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Coming up in Silicon Chip How Satellite Navigation (GNSS) Works Dr David Maddison explains how satellite navigation systems work, including GPS (USA), GLONASS (Russia), Galileo (EU), BeiDou (China), NavIC (India) and QZSS (Japan). Super-9 Analog Stereo FM Radio This radio provides mono or stereo FM reception with excellent sound quality. It’s quite sensitive and built mostly from discrete components, with a handful of ICs. It’s quite easy to build and suitable for beginners, especially those interested in learning how an FM radio receiver works. Advertising Index Altronics...............................87-90 Ampec Technologies................. 69 Dave Thompson...................... 111 Digi-Key Electronics.................... 3 Emona..................................... IBC Hare & Forbes....................... OBC Jaycar............................ IFC,53-60 Three I/O Expander modules 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...... 111 Toyota Synergy Hybrid Drive LEDsales................................. 111 Toyota produces arguably the best hybrid drive system, able to move a vehicle under petrol or electric power (or both) with outstanding fuel economy. It provides regenerative braking and the ability to charge the battery while moving or stationary. We take a look at how this clever system works. Microchip Technology.................. 5 Universal 6-24V Battery Charge Controller PCB Designs........................... 111 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. Note: these features are planned or are in preparation and should appear within the next few issues of Silicon Chip. The November 2019 issue is due on sale in newsagents by Thursday, October 24th. Expect postal delivery of subscription copies in Australia between October 22nd and November 8th. LD Electronics......................... 111 LEACH PCB Assembly............... 9 Mouser Electronics...................... 7 Ocean Controls........................... 6 Premier Batteries...................... 11 Silicon Chip Shop...............40-41 Silicon Chip Subscriptions....... 97 The Loudspeaker Kit.com........... 8 Tronixlabs................................ 111 Vintage Radio Repairs............ 111 Wagner Electronics................... 68 Notes & Errata Six-decade Resistor Sorter, Circuit Notebook, September 2019: pin 8 of IC1-IC3 must be connected to the anode of LED7, not the cathode, for the circuit to work correctly. Gamer’s Simulation Seat (High-current H-bridge), September 2019: the 74LS08 IC in the H-bridge should be replaced with a 74HC08 as the LS-series chip has an insufficiently high output voltage to drive the IRFZ44N Mosfets properly. Ideally, those Mosfets should also be changed to a logic-level equivalent such as the CSD18534KCS (Silicon Chip Online Shop Cat SC4177) to ensure they switch on fully with a 5V supply. Voice Modulator for Sound Effects, Circuit Notebook, August 2019: the diodes in the bottom half of both bridges should be reversed in polarity to form ‘rings’. Also, the 180kW resistor should be changed to 150kW. Vintage Radio (National AKQ), July 2019: in the circuit diagram on page 95, both batteries are shown with the wrong polarity. This has been fixed in the online version of the magazine. 433MHz Data Range Extender, May 2019: the dimensions of the Jaycar LO1242 powdered-iron core are 15 x 8 x 6.5mm, not 25 x 15 x 10mm as mentioned in the article. High power H-bridge uses discrete Mosfets, Circuit Notebook, November 2017: the same comment about the 74LS08 chip applies as mentioned above for the Gamer’s Simulation Seat. RGB to Component Video Converter, October 2004: the divider resistors at output pins 7 of IC1b and IC2b should be changed to 820W (upper) and 270W (lower), resulting in a gain of A = 4 to these stages, in order to achieve the required 2(R-Y) and 2(BY) signals at these pins. Note that a separate erratum was published for this project in February 2005. 112 Silicon Chip Australia’s electronics magazine siliconchip.com.au