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Coming up in Silicon Chip DownUnder GeoSolutions' Supercomputer DUG's supercomputer is up there with some of the fastest in the world, and it was all done locally in Perth. The supercomputer is used to help DUG find gas and oil deposits deep underground using seismic surveys. Advertising Index Altronics............................. 24-27 Control Devices.................. OBC Dave Thompson................... 111 El Cheapo Modules Jim Rowe describes two low-cost electronic compass modules which sense the Earth's weak magnetic field. He explains how to use these modules with an Arduino and Micromite, including compensation for variations between the magnetic field lines and the local meridian, to give accurate compass readings. Digi-Key Electronics................. 3 Expandable LED Christmas Tree Jaycar......................... IFC,53-60 This simple but ingenious design can be expanded from a small, simple flashing LED Christmas Tree up to a large design that branches out to cover a much larger area. It's dead easy to build, doesn't cost much and we've also designed a small and simple control module which produces different LED patterns. Emona Instruments.............. IBC Hare & Forbes........................ 63 Keith Rippon Kit Assembly... 111 LD Electronics...................... 111 LEACH Co Ltd........................ 11 Vintage Radio The 1939 HMV 904L is a valve-based 5-inch TV with integrated 3-band AM receiver. It's a 16-valve design, compatible with the old 405-line TV standard. This example was in a sorry state but was stripped right back to the bare chassis and received a complete restoration. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The November 2018 issue is due on sale in newsagents by Thursday, October 25th. Expect postal delivery of subscription copies in Australia between Octobber 23rd and November 8th. Notes & Errata Steam Train Whistle / Diesel Horn, September 2018: in Fig.1, the 100kW resistor to the right of JP4 should be between JP4 and the mixing junction, with no connection to the 5V rail. On page 36, the text states that microcontroller IC1 generates the volume control signal but it is IC2 instead. On page 37, the reference to Fig.3 should be to Fig.2. On page 38, in the panel, it should read "... around eight seconds.", not "... around eight settings." Finally, the Jiffy box should be a UB5 type, not UB3. Arduino Data Logger, August-September 2017: a reader discovered a bug in the code which sometimes caused the unit to fail to detect the GPS module. This has been fixed in software version v1.12 which is now available for download from the Silicon Chip website. LEDsales.............................. 111 Master Instruments................... 7 Microchip Technology............. 37 Ocean Controls........................ 9 PCB Designs........................ 111 Silicon Chip Back Issues......... 5 Silicon Chip Shop............. 88-89 Silicon Chip Subscriptions.. 109 Silicon Chip Wallchart........... 81 Silicon Chip RTV&H DVD.... 107 The Loudspeaker Kit.com......... 8 Tronixlabs............................. 111 Vintage Radio Repairs......... 111 Wagner Electronics................ 80 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. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au