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Coming up in Silicon Chip Anodising aluminium Advertising Index Altronics...............................73-76 Professionally-made aluminium pieces are often anodised for protection against damage and corrosion, or to change their colour. Sometimes you don’t have that option, though, especially when you are making aluminium panels at home. But the anodising process is not that complicated and you can do it at home with just a few basic tools and chemicals. We’ll explain how. Stealth Technology Stealth technology doesn’t just apply to aircraft; ships, vehicles and even people can be rendered harder to detect using the various technologies described in this article. Dr David Maddison describes the latest developments in radar stealth as well as techniques for reducing infrared emissions, generated noise, and even attempts to make vehicles and people invisible to the naked eye! The H-field Transanalyser Dr Hugo Holden developed this all-in-one instrument for aligning, testing and troubleshooting AM transistor radios. It can also be used with valve sets; the modulated test signal can be coupled into a ferrite rod antenna without making any direct electrical connections to the circuit, thus avoiding detuning it or otherwise affecting its operation. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The May 2020 issue is due on sale in newsagents by Thursday, April 30th. Expect postal delivery of subscription copies in Australia between April 28th and May 8th. Notes & Errata AM/FM/CW Scanning HF/VHF RF Signal Generator, June & July 2019: the de­ signer discovered that some rotary encoders look identical but work differently, re­ sulting in erratic operation. The V14 firmware addresses this; by default, it works with pulse-type encoders. You can identify these by testing continuity across the two internal switches; if they are both always open when the encoder is at rest, it is a pulse-type. With the level type, one or both switches may be closed at rest, depending on the encoder’s rotation. If you have a level-type encoder and the V14 software, solder a 100kW resistor from pin 28 of the Atmel chip to ground, on the underside of the PCB. That will change the software mode to work with level-type encoders. Ampec Technologies................. 97 Control Devices......................... 11 Dave Thompson...................... 103 Digi-Key Electronics.................... 3 Emona Instruments................. IBC Jaycar............................ IFC,49-56 Keith Rippon Kit Assembly...... 103 LD Electronics......................... 103 LEACH PCB Assembly............... 5 LEDsales................................. 103 METCASE Enclosures................ 4 Microchip Technology........ OBC, 7 Mouser Electronics...................... 9 Ocean Controls......................... 63 RayMing PCB & Assembly.......... 8 SC Micromite BackPack............ 37 Silicon Chip PDFs.................... 48 Silicon Chip Shop.................... 99 The Loudspeaker Kit.com......... 61 Triple Point Calibrations............. 10 Vintage Radio Repairs............ 103 Wagner Electronics..................... 6 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 Australia’s electronics magazine siliconchip.com.au