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Coming up in Silicon Chip 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 Dave Thompson...................... 103 Digi-Key Electronics.................... 5 Electrolube.................................. 9 High-Sensitivity Magnetometer Emona Instruments................. IBC This design uses off-the-shelf components to detect extremely small changes in magnetic field strength. It can be used as a very sensitive metal detector or for a number of other purposes, including moving vehicle detection. Hare & Forbes..........................2-3 Isolated Serial Link 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. HK Wentworth Ltd....................... 9 Jaycar............................ IFC,49-56 Keith Rippon Kit Assembly...... 103 LD Electronics......................... 103 LEACH Co Ltd........................... 67 LEDsales................................. 103 El Cheapo Modules Master Instruments................... 11 The tiny DFPlayer Mini MP3 Player module plays audio files in MP3, WMA and WAV formats from a microSD card or USB flash drive, to either a mono speaker, stereo headphones or line level outputs all for just a few dollars. METCASE Enclosures.............. 47 Low-voltage, High-current DC Motor Speed Controller Part two of this series will appear in the December issue. It includes PCB construction and wiring details plus set-up, testing and usage instructions. Microchip Technology........... 13,31 Mouser Electronics.................... 15 NPA Pty Ltd............................... 61 Ocean Controls......................... 12 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. PCBcart................................... 71 The December 2018 issue is due on sale in newsagents by Thursday, November 29th. Expect postal delivery of subscription copies in Australia between November 27th and December 12th. Rohde & Schwarz........................ 7 Notes & Errata Super Digital Sound Effects Module, August & September 2018: in Fig.6 on page 81 of the September issue, the 330kW resistor below the 1MW resistor next to REG1 is incorrectly labelled as 22kW. It is correct in the circuit diagram and on the production PCBs. Also, since publishing these articles, we discovered that there is an alternative version of IC3 (IS31AP4991), the IS31AP4991A. This was not mentioned in the original data sheet and it has a different pinout, so it will not work in our design. Avoid using that chip. Replacement chips have already been sent to those who would have received the incorrect IC from us. PCB Designs........................... 103 SC Vintage Radio DVD.............. 45 Silicon Chip Xmas Tree.......... 101 Silicon Chip Shop...............96-97 Silicon Chip Subscriptions....... 87 The Loudspeaker Kit.com......... 59 TRIO Test & Measurement.... OBC Tronixlabs................................ 103 Vintage Radio Repairs............ 103 Wagner Electronics................... 10 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