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Coming up in Silicon Chip Differential GPS (DGPS) This system provides precise location and distance measurements in a 3D space with accuracy down to about 10cm, compared to an error measured in metres for standard GPS receivers. We take a look at the technology involved and some of the real-world applications for it. Four-channel DC Fan and Pump Controller Advertising Index Altronics...............................72-75 AEE Electronex......................... 65 Dave Thompson...................... 103 Digi-Key Electronics.................... 3 An updated speed controller for DC fans and pumps which runs from a 12V supply, can switch up to 40A of fans and/or pumps based on temperatures from up to four sensors. It’s configured over a USB interface and can also provide real-time feedback on its operation. Electrolube.................................. 5 PICkit 4 Review Hare & Forbes....................... OBC Tim Blythman takes an in-depth look at Microchip’s new in-circuit programmer and debugger for PIC and AVR microcontrollers. He has been using it extensively for testing and debugging PIC32 software and reports on his experiences. Jaycar............................ IFC,49-56 Super Digital Sound Effects Module, Part Two LD Electronics......................... 103 The second article has the construction details along with detailed information on how to configure and use our new Sound Effects module. LEACH Co Ltd............................. 9 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The September 2018 issue is due on sale in newsagents by Thursday, August 30th. Expect postal delivery of subscription copies in Australia between August 28th and September 13th. Emona Instruments................. IBC HAKKO........................................ 5 Keith Rippon Kit Assembly...... 103 LEDsales................................. 103 Master Instruments................... 27 Microchip Technology................ 33 Ocean Controls......................... 13 QualiEco Circuits....................... 59 Notes & Errata Philips Compact Cassette and EL3302 Cassette Recorder, July 2018: at the top of page 28 it states that the EL3302 had a battery comprising five AA cells but as shown in the schematic on page 30 (Fig.5), it actually used five C cells. Super-7 AM Radio, November & December 2017: the parts list includes four 22nF MKT polyester capacitors and one 47nF MKT polyester. It should instead list five 22nF capacitors and no 47nF capacitors. New SC200 Audio Amplifier, January-March 2017: The circuit diagram for the SC200 shows a 150W resistor in series with VR1. This should be 120W to match the overlay diagram and parts list. Also, the overlay diagram shows a 100pF 250V capacitor; this should be 150pF 250V as shown in the circuit diagram and parts list. The PCB has the correct markings. Silicon Chip BackPack............. 11 Silicon Chip Shop...............82-83 Silicon Chip Subscriptions..... 101 SC Radio, TV & Hobbies DVD... 99 The Loudspeaker Kit.com......... 12 Tronixlabs................................ 103 Vintage Radio Repairs............ 103 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. 104 Silicon Chip Australia’s electronics magazine siliconchip.com.au