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Coming up in Silicon Chip El Cheapo Modules – RF attenuators Advertising Index Altronics.................................. 66-69 Jim Rowe describes a programmable, 63-step, 4GHz RF digital step attenuator module with a range of applications. Aussie Rechargeable Irons.......... 83 Gut Gas Sensors Dave Thompson........................... 95 This innovative technology from an Australian university allows doctors to monitor gas levels in the digestive system of patients in real-time. Patients could even potentially go home and come back later as data is logged to a mobile phone via Bluetooth. The logged data can then help diagnose digestive ailments. Digi-Key Electronics....................... 3 Introduction to programming the Cyprus CY8CKIT This low-cost module incorporates a 32-bit microcontroller and a set of reprogrammable analog circuitry which can be used for a wide range of tasks. We show you how to use the free Integrated Development Environment. Magic eye display for audio systems Blamey Saunders hears................. 7 Emona........................................ IBC Freetronics................................... 13 Hare & Forbes.......................... OBC Jaycar.............. IFC,45-52,CATALOG Keith Rippon Kit Assembly........... 95 LD Electronics.............................. 95 LEACH Co Ltd.............................. 25 Retro is cool and you can't get much more retro than a 6E1P magic eye valve (electron-ray indicator). It glows green with a dancing pattern that varies with the audio signal applied. Use it as an audio level indicator or just for a fun display to spice up your sound system. LEDsales...................................... 95 USB Port Protector Pakronics..................................... 57 If you're developing an Arduino (or similar) project using a PC or laptop and powering it from a USB port, it is possible to accidentally damage your computer. We learned this the hard way. Our low-cost Port Protector greatly reduces the risk by preventing voltages outside the acceptable range from reaching your USB port. Premier Batteries......................... 12 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. Silicon Chip Subscriptions.......... 21 The May 2018 issue is due on sale in newsagents by Thursday, April 26th. Expect postal delivery of subscription copies in Australia between April 26th and May 10th. Master Instruments........................ 9 Microchip Technology.............. 11,35 Ocean Controls............................ 10 Rohde & Schwarz.......................... 5 Sesame Electronics..................... 95 Silicon Chip Online Shop....... 92-93 The Loudspeaker Kit.com.............. 8 Tronixlabs..................................... 95 Vintage Radio Repairs................. 95 Wagner Electronics...................... 33 Notes & Errata Full Wave 10A Motor Speed Controller, March 2018: The mains Active wiring to the fuse holder shown in Fig.2 should show the incoming mains wire (brown) connecting to the tip of the fuse holder rather than the side ring terminal. The wire through the current transformer should then connect to the side ring terminal of the fuse holder. Also, the paragraph before the “Current Feedback” cross-heading on page 39 refers to pin 2 connecting to the 4.7nF capacitor. It should say pin 5. These errors have been fixed in the online edition. Budget Senator Loudspeakers, May-June 2016: in the May issue, on page 39: the dimensions given in Figs.4 & 5 are wrong. The correct dimensions are given on page 77 of the June 2016 issue. The dimensions should be: top → 417 x 336, front → 730 x 300, rear → 720 x 300, sides → 730 x 417, base → 300 x 381. All other dimensions are the same, and the MDF board thickness is still 18mm. Making Power From Rubbish, February 2018: there is an error in the fourth paragraph. The generator produces 52MW, not 52MWh per year. Circuit Ideas Wanted Got an interesting original circuit that you have cleverly devised? We will pay good money to feature it in Circuit Notebook. We can pay you by electronic funds transfer, cheque or direct to your PayPal account. Or you can use the funds to purchase anything from the SILICON CHIP on-line shop, including PCBs and components, back issues, subscriptions or whatever. Email your circuit and descriptive text to editor<at>siliconchip.com.au 96 Silicon Chip Celebrating 30 Years siliconchip.com.au