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Next Month in Silicon Chip Silicon Chip’s 30th Anniversary Advertising Index Altronics................................ FLYER Silicon Chip was first published in November 1987, meaning that the November 2017 issue will be published on our 30th anniversary. The article explaining how to make the best use of our website, mentioned in this column last month, will appear in that issue (it was held over from this issue due to space constraints). Dave Thompson......................... 103 Stylish new Dipole Hifi Loudspeakers Hare & Forbes.............................. 35 Digi-Key Electronics....................... 3 Emona Instruments.................... IBC We showed a photo of this new loudspeaker, designed by Allan Linton-Smith, in the September issue and you’ll agree that it looks fantastic. Commercial dipole speakers can be frightfully expensive (up to $30,000+ a pair!) but ours can be built for a tiny fraction of that. We’ve also managed to overcome the bugbear of dipole loudspeakers, which is poor bass response. These are flat to 20Hz! High Profile Communications..... 103 nRF24L01+ 2.4GHz Wireless Data Transceiver Modules LEDsales.................................... 103 Jim Rowe describes the operation of these 2Mbps digital radio modules with software that lets you communicate with a pair of Arduino or Micromite modules. New AM radio receiver to build AM Radio still has a lot of advantages and here’s an AM Radio receiver that you’ll have a lot of fun building, you’ll learn a lot about the how, when, where and why of AM radio – and end up with a radio that works well and looks great on your bedside table, shelf... anywhere! No hard-to-solder bits, either: it’s all discrete components and is all built on one PCB – tuning dial and loudspeaker included. Note: these features are prepared or are in preparation for publication and barring unforeseen circumstances, will be in the next issue. The November 2017 issue is due on sale in newsagents by Thursday, October 26th. Expect postal delivery of subscription copies in Australia between October 26th and November 14th. Jaycar............................... IFC,49-56 Keith Rippon Kit Assembly......... 103 LD Electronics............................ 103 Master Instruments.................... 103 Microchip Technology............... OBC Mouser Electronics......................... 7 Ocean Controls.............................. 9 Sesame Electronics................... 103 SC Online Shop................. 75,94-95 SC Radio, TV & Hobbies DVD...... 85 Silicon Chip Subscriptions.......... 87 Silicon Chip Wallchart................. 57 Tronixlabs................................... 103 Vintage Radio Repairs............... 103 Notes & Errata Automatic NBN/ADSL Router Rebooter, September 2017: as depicted in the circuit on page 36, the relay is SC incorrectly shown with the normally-open contacts in series with the router. The circuit should be changed to show the normally-closed contacts in series with the router. That will mean that when the relay is enabled, the power to the router will be interrupted. Power Supply for Battery-Operated Valve Radios, August 2017: the case specified in the text is too large. It should be PacTec LH55-130. The short link has been updated to go to the correct Mouser catalog item (616-71886-510-000). Also, note that if you use the B battery sockets on the rear panel you need to make sure they are not swapped or the power supply will be shorted out. Vintage Radio (DKE38), July 2017: in the middle column of page 94, the article states that “The amplified signal is developed across the 2MW resistor R3...”. This is incorrect. R3 is a feedback resistor from the loudspeaker. The demodulated audio appears across 200kW resistor R2. 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. 104 Silicon Chip Celebrating 30 Years siliconchip.com.au