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Next Month in Silicon Chip Electromagnetic Launchers and Rail Guns Dr David Maddison takes a look at these devices which are starting to take over launch duties on aircraft carriers and may eventually replace the guns on navy ships. They offer significant advantages for aircraft launching compared to steam catapults and as weapons, offer the possibility of a potent weapon with a much smaller weight and size compared to a traditional gun. Super-7 AM Radio part two We’ll present the PCB design for the Super-7 AM radio and go through the assembly, testing and set-up/alignment procedure for this radio. We will also show you how to assemble the custom-made Acrylic case. nRF24L01+ 2.4GHz Wireless Data Transceiver Modules Jim Rowe describes the operation of these 2Mbps digital radio modules with software that lets you communicate with a pair of Arduino or Micromite modules. This article was held over from last month due to space constraints. WiFi Water Tank Level Meter and Weather Station This project uses a commercially available pressure sensor and ESP8266 controller board to upload water tank level, temperature, humidity and barometric pressure periodically to “the cloud”. You can check the data and plot it in graphs from a smart phone, tablet or PC from just about anywhere. It’s solar powered and easy to build and set up. Temperature-based Proportional Fan Controller This design is simple and compact yet very useful. It can control a small or large fan to cool a computer, automobile or even house - whatever you need to force air through. It switches the fan on and adjusts its speed depending on a temperature reading and also includes a low-battery switch-off feature with extremely low quiescent current. Note: these features are prepared or are in preparation for publication and barring unforeseen circumstances, will be in the next issue. The December 2017 issue is due on sale in newsagents by Thursday, November 23rd. Expect postal delivery of subscription copies in Australia between November 23rd and December 15th. Advertising Index Accelerated Concepts.................... 8 Altronics................................ FLYER Dave Thompson......................... 111 Digi-Key Electronics....................... 5 element14...................................... 7 Embedded Logic Solutions.......... 16 Emona Instruments.................... IBC ERNTEC Pty Ltd.......................... 14 Freetronics................................... 13 H K Wentworth / Electrolube........ 12 Hare & Forbes............................. 2-3 Jaycar............................... IFC,53-60 KCS Trade.................................... 79 Keith Rippon Kit Assembly......... 111 Keysight Technologies.............. OBC LEACH Co Ltd.............................. 15 LD Electronics............................ 111 LEDsales.................................... 111 Master Instruments...................... 23 Microchip Technology.............. 17,91 Mouser Electronics....................... 11 Ocean Controls............................ 10 Pakronics..................................... 16 PCBcart...................................... 81 Rohde & Schwarz.......................... 9 Sesame Electronics................... 111 SC Online Shop.................. 108-109 SC Radio, TV & Hobbies DVD.... 105 Silicon Chip Subscriptions........ 103 Tronixlabs................................... 111 Vintage Radio Repairs............... 111 WAGO.......................................... 63 Notes & Errata GPS-Synchronised Analog Clock Driver, February 2017: another bug has been identified in the sweep hands versionSC of the software. Its output drive waveforms were not always correct and this caused weak output drive and potentially slow operation. A new version of the firmware, v1.4, is now available for download from the Silicon Chip website which solves this. Deluxe Touchscreen eFuse (July, August & October 2017): a couple of changes need to be made to prevent false tripping and rebooting. First, change the two 4.7kW resistors to 100kW. Then, add two 220pF capacitors. The first one goes between the base (middle pin) of Q2 and the nearby ground point, where the adjacent 30kW resistor connects to the large ground trace. This can be mounted on the underside of the PCB. The second 220pF capacitor is similarly connected between the base of Q4 and ground; the top end of the nearby 100nF bypass capacitor for REG3 can be used (it’s connected to the middle pin of REG3 by a track on the top side). Li-ion and LiPo Charger Modules, August 2017: on page 44, the article refers to red LED2 and green LED1. It should instead refer to red LED1 and green LED2, to be consistent with the circuit diagram (Fig.1) on the following page. 3-Way Active Stereo Crossover for Loudspeakers, August-September 2017: 38 1kW SMD resistors are required, not 37 as stated in the parts list on page 34 of the September issue. 0.01Hz - 6GHz+ Touchscreen Frequency Meter, Part 1, October 2017: on pages 28 & 29 timer 2/3 and timer 4/5 should be swapped with regards to their explanation. The block and circuit diagram are both correct. 112 Silicon Chip Celebrating 30 Years siliconchip.com.au