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MARKET CENTRE Advertise your product or services here in Silicon Chip KIT ASSEMBLY & REPAIR FOR SALE PCB PRODUCTION DAVE THOMPSON (the Serviceman from Silicon Chip) is available to help you with kit assembly, project troubleshooting, general electronics and custom design work. No job too small. Based in Christchurch, New Zealand, but service available Australia/NZ wide. Email dave<at>davethompson.co.nz LEDsales PCB MANUFACTURE: single to multilayer. Bare board tested. One-offs to any quantity. 48 hour service. Artwork design. Excellent prices. Check out our specials: www.ldelectronics.com.au KEITH RIPPON KIT ASSEMBLY & REPAIR: * Australia & New Zealand; * Small production runs. Phone Keith: 0409 662 794 keith.rippon<at>gmail.com LEDS, BRAND NAME AND GENERIC LEDs, filament LEDs, LED drivers, heatsinks, power supplies, kits and modules, components, breadboards, hardware, magnets. Please visit www. ledsales.com.au Silicon Chip Binders REAL VALUE AT $21.50 PLU S P&P PMD WAY offers (almost) everything for the electronics enthusiast – with full warranty, technical support and free delivery worldwide. Visit pmdway.com to get started. Order online from www.siliconchip.com.au/ Shop/4 or call (02) 9939 3295. ADVERTISING IN MARKET CENTRE Classified Ad Rates: $32.00 for up to 20 words (punctuation not charged) plus $1.20 for each additional word. Display ads in Market Centre (minimum 2cm deep, maximum 10cm deep): $82.50 per column centimetre per insertion. All prices include GST. 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 phone (02) 9939 3295. amplifier, but can I locate this inside the vacant area next to the amplifier board? (I. S., Glenhaven, NSW) ● Alternative drivers are available from Wagner Electronics but you will need to change a few dimensions to fit them. The critical TC6FD00-04s can be replaced with 2.5-inch Daichi midrange/woofers, Wagner Cat HFS6415-8. These are rated at 8W rather than 4W, meaning a higher supply voltage may be desirable, and they will need a larger diameter hole (55mm). They are slightly taller, needing a 70mm tall baffle (your proposed changes will accommodate this). For the tweeters, you could use Daytona 6W 20FA-6 3/4-inch Neodymium types, Cat ND20FA. The slightly higher impedance should not cause any problems. An alternative to the Vifa TG9FD1004 woofer is the Dayton PC83-4 3-inch siliconchip.com.au full-range 4W driver, also available from Wagner. This is slightly taller at 46.5mm and has a smaller diameter (78.5mm) so you will need to change the cut-out dimensions to fit it up. While these substitute drivers are similar, they will probably require different relative drive levels to the original set, but that’s easily accommodated by the suggested amplifier, which lets you adjust the levels individually by ear. Changing the isoundBar width to 1m is fine. As you’re reducing the width by 19.4%, increasing the internal height by 19.4%, from 64mm to 80mm, should keep the internal volumes similar. That will help you fit the slightly larger drivers too. You should also adjust the baffle positions proportionally, reducing the width of each internal chamber by roughly 20%. Australia's electronics magazine It’s OK to install the power supply in the box, but ensure adequate cooling and shielding, and make sure any mains wiring is properly insulated and the wire colours are correct. We purposefully avoided any mains voltages in the project to make it beginner-­ friendly. We hope this advice helps you. Connector pin order isn’t obvious Hi, I recently purchased the Pico BackPack Kit and during assembly, I determined that the PCB (07101221 RevC) differs from the circuit diagram in March 2022 (siliconchip.au/ Article/15236). The circuit diagram that I have shows jumper JP2 connected to pin 9 of CON4 and pin 13 of CON4/GP16. When I was about to install JP2, I noted a track to pin 2 of CON4, which May 2026  111