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Coming up in Silicon Chip Smartphone medicine There are hundreds of smartphone apps used for medical diagnosis and testing, from identifying skin cancers and tracking the blood sugar level of diabetics, to laboratory-style field tests for bacteria and viruses. Dr David Maddison describes many of these emerging technologies, some of which are already in use. 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. Trailing Edge universal touch and remote control dimmer This dimmer can be used with a wide variety of lighting including dimmable LEDs. But unlike many so-called universal dimmers, it can also handle multiple incandescent lamps. It’s adjusted either by touch (with one or two touch panels) or using an infrared remote control. USB Mouse & Keyboard Adaptor These days, most keyboards and mouses are USB only. Many microcontroller projects could benefit from a keyboard or mouse, but you generally don’t have a spare USB host interface. This clever project allows you to easily connect a keyboard and/or mouse to just about any micro. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The February 2019 issue is due on sale in newsagents by Thursday, January 24th. Expect postal delivery of subscription copies in Australia between January 22nd and February 8th. Advertising Index Altronics...............................24-27 Anritsu....................................... 33 Dave Thompson...................... 111 Digi-Key Electronics.................... 3 Emona..................................... IBC ETM Pacific Pty Ltd..................... 8 Hare & Forbes....................... OBC Jaycar............................ IFC,53-60 Keith Rippon Kit Assembly...... 111 LD Electronics......................... 111 LEACH Co Ltd........................... 85 LEDsales................................. 111 Microchip Technology................ 43 Mouser Electronics...................... 5 Ocean Controls........................... 7 PCBcart..................................... 9 SC Micromite BackPack............ 37 SC Vintage Radio DVD............ 109 Silicon Chip Shop...........104-105 Silicon Chip Subscriptions....... 63 Switchmode Power Supplies..... 11 The Loudspeaker Kit.com........... 6 Tronixlabs................................ 111 Vintage Radio Repairs............ 111 Wagner Electronics................... 65 Notes & Errata USB digital and SPI interface board, November 2018: the PCB design is missing a track from pin 10 of IC1 to pin 4 of CON4. It can be added using a short insulated wire link on the underside of the board, or you can use pin 3 of CON3 as MISO/DO instead. We will order PCBs with the corrected pattern (RevB) once the current batch (RevA) has sold out. GPS-Synched Frequency Reference, October and November 2018: in the circuit diagram (Fig.2) on pages 30 & 31 of the October issue, REG1 should be included inside the red dotted box indicating the oven section. Also, some items are missing from the Parts list on page 33 of the October 2018 issue. Add one 18-pin female header socket and one 4-pin female header socket for connection to the BackPack module (CON1). Constructors may also need three female-female DuPont jumper leads, to cut in half and solder to the GPS module wiring for connection to the header on the main board. Automatic Reverse Loop Controller, October 2012: in the circuit diagram (Fig.2) on page 40, OPTO2 is incorrectly labelled as a 2N28. It should be 4N28. Also, in the PCB overlay diagram on page 41 (Fig.3) and the parts list on the same page, the 390W resistor should be changed to 330W to agree with the circuit diagram. 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