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MARKET CENTRE Cash in your surplus gear. Advertise it here in SILICON CHIP WORLDWIDE ELECTRONIC COMPONENTS FOR SALE 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 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. www.iinet.net.au/~worcom 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 PCBs & Micros: SILICON CHIP can supply PCBs and programmed microcontrollers for recent projects and some not so recent projects: www.siliconchip. com.au or phone (02) 9939 3295. tronixlabs.com - Australia’s best value for hobbyist and enthusiast electronics from adafruit, DFRobot, Freetronics, Raspberry Pi, Seeedstudio and more, with same-day shipping. KIT ASSEMBLY & REPAIR PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191. sesame<at>sesame.com.au www.sesame.com.au 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 LEDs: BRAND NAME and generic LEDs. Heatsinks, fans, LED drivers, power supplies, LED ribbon, kits, components, hardware, tritium markers. We can order almost anything in! www. ledsales.com.au KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith 0409 662 794. keith.rippon<at>gmail.com VALVES (approx. 200): nearly all NOS triodes, suitable for audio and/or radio. Sell for half market value. List on request. robertd052<at>gmail.com VINTAGE RADIO REPAIRS: electrical mechanical fitter with 36 years ex­ perience and extensive knowledge of valve and transistor radios. Professional SiliconChipAddDark.ai 1 24/02/2015 3:37:39 PM C M Y CM MY CY Leaders in Essential Electronic Components Reduce Your Costs On Millions Of Parts 4000+ brands Free e Delivery Available Availa CMY K Safe . Secure . No Form Filling F www.x-on.com.au 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 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. ing them. The Jaycar kits have preassembled transformers and transducers. As instructed I adjusted the voltage to 5V prior to installing the fuse and IC2. Then when I apply power, the fuse blows. I’ve made all the usual siliconchip.com.au checks regarding soldering and shorts and it all looks OK. That said, one of the units does appear to work, ie, the power LED is on but I don’t hear any pulses over AM radio. Do you have any ideas please? (S. C., via email). •  If the transducer is placed on a flat hard surface, it tends to move when the frequency reaches resonance. That will give some indication that the transducer is being driven by the working unit. Do not touch the transducer terminals during this test, otherwise continued page 104 May 2015  103