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circuit diagram has it drawn correctly (anode to pin 2 of IC3). I initially suspected I had a faulty L6571 (IC3). I have since replaced it with a new one, but it made no difference. (A. C., Kelso, NSW) ● Notes & Errata can be viewed from siliconchip.au/Articles/Errata – in this case, there are no relevant entries. Diode D7 is orientated correctly in the circuit diagram; it is just that the 180kW resistor and series-­connected diode are transposed. The circuit operation is the same. So long as IC3 has at least 10.5V as a supply, it should operate. Otherwise, check the component placement, soldering and for any shorts between adjacent connections. Also verify that your replacement L6751 is the A version, not the B version. We supply the A version in our parts set as that is what the design requires. This is a popular project with hundreds built and few complaints, so we don’t think it has any major flaws. You Advertising Index Altronics.................................57-60 Dave Thompson........................ 111 Digi-Key Electronics...................... 3 Emona Instruments.................. IBC Hare & Forbes..........................OBC icom Australia............................. 10 Jaycar.............................. IFC, 9, 11, .........................26-27, 43, 86-87, 97 Keith Rippon Kit Assembly....... 111 Lazer Security........................... 111 LD Electronics........................... 111 LEDsales................................... 111 likely have either a dud component or a placement/soldering problem. Pressure sensor for Ignition System I am considering buying the parts you have available for the Programmable Ignition System for Cars (MarchMay 2007; siliconchip.au/Series/56) on your website. I am having trouble finding the part number for the PCB-mounted pressure sensor and where I could purchase it. Do you know of anywhere there still might be a complete kit available? (P. H., Blackburn, Vic) ● All kits for that project have been discontinued. The Sensym pressure sensor is unavailable, so we recommend using a MAP (Manifold Absolute Pressure) sensor instead, available from a salvage yard/wrecker. Use a 1bar sensor for naturally aspirated engines or a 2bar sensor for boosted engines. The article shows how to use a MAP sensor. Although the kits have been discontinued, the major parts like the PCBs and programmed microcontroller are available from the Silicon Chip shop (siliconchip.au/Shop/?article=2233). You should be able to obtain the rest from electronic component retailers. Car radio antenna amplifier wanted Did Electronics Australia ever publish an antenna amplifier for AM reception in car radios etc? I can’t seem to find any! I still have a stack of EA magazines dating back to the mid-1960s. I loved EA back in the day. I first saw EA in the library when I attended technical school in the 1960s. I was so fascinated by the articles that I began Mouser Electronics....................... 4 SC GPS Analog Clock............... 108 SC Radio TV & Hobbies............ 105 Silicon Chip PDFs on USB....... 109 Silicon Chip Shop.................88-89 Silicon Chip Subscriptions........ 71 The Loudspeaker Kit.com............ 6 Tronixlabs.................................. 111 Wagner Electronics..................... 93 112 Silicon Chip Errata & Sale Date for the Next Issue Microchip Technology.................. 7 to make some of the projects. I was lucky that Mum got me a Scope soldering iron and a multimeter for my 13th birthday (a long time ago). I eventually left school and gained an apprenticeship as a radio and TV technician the year Man walked on the moon. Unfortunately, with the later demise of the TV repair industry, I had to switch trades. It’s sad that we lost all of the commercial manufacturing of electronics, TVs, radios etc. I did work at Flexdrive near Melbourne for a while; they made electronic speedos, trip computers and integrated electronics for the automotive industry (all Australian designed and built). They are gone too. I remember an article in EA about Fairchild semiconductor manufacturing in Australia; they’re also gone! Believe it or not, Dyne is still making transformers in Melbourne. I remember Leo Simpson’s articles and built many projects that interested me. (T. R., via email) ● EA published several antenna amplifiers for AM radio. The following was taken from the index: siliconchip. au/Static/EA%20Projects • 2/AE/48 Low Cost Booster for AM Reception (antenna) (August 1994) • 2/AE/49 The ‘Miracle’ AM Antenna (November 1996) We have also published the following projects: • Simple Car Antenna Amplifier (December 1988 issue; siliconchip.au/ Article/7574) • Passive Loop Antenna For AM Radios (June 1989 issue; siliconchip. au/Article/7458) • AM Loop Antenna & Amplifier (October 2007 issue; siliconchip.au/ Article/2398) • AM Broadcast Band Portable Loop Antenna (January 2009 issue; siliconchip.au/Article/1280) SC Arduino LC/ESR Meter, August 2023: there are two errors in the wiring diagram, Fig.3. (1) The wires from A0, A2 & A3 on the shield should go to A1, A2 & A3 on the Arduino, respectively, not A0, A1 & A2. (2) The connections to switch S1 for the 10kΩ resistor and grey wire that goes to the GND terminal on the Arduino should be swapped. The leftmost and rightmost connections for S1a in Fig.2 should also be swapped. CD Spot Welder, March & April 2022: in Table 1 on page 28, the second entry for the 39mF capacitors has the wrong part number/ link to Mouser. It should be https://au.mouser.com/ProductDetail/871B41231A5399M000 (not -002). Next Issue: the November 2023 issue is due on sale in newsagents by Thursday, October 26th. Expect postal delivery of subscription copies in Australia between October 25th and November 13th. Australia's electronics magazine siliconchip.com.au