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programming shield. Thank you for your help. (D. G., Quebec, Canada) ● According to its documentation, the TimerOne library used in the DCC Programmer sketch only works with the ATmega328 processor (ie, Arduino Uno and not Mega), so we are unsure how you got the DCC Booster Shield working. We’re assuming you are testing the Programmer with the Single Loco sketch. The Passthrough Supervisor sketch only checks the DCC and does not generate any DCC signals. The loco moving is probably due to the DCC Programmer Shield applying steady DC to the tracks. Most locos will default to ‘DC conversion’ and respond to DC signals if no valid DCC signal is present. If you can get a multimeter on the track, you should be able to confirm whether there is only DC present. DCC will manifest as an AC signal at around 6kHz. If you can send us some photos of your construction, we can look and see if you’ve missed anything. Testing with an Arduino Uno would also be a good idea, as that is what we used. Advertising Index How to reverse stepper motor drive Altronics.................................37-40 Blackmagic Design....................... 5 Dave Thompson........................ 103 Emona Instruments.................. IBC Jaycar....................IFC, 9, 11, 26-27 ....................................51, 62-63, 83 Keith Rippon Kit Assembly....... 103 Sourcing fuel injector solenoid I’m interested in building the Arduino-­ controlled Fuel Injection System for Small Engines from the January 2014 issue (siliconchip.au/ Article/5665). I have managed to find most of the parts, but I’m having trouble finding the injector solenoid valve, as no part number is mentioned in the article. Can you please tell me where I can find the part? Thank you in advance. (L. H., via email) ● The article is from quite a while back and parts can become more difficult to obtain over such time spans. There are some fuel-rated solenoids available but they are not identical to the one used in the prototype. Some that we found don’t list an operation life, so we can’t find one that is guaranteed to be suitable. The 12V version of the DN8 at the following links may be suitable: siliconchip.au/link/abr8 siliconchip.au/link/abr9 I am trying to get a stepper motor to run a ½ turn forward, then a ½ turn backward repeatedly. I am referring to Circuit Notebook for August 2011 (siliconchip.au/Article/1125), which is the only relevant article I found. I have the motor running clockwise but cannot get it to run anti-clockwise. Lazer Security........................... 103 LD Electronics........................... 103 Microchip Technology......... OBC, 7 Mouser Electronics....................... 3 PCBWay................................. 12, 13 PMD Way................................... 103 SC Breadboard PSU.................. 102 Silicon Chip Binders.................. 25 Silicon Chip PDFs on USB......... 10 Silicon Chip Shop.................90-91 Silicon Chip Subscriptions........ 99 Silicon Chip VGA PicoMite........ 60 The Loudspeaker Kit.com............ 8 Wagner Electronics..................... 89 104 Silicon Chip Errata and Sale Date for the Next Issue LEDsales................................... 103 What pin setting do I need for this? (P. C., Balgal Beach, Qld) ● You should be able to reverse the motor direction by going through the steps backwards. Instead of step 1, step 2, step 3, step 4, step 1 ... you would do step 4, step 3, step 2, step 1, step 4 ... Converting leading edge dimmer to trailing edge I built the Touch and/or Remote Controlled Light Dimmer (January & February 2002; siliconchip.au/ Series/116) back in the day, and it worked great. It is a leading-edge dimmer, suitable for incandescent bulbs but not so good for modern LEDs. The S576A chip is old and seems to have been replaced by the LS7231. Nowhere in the LS7231 data sheets does it say “leading edge” or “trailing edge”. Could the LS7231 be a direct replacement for the S576A? Do you know of a trailing edge chip that could replace the S576A? The latest Touch Dimmer that you published needed a programmed chip. (D. M., Port Melbourne, Vic) ● The LS7231 IC is not capable of trailing edge dimming. We published a remote-controlled trailing edge dimmer design in the February & March 2019 issues (siliconchip.au/ Series/332). As with virtually all of our designs, the programmed chip and PCBs are available from our Online Shop (siliconchip.au/Shop/?article =11403). We also sell some of the harder-to-get parts for that project; see the link above. SC Coin Cell Emulator, December 2023: in the circuit diagram (Fig.1) on p73, pin 2 of IC2 should only connect to the 22W resistor above and the output network below. On the PCB, it does not connect to the 10kW resistor and 100nF capacitor at its left in the circuit, nor should it. 1kW+ Class-D Amplifier Pt2, November 2023: in the Fig.15 wiring diagram on p78, the brown wires connected to the IEC mains input socket should be light blue (Neutral), and the light blue wires should be brown (Active). That means the connections to the A & N terminals of the switchmode supplies from the IEC socket should also be swapped. Modem/Router Watchdog, November 2023: the V3 software, available from our website, fixes some bugs and includes some improvements. If the first NTP check failed, it would always reboot the router, and a delay has been added shortly after booting to make it easier to break into the MMBasic command prompt using CTRL-C. A problem with the uf2 file has also been fixed. Finally, if loading the firmware manually, run the “AUTOSAVE” command before pasting the program into the terminal. Next Issue: the February 2024 issue is due on sale in newsagents by Monday, January 29th. Expect postal delivery of subscription copies in Australia between January 29th and February 16th. Australia's electronics magazine siliconchip.com.au