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Advertising Index Altronics.................................39-42 Blackmagic Design....................... 7 Dave Thompson........................ 103 DigiKey Electronics..................OBC Electronex..................................... 5 Emona Instruments.................. IBC Hare & Forbes........................10-11 Jaycar............................. IFC, 22-25 Keith Rippon Kit Assembly....... 103 LD Electronics........................... 103 LEDsales................................... 103 Microchip Technology.................. 9 Mouser Electronics....................... 3 PE Back Issues........................... 52 PCBWay....................................... 35 PMD Way................................... 103 SC Bridge Rectifiers.................... 79 SC ESR Test Tweezers............. 101 Silicon Chip Binders.......... 59, 103 Silicon Chip Kits........................ 76 Silicon Chip PDFs on USB......... 98 Silicon Chip Subscriptions........ 53 Silicon Chip Shop.................86-87 The Loudspeaker Kit.com............ 8 Wagner Electronics..................... 83 Errata and on-sale date Airzone 6552A, Vintage Radio, May 2026: in the circuit diagram, C4 is pointed to the wrong capacitor, it should point to the capacitor directly below C3. Some components also had incorrect values, the correct values are – R10 is 250kΩ; R12 is 500kΩ; R14 is 250kΩ; and capacitor C1 is 250nF. Digital Vehicle Compass, Circuit Notebook, April 2026: on p17, the SDA and SCL connections going down vertically from the Arduino’s SDA and SCL pins are swapped. All the SDA pins should be joined together, and similar for the SCL pins. PicoSDR, April 2026: in Fig.3 on p39, pin 39 of the Pico (VSYS) should be connected to +5V. Next Issue: the July 2026 issue is due on sale in newsagents by Monday, June 29th. Expect postal delivery of subscription copies in Australia between June 26th and July 13th. 104 Silicon Chip the reference voltage on the thermocouple interface, and would need to pay attention to limit cases such as low-temperature operation. The current calibration process zeroes out the absolute offset. The actual precision of the thermocouple really limits what you should be expecting to achieve; you probably want to balance the effort you put in with the benefit you would get. The PIC microcontroller is hugely programmable in its I/O capability. Look into the data sheet for your options, which you need to configure with the other inputs and outputs. Depending on how you implement this, you will need to check the temperature scaling, but I suspect will be OK with the calibration. To be honest, I wonder if the rework of the code will deliver a great benefit. Knowing how agricultural my coding style is, you may end up tearing a few handfuls of hair out, though. Converting Nano Pong to HDMI output I built the Nano TV Pong kit a while ago (August 2021 issue; siliconchip. au/Article/14988) and it works well plugged into a TV with component inputs. But I want it to output HDMI. I’ve tried to use a component-­toHDMI converter (Jaycar Cat AC1722) and the screen comes up, but it goes away after a few seconds with “No Signal” being displayed for a few seconds, then back to the game display. I’ve tried different TVs, and the No Signal is the same display on each of them, so I assume it’s coming from the converter box. The sound works fine throughout. Any ideas? I am a long-term reader back to Radio, TV & Hobbies. (M. H., Parkinson, Qld) ● The signal from the Nano Pong is composite video. Since the AC1722 Converter states that it supports composite video, it should work. It seems like the converter thinks that the signal is going away and coming back for some reason. Have you tried changing the resolution setting on the Converter? We are not sure that will help, but it would be worth trying. We found some forum posts that suggested the 720p setting would work better (despite 1080p sounding like it should be ideal). The Converter may be a bit fussy about the Australia's electronics magazine signal it expects; we didn’t have any trouble with any of the TVs or capture cards that we tried. The Converter mentions features such as “black/white level expansion, color transition improvement, dynamic range expansion”, so we wonder if it is not handling the twolevel monochrome image well. It may be better to produce a native HDMI signal rather than try to convert it. That could be done using one of our small computers that have an HDMI output, such as the RP2350B computer project from November 2025. It would just need software to play Pong. We found a BASIC version that seems promising, but we have not tested it: https://github.com/jmdeejay/ mmbasic-picomite/blob/main/games/ pong.bas Where to obtain VOC sensors? I have a query regarding the volatile organic chemical (VOC) sensor mentioned on page 45 of the February 2020 issue for the Indoor Air Quality Monitor (siliconchip.au/Article/12337). This MOX sensor worked very well. In the University lab where I worked previously, it notified our staff that we had a methanol leak (odourless but harmful), and also that a fume cupboard was malfunctioning (it used a three-phase motor with two of its poles inadvertently reversed, blowing down instead of up). In addition to these accomplishments, I used the ‘nose’ to estimate the range of VOCs in pharmaceutical products, which we tested on a gas chromatograph. There is a window in which to measure such a signal, thus the appropriate dilution was employed, and it was spot-on every time. However, both the CCS811 with onboard HDC1080 I have no longer give readings on both Micromite BackPacks. My guess is that the heaters have failed. Core Electronics has discontinued this line. Do you know of any other more reliable VOC sensors that are as good as that one? (G. A. D., PhD, Biochem). ● The sensor module is still available from sellers on AliExpress, see: www.aliexpress.com/w/wholesaleccs811-hdc1080.html w w w. a l i e x p r e s s . c o m / i t e m / SC 1005006603898777.html siliconchip.com.au