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Coming up in Silicon Chip Universal 6-24V Battery Charge Controller This Battery Charge Controller turns a ‘dumb’ battery charger into a smart charger, suitable for use with various 6V, 12V or 24V batteries, including leadacid, gel-cell, Li-ion and LiFePO4 (lithium-ion phosphate). It has three preset charging profiles and three adjustable profiles with one to three-stage charging. Advertising Index AEE Electronex........................... 5 Altronics...............................82-85 Ampec Technologies................. 13 50V 8A Linear Bench Supply Blamey Saunders hears.............. 9 Coming soon, this fully analog design which delivers plenty of current with low noise. We will also be presenting a low-cost digital multi-parameter panel meter that can be added to it, to monitor its various operating parameters. Control Devices......................... 51 How Satellite Navigation (GNSS) Works Digi-Key Electronics.................... 3 Dr David Maddison explains how satellite navigation systems work, including GPS (USA), GLONASS (Russia), Galileo (EU), BeiDou (China), NavIC (India) and QZSS (Japan). Dave Thompson...................... 127 Electrolube Australia................. 48 ELF Electronics......................... 15 New Arduino Nanos Emona..................................... IBC We take a look at the new Nano Every (based on the ATmega4809) and Nano 33 IoT (ATSAMD21 Cortex-M0+ with WiFi & Bluetooth LE) modules. Hare & Forbes....................... OBC Three I/O Expander modules Jaycar............................ IFC,61-68 Running out of microcontroller pins? These low-cost modules make it a breeze to add more functions to your existing micro. In some cases, they won’t take up any more pins on your existing micro and can add dozens more, including pins with PWM capability. Keith Rippon Kit Assembly...... 127 Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The October 2019 issue is due on sale in newsagents by Thursday, September 26th. Expect postal delivery of subscription copies in Australia between September 25th and October 11th. Notes & Errata Fluidics and Microfluidics, August 2019: on page 17, the images for Fig.8 and Fig.9 are swapped. Dual 12V Battery Isolator, July 2019: if you use the specified LP2950 regulator, it’s necessary to add a 4.7kW resistor between 5V and GND for the unit to work properly. It will also work with a 78L05 regulator in place of the LP2950, although that will increase the quiescent current by around 3mA, compared to adding the resistor which only increases it by around 1mA. Future PCBs supplied will have a location to fit this extra resistor. AM/FM/CW HF/VHF RF Signal Generator, June & July 2019: the second article describes the core for transformer T1 as being 7mm long in some places and 14mm long in others. It should be 7mm, although a 14mm core will work; it’s just harder to fit. Also, if you use the Jaycar Cat QP5516 LCD with DIL pin header, you need to swap the pin 1 & 2 connections from the PCB (by replacing those two pins with short lengths of wire) as its pinout is slightly different from the Altronics Cat Z7018 LCD. This is not necessary for the Jaycar Cat QP5521 LCD which has a SIL pin header. Finally, some constructors have found that the 1kW resistor next to Q4 on the PCB (connected to its collector) needs to be increased in value (eg, to 10kW) so that the unit can be switched off by pressing S3. Bridge-mode Audio Amplifier Adaptor, May 2019: in Fig.30 on p70, the negative terminal of CON4 is incorrectly drawn as being connected to both pins 1 & 2 of CON5. The positive terminal of CON4 only connects to pin 1 of CON5, and the negative terminal only connects to pin 2. 128 Silicon Chip Australia’s electronics magazine LD Electronics......................... 127 LEACH PCB Assembly............. 47 LED Autolamps........................... 6 LEDsales................................. 127 Mastercut Technologies............. 12 Microchip Technology........... 11,57 Mouser Electronics................. 7,99 Ocean Controls........................... 8 On-Track Technology............... 113 PCB Designs........................... 127 Rohde & Schwarz...................... 49 Silicon Chip Shop...........120-121 The Loudspeaker Kit.com....... 119 Triple Point Calibrations............. 46 Tronixlabs................................ 127 Vintage Radio Repairs............ 127 WAGO Pty Ltd........................... 45 Wagner Electronics................... 10 Wiltronics Research.................... 4 siliconchip.com.au