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Coming up in Silicon Chip Balanced Inputs & Attenuator for the USB SuperCodec Rather than resting on his laurels, Phil Prosser has produced an add-on board for his SuperCodec USB Sound Card which adds two balanced inputs and selectable attenuation settings of 0dB, 10dB, 20dB or 40dB. It fits in the same case as the SuperCodec and provides professional balanced audio recording. Making PCBs with a laser engraver Advertising Index Altronics...............................81-84 Ampec Technologies................. 31 Dave Thompson...................... 111 Digi-Key Electronics.................... 3 Andrew Woodfield describes how you can use a low-cost laser engraver to transfer a PCB pattern onto a blank fibreglass/copper laminate. This avoids the need to purchase pre-sensitised PCBs or sensitising film, and once you have the procedure down, it allows for easy and relatively painless etching. Emona Instruments................. IBC Jaycar............................ IFC,53-60 MicroElectroMechanical Systems (MEMS) Keith Rippon Kit Assembly...... 111 We’ve used MEMS devices before but haven’t described how they work in detail. Dr David Maddison’s article explains what they are, how they are made and shows the many different types of MEMS available. The article includes electron microscope images showing the amazing precision of these tiny devices. LD Electronics......................... 111 Leach PCB Assembly............ OBC LEDsales................................. 111 Ten LED Christmas Ornaments We will have multiple Christmas projects in our November issue, including two different, impressive LED Stars that you can fit atop your Christmas tree (or just put on display). Plus, we will describe eight mini LED Ornaments which are cheap, easy to build, and look great. The latest 8-pin PIC features Microchip continues to improve their 8-bit portfolio, having introduced several parts over the last few years which are cheaper than their predecessors, but also faster with more memory and better peripherals. Tim Blythman takes a look at what's available and which parts give you the best bang-for-your-buck. Microchip Technology................ 21 Mouser........................................ 7 Ocean Controls........................... 5 RayMing PCB & Assembly.......... 4 Rohde & Schwarz........................ 9 Silicon Chip Binders............... 111 Vintage Radio Battery Power Supply Silicon Chip Shop.................... 51 A relatively compact circuit which generates A- and B-battery voltages suitable for most battery-powered vintage radios from four Li-ion cells (eg, 18650s).This means you can easily bring your battery-powered vintage radio into the modern age! Silicon Chip Subscriptions....... 97 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. Tronixlabs................................ 111 The November 2020 issue is due on sale in newsagents by Thursday, October 29th. Expect postal delivery of subscription copies in Australia between October 27th and November 11th. The Loudspeaker Kit.com........... 6 Vintage Radio Repairs............ 111 Wagner Electronics................... 63 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. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au