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Notes & Errata Universal Speaker protector Mk3 (November 2015): the SMD bridge rectifier pads on the published (RevB) PCB are not wired correctly. The negative terminal goes go GND rather than LK1. As a result, if LK1 is left out but the SMD bridge rectifier is fitted, it will burn out or a track will fuse. In this case, cut the track to the bridge rectifier’s negative pad (coming from the left side). This is Advertising Index fixed with the RevC PCB, which will be supplied once the stock of RevB boards is exhausted. High Visibility 6-Digit LED GPS Clock, December 2015 & January 2016: the circuit diagram (Fig.1) on page 39 of the December 2015 issue shows R8 and R9 swapped. They are correct on the overlay diagram (Fig.2) on page 42. Allan Warren Electronics.............. 95 Altronics.................................. 76-79 Digi-Key Electronics....................... 5 DSCAPE...................................... 95 Glyn Ltd NZ.................................. 17 Hare & Forbes............................. 2-3 High Profile Communications....... 95 Icom Australia.............................. 21 IMP Printed Circuits..................... 11 Jaycar .............................. IFC,45-52 Ask SILICON CHIP . . . continued from page 95 with a GPS receiver. You would have to try it but applying 1Hz pulses to the 1PPS input should keep the time locked to that source. You would need to set the initial time manually. The latest firmware (RevD) adds a function whereby a button on the remote can switch the application of the current time zone on and off, switching the display between it and UTC/GMT. If you build two clocks, you could wire the GPS pins up in parallel and use a single module. The clocks should then stay perfectly synchronised. You would need to set them up using different sets of IR remote control codes. Programming the LCD BackPack I have ordered the kit for the LCD BackPack from the February 2016 issue. I am new to Micromite programming, although I have been using the Proton Basic interface for quite a few years, so BASIC is fairly simple for Next Issue KCS Trade.................................... 15 The May 2016 issue of SILICON CHIP is due on sale in newsagents by Thursday 28th April. Expect postal delivery of subscription copies in Australia between April 28th and May 6th. Keysight Technology..................... 71 me. The only question that I have is how to link to the Micromite panel to upload the program. Do I need to build the ASCII Video Terminal, as described in the July 2014 issue, to do this? (M. F., Wyongah, NSW). • You could use the ASCII Video Terminal to program the Micromite LCD BackPack but you don’t have to. You can use any computer with a serial interface. Most people would use a USB-toserial adaptor to program the Micromite. This was mentioned/explained in previous Micromite articles, eg, on page 33 of the May 2014 issue. It was also explained in some detail on pages 24 & 25 of the February 2016 issue. There are plenty of places to get USB serial interfaces, eg, Jaycar XC4464 and SC Altronics Z6225. Monster Electronics........................ 8 Keith Rippon Kt Assembly ........... 95 LD Electronics.............................. 95 LEDsales...................................... 95 Master Instruments...................... 13 Microchip Technology................... 33 Oatley Electronics........................ 11 Ocean Controls............................ 29 PCBCART...................................... 7 RF Modules Australia............... OBC Rohde & Schwarz.......................... 9 Rolec OKW.................................. 10 Sesame Electronics..................... 95 SC Radio & Hobbies DVD............ 93 Silicon Chip Binders..................... 90 Silicon Chip Online Shop............. 85 Silicon Chip Subscriptions........... 39 Silicon Chip Wallchart................ IBC Silvertone Electronics.................. 59 Tronixlabs................................ 38,95 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. 96  Silicon Chip siliconchip.com.au