Fullscreen HTML5Med Res (??MB)HTML4

MARKET CENTRE Cash in your surplus gear. Advertise it here in SILICON CHIP ELNEC IC PROGRAMMERS Battery Packs & Chargers High quality Realistic prices Free software updates Large range of adaptors Windows 95/98/Me/NT/2k/XP C O N T R O L S Tough times demand innovative solutions! CLEVERSCOPE USB OSCILLOSCOPES 2 x 100MSa/s 10bit inputs + trigger 100MHz bandwidth 8 x digital inputs 4M samples/input Sig-gen + spectrum analyser Windows 98/Me/NT/2k/XP IMAGECRAFT C COMPILERS ANSI C compilers, Windows IDE AVR, TMS430, ARM7/ARM9 68HC08, 68HC11, 68HC12 GRANTRONICS PTY LTD www.grantronics.com.au Siomar Battery Engineering www.batterybook.com Phone (08) 9302 5444 Circuit Ideas Wanted Made in Australia, used by OEMs world-wide splat-sc.com Do you have a good circuit idea? If so, sketch it out, write a brief description of its operation & send it to us. We pay up to $100 for an original circuit so send your idea to: Silicon Chip Publications, PO Box 139, Collaroy, NSW 2097. KIT ASSEMBLY & REPAIR FOR SALE PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone (02) 8068 2713. sesame<at>sesame.com.au www.sesame.com.au LEDs! Nichia, Cree and other brand name LEDs at excellent prices. LED drivers, including ultra-reliable linear driver options. Many other interesting and hard-to-find electronic items! www.ledsales.com.au PCBs & Micros: Silicon Chip Pub­ lications can supply PCBs and programmed micros for recent (and some not so recent) projects described in the magazine. Phone ( 02) 9939 3295 or email silicon<at>siliconchip.com.au questronix.com.au – audiovisual experts solve home, corporate security and devotional installation & editing woes. QuestAV CYP, Kramer TVone (02) 4343 1970 or sales<at>questronix. com.au WANTED CUSTOMERS WANTED: Truscotts Electronic World – large range of semiconductors and passive components for industry, hobbyist and amateur projects including Drew Diamond. 27 The Mall, South Croydon, Melbourne. Phone (03) 9723 3860. www.electronicworld. com.au ADVERTISING IN MARKET CENTRE Classified Ad Rates: $29.50 (incl. GST) for up to 20 words plus 85 cents for each additional word. Display ads: $54.50 (incl. GST) per column centimetre (max. 10cm). Closing date: 5 weeks prior to month of sale. To book, email the text to silicon<at>siliconchip.com.au and include your name, address & credit card details, or fax (02) 9939 2648, or phone (02) 9939 3295. siliconchip.com.au KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith 0409 662 794. keith.rippon<at>gmail.com GEOFF COPPA KIT ASSEMBLY AND TROUBLE SHOOTING SERVICE. Phone Geoff on 0414226102. coppamitchell2<at>bigpond.com Issues Getting Dog-Eared? $14. REAL VALUE AT 95 PLUS P &P Keep your copies of SILICON CHIP safe with these handy binders Available Aust. only. Price: $A14.95 plus $10 p&p per order (includes GST). Just fill in and mail the handy order form in this issue; or fax (02) 9939 2648; or call (02) 9939 3295 and quote your credit card number. June 2012  103 Advertising Index Altronics...........................loose insert Dyne Industries................................ 7 Embedded Logic Solutions.............. 8 Emona Instruments........................ 11 Geoff Coppa................................. 103 Grantronics.................................. 103 Harbuch Electronics..................... 101 Hare & Forbes............................ OBC Instant PCBs................................ 103 Ask SILICON CHIP DOWNLOAD OUR CATALOG at . . . continued from p102 www.iinet.net.au/~worcom circuitry based on an Analog Devices AD8495 precision instrumentation amplifier. MPPT operation misunderstood According to the schematic supplied for the MPPT Solar Charge Controller in the March 2012 issue, there is no voltage conversion that is characteristic of a MPPT controller. I believe it is not really an MPPT device. Just having a bit of smarts does not qualify. (J. H., via email). • The MPPT operation of this project was fully explained in the first article, in the February 2011 issue. The voltage WORLDWIDE ELECTRONIC COMPONENTS PO Box 631, Hillarys, WA 6923 Ph: (08) 9307 7305 Fax: (08) 9307 7309 Email: worcom<at>iinet.net.au conversion is done by switching the Mosfet at 31.25kHz under the control of the micro. There is a brief mention of this PWM (pulse width modulation) in the caption of the circuit diagram on page 92 of the March 2012 issue. So the microcontroller is actually providing two functions: MPPT for the solar panel and 3-stage charging for the battery. If you would like a copy of the February 2011 issue, we can supply it for $12 including postage and packSC ing. Notes & Errata Ultra-LD Mk.3 200W Amplifier Module, Pt.2 (August 2011): the Dynamic Headroom specification was calculated incorrectly. It should be 1dB for 8Ω loads and 1.3dB for 4Ω loads. The Music Power and Slew Rate figures are correct. USB MIDIMate (October 2011): the 18-pin IC socket specified in the parts list should be a 20-pin IC socket. Crystal DAC (February 2012): the original PCB has the trimpots rotating in the opposite direction to that stated in the article, ie, clockwise rotation decreases the quiescent current rather than increasing it. A modified PCB file has been uploaded to the website which fixes this prob104  Silicon Chip lem. Constructors using the original PCB should rotate both trimpots fully clockwise before applying power for the first time. 1.5kW Induction Motor Speed Controller (April-May 2012): the PCB overlay diagram (May, p69) shows two 270Ω resistors below IC3 which should have been labelled 100Ω (their value is wrong in the parts list too). Also, the circuit diagram (April, p22) shows the three pull-up resistors for the pins of CON5 (two 4.7kΩ & one 1.5kΩ) all connected to pin 1 of CON4. They are actually connected to the +3.3V rail. Finally, the Altronics catalog number for the 470μF 400V capacitors in the parts list is incorrect. It should be R5448. Jaycar ................................ IFC,49-56 Keith Rippon................................. 103 Kitstop............................................ 45 LED Sales.................................... 103 LHP.NET.AU................................. IBC Microchip Technology..................... 15 Mikroelektronika............................. 23 Oatley Electronics.......................... 31 Ocean Controls................................ 6 Quest Electronics......................... 103 Radio & Hobbies DVD.................... 45 Reality Design.................................. 7 Red Button Technologies................. 5 RF Modules.................................. 104 Roc-Solid......................................... 9 Sesame Electronics..................... 103 Silicon Chip Binders................ 72,103 Silicon Chip Bookshop................... 88 Silicon Chip Order Form................ 97 Silicon Chip Partshop..................... 96 Silicon Chip Subscriptions............. 89 Siomar Battery Engineering...... 3,103 Splat Controls.............................. 103 Truscotts Electronic World............ 103 Verbatim Lights.............................. 81 Wiltronics....................................... 10 Winradio Communications............. 25 Worldwide Elect. Components..... 104 siliconchip.com.au