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MARKET CENTRE Cash in your surplus gear. Advertise it here in SILICON CHIP KIT ASSEMBLY & REPAIR FOR SALE 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 guaranteed. $17 inspection fee plus charges for parts and labour as required. Labour fees $38 p/h. Pensioner discounts available on application. Contact Alan, VK2FALW on 0425 122 415 or email bigalradioshack<at>gmail. com RCA RIBBON MICROPHONE, 44-BX, ex ABC Good condition. $1500 o.n.o. 2x matching transformers. 2W / 200kW. Jorgan 0.32 no.251 Negotiable. Phone: 0408 335 241 AWST please! DAVE THOMPSON (the Serviceman from S ILICON C HIP) 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. Email dave<at>davethompson.co.nz KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith: 0409 662 794 keith.rippon<at>gmail.com PCB PRODUCTION 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 Advertising Index Altronics...............................79-82 Ampec Technologies............. OBC Dave Thompson...................... 111 Digi-Key Electronics.................... 3 LEDs, BRAND NAME and generic LEDs. Heatsinks, fans, LED drivers, power supplies, LED ribbon, kits, components, hardware, EL wire. www.ledsales.com.au ASSORTED BOOKS FOR $5 EACH Selling assorted books on electronics and other related subjects like audio, video, programming etc. Many of them are in poor condition. Some of the books may not be for sale, but the vast majority are available. Bulk discount available; post or pickup. All books can be viewed at: siliconchip.com.au/link/aawx Silicon Chip silicon<at>siliconchip.com.au Emona Instruments................. IBC Jaycar............................ IFC,53-60 Keith Rippon Kit Assembly...... 111 LD Electronics......................... 111 LEACH PCB Assembly............... 5 LEDsales................................. 111 Microchip Technology.................. 9 Ocean Controls......................... 21 RayMing PCB & Assembly........ 11 SC Micromite BackPack............ 65 MISCELLANEOUS LOOKING FOR: Set of Dick Smith Electronics catalogues from 1975-1982. Must be in pristine condition. Will pay $200 for the set (inc. postage), only one set needed. Contact Melanie (on behalf of inquirer on 02 8832 3100) Silicon Chip Shop...........106-107 Silicon Chip Subscriptions..... 103 The Loudspeaker Kit.com........... 7 Vintage Radio Repairs............ 111 Wagner Electronics................... 63 ADVERTISING IN MARKET CENTRE Classified Ad Rates: $32.00 for up to 20 words (punctuation not charged) plus $1.20 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. age regulation of the resulting device. Another, more conventional (and probably more sensible) method is to use a parallel transistor to boost the output current of a regulator. siliconchip.com.au For example, we did this in our High Power Linear Bench Supply project (October-December 2019; siliconchip. com.au/Series/339). You can even add multiple parallel transistors, as we did Australia’s electronics magazine in that case, which helps to distribute the heat and current even further. For more information, see the following website: www.bristolwatch. com/ccs/LM317boost.htm SC February 2020  111