ai HIP FOR SALE 1 24/02/2015 3:37:39 PM WORLDWIDE ELECTRONIC COMPONENTS LEDs, BRAND NAME and generic LEDs. Heatsinks, fans, LED drivers, power supplies, LED ribbon, kits, components, hardware, EL wire. www. ledsales.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. MOVING SALE: bargains galore on our new website. We have to reduce our stock. Audio & video equipment, cables, components, mag’s, books, etc. www.questronix.com.au 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 After 30 years am closing down, so massive price reductions to clear stock. 1/4 Watt Resistors $0.55C per 100; 0.6W 1% Metal Film Resistors $1.10 perM 100; Batteries & PCB Products – Perth Metro or Pick Up Only. All other items 50% off CatalogueY Price. Minimum Purchase $11.00 + Freight. CM www.iinet.net.au/~worcom MY CY recent projects and some not so recent projects: www.siliconchip.com.au or phone (02) 9939 3295. Leaders in Essential Electronic Components Reduce Your Costs On Millions Of Parts 4000+ brands Free e Delivery Available Availa CMY K KIT ASSEMBLY & REPAIR DAVE THOMPSON (the Serviceman from SILICON CHIP) is available to help you with kit assembly, project troubleshooting, general electronics and custom design work. No job too small. Based in Christchurch, NZ but service available Australia/NZ wide. Phone NZ (+64 3) 366 6588 or email dave<at> davethompson.co.nz PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191. sesame<at>sesame.com.au www.sesame.com.au KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith 0409 662 794. keith.rippon<at>gmail.com PCBs & Micros: SILICON CHIP can supply PCBs and programmed microcontrollers and other specialist parts for VINTAGE RADIO REPAIRS: electrical mechanical fitter with 36 years ex­ perience and extensive knowledge of Safe . Secure . No Form Filling F www.x-on.com.au valve and transistor radios. Professional and reliable repairs. All workmanship 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 WANTED WANTED: EARLY HIFIs, AMPLIFIERS, Speakers, Turntables, Valves, Books, Quad, Leak, Pye, Lowther, Ortofon, SME, Western Electric, Altec, Marantz, McIntosh, Tannoy, Goodmans, Wharfe­ dale, radio and wireless. Collector/ Hobbyist will pay cash. (07) 5471 1062. johnmurt<at>highprofile.com.au 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. set were the DIP switches; they were all in the off position. I see that you have some parts that upgrade the controller if it suffers failures. Would my single-phase problems be in the PIC microcontroller’s program? (D. H., via email). •  We doubt the software was at fault. If there were still software problems, siliconchip.com.au other constructors would be having similar issues. We are assuming you were changing the EXT DIP switch setting when changing between the internal and external speed pots. We can only imagine that a hardware fault in one channel such as faulty soldering on the IGBT bridge or one of the SMD capacitors has caused strange behaviour and eventual failure. We can supply the up-rated IGBT bridge IC (30A/60A) and replacement shunt resistor for $40 + postage. Note though that you may also need to replace IC2 and possibly some of the optocouplers as these may have also continued page 96 June 2015  95