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Coming up in Silicon Chip Automotive Electronics Advertising Index Altronics...............................75-82 In this two-part series, Dr David Maddison describes the many types of electronic modules found in modern cars, trucks, vans and buses and also how they communicate with each other. You might be surprised to learn just how many electronic modules are in your car, and how advanced they are. Ampec Technologies................. 11 Dave Thompson...................... 111 Digi-Key Electronics.................... 5 Digital Lighting Controller, part three This follow-up article contains details of an alternative ‘slave’ unit which can drive up to 64 sets of addressable RGB LEDs. You can mix and match this LED slave with the mains-light controlling slave already described. We’ll also demonstrate how to attach RGB LEDs directly to an Arduino or Maximite ‘master’, allowing more than 64 lighting channels to be driven. Heart Beat Simulator Emona Instruments................. IBC Hare & Forbes..........................2-3 Jaycar............................ IFC,53-60 Keith Rippon Kit Assembly...... 111 LD Electronics......................... 111 Make a soft toy for your kid or pet to cuddle up with that has a life-like heartbeat. This small device produces a soft noise and vibration that simulates a beating heart, powered by an internal battery. Power saving techniques mean that it should last a long time. Making PCBs with a laser engraver 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. Leach PCB Assembly.................. 9 LEDsales................................. 111 METCASE Enclosures.............. 63 Microchip Technology......... 7,OBC Ocean Controls........................... 8 RayMing PCB & Assembly.......... 6 SC Christmas Decorations........ 43 The Bass Block This easy-to-build subwoofer is relatively compact but will really add oomph to a small speaker system. It is based on principles described in our “Bass Barrel” project from August 1997, but using more modern drivers that you can still purchase. SC Colour Maximite 2............... 85 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The Loudspeaker Kit.com......... 66 The December 2020 issue is due on sale in newsagents by Thursday, November 26th. Expect postal delivery of subscription copies in Australia between November 24th and December 11th. Silicon Chip Subscriptions....... 52 Silicon Chip Online Shop......... 33 Tronixlabs................................ 111 Vintage Radio Repairs............ 111 Wagner Electronics................... 10 Notes & Errata USB SuperCodec, August-October 2020: on page 74 of the October 2020 issue, in the testing procedure, the text states that the ±9V rails should each measure between ±8.5V and ±10.5V. However, the resistor values specified for the final design could result in readings as low as ±8V (typically around ±8.2V). This is normal, and the circuit will operate as designed. Also note that the L1 and L3 part numbers given for Digi-key in the parts spreadsheet are a bit larger than the ones used in the prototype; it is better to use the parts from Altronics or Jaycar if possible (which were the ones tested). History of the Australian GPO, September 2020: on page 40, the article states that the Australian mains voltage standard was changed in 2000 to 230V AC +6%,-10%. It was in fact changed to 230V AC +10%,-6%. Shirt Pocket Oscillator, September 2020: the inductors specified for L1 are both too big to fit easily in the space available. The Murata 17156C is a good fit, with the slightly cheaper and slightly larger Murata 22R156C also being a reasonable choice. Frequency Reference Signal Distributor, April 2020: the MAX4450s are specified in the parts list as being the SOT-23-5 version (MAX4450EUK+T), but the PCB is designed for the SC-70-5 version (MAX4450EXK+T). Make sure to use the latter type. 45V 8A Linear Bench Supply, October-December 2019: in the parts list on page 74 of the November 2019 issue, the correct part code for transistors Q4-Q7 is FJA4313, not FJA4314. The full part code we used (and supply) is FJA4313OTU. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au