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Coming up in Silicon Chip 4-axis Motorised Chair for Simulators Motorised chairs can be used to increase realism in racing and flight simulators, but they’re expensive. This article shows you how to build your own from scratch, including a Micromite-based motor controller interface which connects to your PC via USB and is compatible with a wide range of software. Cyber-espionage and Cyber Weapons This two-part series from Dr David Maddison is a window into the fascinating world of Cyber-espionage. The first part focuses on techniques which can be used to extract information from devices without the consent or knowledge of the operators, by exploiting hardware design flaws. It also includes a section on surreptitiously modifying electronic devices to spy on the operators. Advertising Index AEE Electronex......................... 41 Altronics...............................44-47 Ampec Technologies................. 11 Dave Thompson...................... 111 Digi-Key Electronics.................... 3 Emona..................................... IBC Hare & Forbes....................... OBC HRSA Radiofest.......................... 6 Micromite Explore 28 Jaycar............................ IFC,53-60 This tiny module has the power of the 28-pin Micromite, but it also incorporates an onboard power supply, USB/serial interface and programming interface. Despite this, it’s barely any larger than a 28-pin DIL package IC. And it’s available as a kit or a pre-built module, so that you can get up and running (and programming in MMBasic) straight away. Keith Rippon Kit Assembly...... 111 Rechargeable LED bicycle light This device uses a switchmode converter to drive a string of LEDs from a rechargeable lithium-ion battery pack. It has multiple light modes and automatically reduces the LED current to prevent overheating. Universal 6-24V Battery Charge Controller This revised Battery Charge Controller is more flexible than our previous designs. It turns a ‘dumb’ battery charger into a smart charger, suitable for use with various types of 6V, 12V or 24V batteries, including lead-acid, gel-cell, Li-ion and LiFePO4 (lithium-ion phosphate). You can select between one of three preset charging profiles or one of three adjustable profiles, and choose between one, two or three-stage charging. LD Electronics......................... 111 LEACH Co Ltd............................. 9 LEDsales................................. 111 Microchip Technology.................. 5 Ocean Controls........................... 8 PCB Designs........................... 111 Rohde & Schwarz........................ 7 Silicon Chip Back Issues........... 89 Silicon Chip Shop.............104-105 Silicon Chip Subscriptions......... 95 The Loudspeaker Kit.com......... 10 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. Tronixlabs................................ 111 The September 2019 issue is due on sale in newsagents by Thursday, August 29th. Expect postal delivery of subscription copies in Australia between August 27th and September 13th. Wagner Electronics................... 33 Vintage Radio Repairs............ 111 Wiltronics Research.................... 4 Notes & Errata Versatile Trailing Edge Dimmer, February-March 2019: the infrared remote control specified for this project (Little Bird SF-COM-14865) has been changed to emit different remote control codes. This new version looks slightly different from the original as it has dotted white circles around the buttons (see photo). If you have this version of the remote, you will need to use the revised version of the firmware (1011119B.HEX) which has been modified to expect the new set of remote control codes. Low-power AM Transmitter, March 2018: on the PCB, the connections to pins 2 & 3 (D & S) of Mosfet Q3 have been swapped, rendering the reverse polarity protection inoperative. This has been fixed on the RevD PCB. For earlier PCB revisions, these pins should be bent and crossed over, with one insulated using a short length of heatshrink tubing or similar. LifeSaver For Lithium & SLA Batteries, September 2013: in some cases, reverse leakage through the dual diode can affect the voltage at pin 3 of IC1, causing the voltage thresholds to be lower than expected and possibly preventing their adjustment via VR1. As this connection to the diode is not necessary for operation, constructors should cut the top-side track between VR1 and the diode (between VR1 and ZD1) or use a BAT54 diode rather than a BAT54C. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au