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Coming up in Silicon Chip Advertising Index Arduino Vidor 4000 review Altronics...............................76-79 This compact new Arduino board has a number of unique features such as an onboard field-programmable gate array (FPGA), WiFi, Bluetooth and an HDMI video output. Cypher Research Labs............. 13 Diode Curve Plotter With this project, we’ve taken a zener diode tester to the next level. It actually plots the device’s I/V curve on an LCD screen and is suitable for use with zener diodes, TVSs, LEDs and standard diodes, among other devices. Dave Thompson...................... 111 Digi-Key Electronics.................... 3 Emona..................................... IBC Hare & Forbes....................... OBC Jaycar............................ IFC,53-60 Keith Rippon Kit Assembly...... 111 High-current linear bench supply This power supply has very low ripple and noise due to the use of linear regulation. But it can still deliver plenty of current (more than 5A) with an output of up to 50V. LD Electronics......................... 111 LEACH Co Ltd........................... 93 LEDsales................................. 111 Low Energy Developments...... 111 Smartphone medicine, part two In this follow-up article, Dr David Maddison describes many new medical applications for smartphones which involve interfacing the phone to external hardware. This includes detecting cancer with an “artificial nose”, doing DNA analysis in the field, detecting and classifying viruses, blood pressure and cardiac monitoring, and picking up food-based allergens, plus some other great examples of modern medical technology. Microchip Technology.................. 5 Trailing Edge touch and remote controlled Dimmer, part two Silicon Chip Shop...........102-103 Mouser Electronics...................... 9 Ocean Controls......................... 10 SC Micromite BackPack.......... 107 Silicon Chip Back Issues.......... 41 This follow-up article has all the Touch & IR Remote Control Dimmer construction details, plus testing and installation instructions. Silicon Chip Subscriptions..... 109 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. Tronixlabs................................ 111 The March 2019 issue is due on sale in newsagents by Thursday, February 28th. Expect postal delivery of subscription copies in Australia between February 26th and March 13th. Wagner Electronics..................... 6 The Loudspeaker Kit.com......... 11 Vintage Radio Repairs............ 111 Weller Soldering Iron................... 7 Notes & Errata Isolated Serial Link, January 2019: if using the device for isolating circuitry floating at mains potential, the following precautions must be observed: 1) It must be mounted in an Earthed metal or double-insulated case before connecting it to the mains-powered equipment (ideally, within the same enclosure). Only the isolated connections should be brought outside the case. If mounting in a separate case, the wiring to the mains-powered equipment must be mains-rated and properly insulated at both ends. 2) Either omit the isolated power supply circuitry or build the version using MOD1, not transformer T1. 3) If using MOD1, lengthen the slot underneath it until it nearly touches OPTO1 (the slot is already lengthened on RevH boards) 800W(+) UPS, May-July 2018: the Altronics chassis-mount LEDs mention in the parts list on page 33 of the May 2018 issue (Cat Z0222, Z0224 & Z0226) do not have integral current-limiting resistors. You will either need to solder a resistor of around 1kW in series with each LED or use chassis-mount LEDs which already have resistors, such as Jaycar Cat SL2644/SL2645 or Altronics Cat Z0264/Z0265. Full Wave, 230V Universal Motor Speed Controller, March 2018: in the circuit diagram (Fig.1) on page 36, the “Active In” wire from FUSE1 is shown connecting to the top-most terminal of CON1 and it then goes through the core of transformer T1. This is incorrect; the wire from FUSE1 goes directly to T1, then to CON1 and on to the A1 terminal of TRIAC1. The overlay and wiring diagram (Fig.2) on page 40 is correct. BackPack Touchscreen DDS Signal Generator, April 2017: the 560W resistor in the parts list should actually be 470W. SC200 Audio Amplifier Module, January-March 2017: in the alternative SMD parts list on page 81 of the February 2017 issue, Q1 should be listed as a BCM856DS, not a BC856. Q2, Q5 and Q6 are all listed correctly as BC856 types. 12AX7 Valve Audio Preamplifier, November 2003: in the power supply circuit diagram (Fig.8) on page 30, VR1 and its series 220kW resistor are shown swapped compared to the PCB layout. VR1’s wiper and the top end of the track connect to the junction of the 47kW and 680kW 1W resistors. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au