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Next Month in Silicon Chip Getting Started with the Micromite, Part Three Advertising Index In the third part of Geoff Graham's MMBasic programming tutorial, he covers some more advanced subjects such as data types, arrays and drawing text on an LCD screen. Allan Warren Electronics........... 95 Industrial Robots Altronics...............................64-67 Dr David Maddison takes an in-depth look at the history of industrial robots, which perform many important tasks with a speed and precision that humans can't match. Digi-Key Electronics.................... 3 How to use LTspice to simulate circuits Emona Instruments................. IBC The first in a series of easy-to-follow, step-by-step tutorials on using the free LTspice Windows circuit simulation software from Linear Technology. Hare & Forbes....................... OBC Ultrasonic Anti-fouling for Boats, Mk2 High Profile Communications.... 95 This revised anti-fouling unit drives two transducers, has soft-start to prevent nuisance fuse blowing, simplified set-up and neon indicators to show output activity. Jaycar ........................... IFC,45-52 1000:1 6GHz+ Prescaler Keith Rippon Kit Assembly........ 95 Allows a standard frequency counter to be used for signals up to 6GHz and beyond. Has a selectable division ratio for better resolution with intermediate frequencies. LD Electronics........................... 95 Note: these features are prepared or are in preparation for publication and barring unforeseen circumstances, will be in the next issue. The May 2017 issue is due on sale in newsagents by Thursday April 27th. Expect postal delivery of subscription copies in Australia between April 27th and May 12th. Notes & Errata Pool Lap Counter, March 2017: on the circuit diagram two 1kW resistors are SC missing between the bases of Q4 & 6 and the collectors of Q3 & 5 respectively. Both are shown correctly on the PCB and are listed in the parts list. Stationmaster, March 2017: on page 36, Fig.2, LED5 is mistakenly listed twice, LED4 is the one closest to CON3. Also, CON2 is shown with all its connections shorted on Fig.2, the PCB has the correct connections made. Squash and Ping-Pong, Circuit Notebook, February 2017: Trimpot VR1 should be connected directly to the +5V rail rather than junction of the reset switch and 100nF capacitor. If this is not done, the speed of the ball cannot be properly adjusted. Voltage/Current Reference with Touchscreen, October & December 2016: in the overlay diagram (Fig.3) on page 66 of the December 2016 issue, a 10nF capacitor is shown below and to the right of IC3 (near the centre at the top of the board). This should be 100nF instead, to reduce noise in the output. It is shown correctly in the circuit diagram in the October issue, between pins 1 and 2 of IC5a, and listed correctly in the parts list. The PCB correctly shows this as 100nF on the silkscreen. SemTest, February, March & May 2012: in the parts list on page 86 in May 2012, SCR1 is incorrectly listed as a TYN812 semiconductor, where it should be a TYN816. LEDsales................................... 95 Master Instruments................... 95 Microchip Technology................ 17 Mouser Electronics...................... 5 Ocean Controls........................... 9 Pakronics................................... 24 Rohde & Schwarz........................ 7 Sesame Electronics.................. 95 SC Online Shop...................82-83 SC Radio & Hobbies DVD......... 93 Silicon Chip Binders.................. 13 Silicon Chip Wallchart............... 57 Silicon Chip Subscriptions......... 25 Silvertone Electronics................ 24 Tronixlabs............................. 11,95 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. 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