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Coming up in Silicon Chip 3D printing ­– the latest technology David Maddison takes an in-depth look at all the latest 3D printing technology, including many amazing commercial applications, including building homes! AM/FM/DAB+ Radio with Touchscreen Interface This is a world-first; a DIY world radio which can receive AM, FM and DAB+ broadcasts. It's controlled using a Micromite Explore 100 module with a 5-inch colour touchscreen and has an on-board amplifier for driving stereo speakers, a headphone output, line outputs and provision for external AM and VHF antennas. Advertising Index Altronics............................. FLYER Anritsu....................................... 33 Blamey Saunders hears............ 36 Dave Thompson...................... 103 Digi-Key Electronics.................... 3 Emona Instruments................. IBC Freetronics.................................. 9 Isolated Serial Link Hare & Forbes....................... OBC This small and easy-to-build board provides optical isolation for two devices communicating over a 3.3V or 5V level serial link. It's great for connecting a micro module with a mains or battery power supply to a PC, to prevent power glitches and avoiding damage to the PC from a fault in the connected module. Jaycar............................ IFC,49-56 Primer on stepper motors Stepper motors are used in a variety of electromechanical devices, including hard disk drives, CD/DVD/Blu-ray players, laser cutters and 2D/3D printers. Jim Rowe details how stepper motors work, and how you use them. The BWD 216A valve+transistor power supply BWD was a major Australian electronics manufacturer from 1955 to the 1980s. This power supply, released in the mid 1970s, truly showed off their prowess. It could deliver 0-400V with an adjustable current limit of 0-200mA, and had a separate isolated 0-250V output at up to 50mA. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The January 2019 issue is due on sale in newsagents by Monday, December 31st. Expect postal delivery of subscription copies in Australia between December 28th and January 11th. Keith Rippon Kit Assembly...... 103 LD Electronics......................... 103 LEACH Co Ltd........................... 41 LEDsales................................. 103 Microchip Technology............. 7,93 Mouser Electronics.................... 23 Ocean Controls......................... 10 PCBcart................................... 37 PCB Designs........................... 103 PicoKit....................................... 43 Premier Batteries...................... 73 Rohde & Schwarz........................ 5 SC Vintage Radio DVD............ 101 Silicon Chip Xmas Tree.......... 100 Silicon Chip Shop...............82-83 Silicon Chip Subscriptions....... 57 Notes & Errata Tinnitus & Insomnia Killer, November 2018: on page 65, the text refers to Fig.2 as showing the pink noise output but it is actually shown in Fig.3. LED Tachometer, October & November 2006: in the circuit diagram (Fig.3), on page 29 of the October issue, Q2 and Q3 should be labelled as BC557 types, not BC337. Switchmode Power Supplies..... 31 The Loudspeaker Kit.com........... 6 Tricom Components.................... 8 Tronixlabs................................ 103 Vintage Radio Repairs............ 103 Wagner Electronics................... 11 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 Australia’s electronics magazine siliconchip.com.au