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burning out by using a ballast resistor. Then add in the dwell feature that starts to charge the coil a fixed period before firing. Note that if the RPM is high, the full dwell period may not be available as there isn't the time to fit in firing and the full dwell period before the next firing. You need to have a minimum firing period so that the dwell period will not reduce spark duration at high RPM. Can SiDRADIO be used with the Raspbery pi? Can I use the DVB-T dongle, as featured in the SiDRADIO project (October-November 2013) with the latest version of the Raspberry Pi? I have subscribed to Silicon Chip for seven years and it's a great magazine! (C. J., Samson, WA) • You possibly can but bear in mind that the SiDRADIO design is based on Windows software. If you wanted to interface to the Raspberry Pi, you need to use a different software package. Unfortunately, we are not in a position to help you with this but it looks like what you are asking about has been done already; have a look at: www. rtl-sdr.com/tag/raspberry-pi/ ETI 601 Music Synthesiser kit I can see from your website that you are involved in old DIY kits from ETI magazine. I'm interested in purchasing the kits or parts (eg, PCB) for an old ETI Project (601 Music Synthesiser 3600/4600: October 1973 to July 1974) about the construction of an ETI 4600 analog synthesiser. (A. G., by email) • This was a true breakthrough project design for ETI and it has never been bettered. It is now over 40 years old and while virtually all of the electronic components should still be available, there are no PCBs and nor do we have the PCB (tape) artworks in our archive, unfortunately. Even if the boards and metalwork were still available, building it today would be a very expensive proposition and you would be able to provide all its facilities with a much cheaper digital design you can now buy off the shelf. However, if you want to peruse all the articles we can provide PDFs and these can be ordered from our online shop. Advertising Index Allan Warren Electronics...... 103 Altronics............................. 76-79 Digi-Key Electronics................. 3 Freetronics.............................. 65 Hare & Forbes.................... OBC Jaycar ........................ IFC,49-56 Keith Rippon Kit Assembly ...103 LD Electronics...................... 103 LEDsales.............................. 103 Master Instruments................... 9 Error compiling the Arduino ECG software Microchip Technology............... 5 I have downloaded the software for the Arduino-based USB ECG monitor that appeared in your October 2015 issue. The problem is that when I verify/compile the sketch, I get an error in "Assemblyinfo.cpp" as follows: "System is not a namespace-name". I am running Windows 8.1 and I compiled the sketch on a computer with Windows XP with the same results. Can you help please? (J. W., via email) • This sounds like an error with your Arduino IDE installation; "Assemblyinfo.cpp" is not part of our source code but it may be an internal file used by Arduino. We suggest you try installing the latest version of the Arduino IDE, in case the one you currently have installed contains an error. The latest version, at the time of writing this, is V1.6.12 and it is available as a free download. We just checked that the sketch compiles using the version we currently have installed (V1.6.7) and it completed without errors. SC Ocean Controls...................... 11 Mouser Electronics................... 7 PCB Cart.............................. IBC Sesame Electronics.............. 103 SC Online Shop........ 25,100-101 SC Radio & Hobbies DVD...... 99 Silicon Chip Binders............... 81 Silicon Chip PCBs.................. 13 Silicon Chip Subscriptions...... 15 Silvertone Electronics............. 13 Tronixlabs............................. 103 Next Issue The February 2017 issue is due on sale in newsagents by Monday January 26th. Expect postal delivery of subscription copies in Australia between January 24th and February 10th. 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 siliconchip.com.au