Silicon ChipProduct Showcase - February 2023 SILICON CHIP
  1. Outer Front Cover
  2. Contents
  3. Publisher's Letter: Ripping customers off through service & repair
  4. Feature: Computer Memory, Part 2 by Dr David Maddison
  5. Feature: Computer Memory Addendum by Nicholas Vinen
  6. Project: Active Mains Soft Starter, Part 1 by John Clarke
  7. Subscriptions
  8. Project: Advanced Test Tweezers, Part 1 by Tim Blythman
  9. Feature: A 30mm Spark-Gap Tesla Coil by Flavio Spedalieri
  10. PartShop
  11. Project: Active Subwoofer, Part 2 by Phil Prosser
  12. Product Showcase
  13. Feature: Heart Rate Sensor Module by Jim Rowe
  14. Project: Noughts & Crosses, Part 2 by Dr Hugo Holden
  15. Serviceman's Log: Nature abhors a vacuum, and so do I by Dave Thompson
  16. Vintage Radio: VE301Wn Dyn Volksemfanger by Ian Batty
  17. Market Centre
  18. Advertising Index
  19. Notes & Errata: Bass Block Subwoofer, January 2021; High-Performance Active Subwoofer, December 2022
  20. Outer Back Cover

This is only a preview of the February 2023 issue of Silicon Chip.

You can view 36 of the 112 pages in the full issue, including the advertisments.

For full access, purchase the issue for $10.00 or subscribe for access to the latest issues.

Articles in this series:
  • Computer Memory, Part 1 (January 2023)
  • Computer Memory, Part 1 (January 2023)
  • Computer Memory, Part 2 (February 2023)
  • Computer Memory Addendum (February 2023)
  • Computer Memory, Part 2 (February 2023)
  • Computer Memory Addendum (February 2023)
Articles in this series:
  • Computer Memory, Part 1 (January 2023)
  • Computer Memory, Part 1 (January 2023)
  • Computer Memory, Part 2 (February 2023)
  • Computer Memory Addendum (February 2023)
  • Computer Memory, Part 2 (February 2023)
  • Computer Memory Addendum (February 2023)
Items relevant to "Active Mains Soft Starter, Part 1":
  • Active Mains Soft Starter PCB [10110221] (AUD $10.00)
  • PIC12F617-I/P programmed for the Active Mains Soft Starter [1011022A.HEX] (Programmed Microcontroller, AUD $10.00)
  • Firmware for the Active Mains Soft Starter [1011022A] (Software, Free)
  • Active Mains Soft Starter PCB pattern (PDF download) [10110221] (Free)
  • Active Mains Soft Starter lid panel artwork (PDF download) (Free)
Articles in this series:
  • Active Mains Soft Starter, Part 1 (February 2023)
  • Active Mains Soft Starter, Part 1 (February 2023)
  • Active Mains Soft Starter, Part 2 (March 2023)
  • Active Mains Soft Starter, Part 2 (March 2023)
  • Active Mains Soft Starter (January 2024)
  • Active Mains Soft Starter (January 2024)
  • Active Mains Soft Starter (February 2024)
  • Active Mains Soft Starter (February 2024)
Items relevant to "Advanced Test Tweezers, Part 1":
  • Advanced/ESR Test Tweezers back panel PCB (blue) [04105242] (AUD $2.50)
  • Advanced SMD Test Tweezers PCB set [04106221+04106212 {blue}] (AUD $10.00)
  • PIC24FJ256GA702-I/SS programmed for the Advanced SMD Test Tweezers (0410622A.HEX) (Programmed Microcontroller, AUD $15.00)
  • 0.96in cyan OLED with SSD1306 controller (Component, AUD $10.00)
  • Advanced SMD Test Tweezers kit (Component, AUD $45.00)
  • Firmware for the Advanced SMD Test Tweezers [0410622A.HEX] (Software, Free)
  • Advanced SMD Test Tweezers PCB patterns (PDF download) [04106221+04106212] (Free)
  • Advanced SMD Test Tweezers sticker artwork (PDF download) (Panel Artwork, Free)
Articles in this series:
  • Advanced Test Tweezers, Part 1 (February 2023)
  • Advanced Test Tweezers, Part 1 (February 2023)
  • Advanced Test Tweezers, Part 2 (March 2023)
  • Advanced Test Tweezers, Part 2 (March 2023)
  • ADVANCED SMD TEST TWEEZERS (January 2024)
  • ADVANCED SMD TEST TWEEZERS (January 2024)
  • ADVANCED SMD TEST TWEEZERS (February 2024)
  • ADVANCED SMD TEST TWEEZERS (February 2024)
Items relevant to "Active Subwoofer, Part 2":
  • Active Monitor Speakers power supply PCB [01112221] (AUD $10.00)
  • Active Monitor Speakers cutting and assembly diagrams (Panel Artwork, Free)
  • Ultra-LD Mk.4 Amplifier PCB [01107151 RevC] (AUD $15.00)
  • Ultra-LD Mk3 200W Amplifier Module PCB [01107111] (AUD $15.00)
  • High-Performance Subwoofer amplifier bracket & heatsink diagrams (PDF download) (Panel Artwork, Free)
Articles in this series:
  • Active Monitor Speakers, Part 1 (November 2022)
  • Active Monitor Speakers, Part 1 (November 2022)
  • Active Monitor Speakers, Part 2 (December 2022)
  • Active Monitor Speakers, Part 2 (December 2022)
  • Active Subwoofer, Part 1 (January 2023)
  • Active Subwoofer, Part 1 (January 2023)
  • Active Subwoofer, Part 2 (February 2023)
  • Active Subwoofer, Part 2 (February 2023)
Items relevant to "Heart Rate Sensor Module":
  • Sample software for the Heart Rate Sensor Module (Free)
Articles in this series:
  • El Cheapo Modules From Asia - Part 1 (October 2016)
  • El Cheapo Modules From Asia - Part 1 (October 2016)
  • El Cheapo Modules From Asia - Part 2 (December 2016)
  • El Cheapo Modules From Asia - Part 2 (December 2016)
  • El Cheapo Modules From Asia - Part 3 (January 2017)
  • El Cheapo Modules From Asia - Part 3 (January 2017)
  • El Cheapo Modules from Asia - Part 4 (February 2017)
  • El Cheapo Modules from Asia - Part 4 (February 2017)
  • El Cheapo Modules, Part 5: LCD module with I²C (March 2017)
  • El Cheapo Modules, Part 5: LCD module with I²C (March 2017)
  • El Cheapo Modules, Part 6: Direct Digital Synthesiser (April 2017)
  • El Cheapo Modules, Part 6: Direct Digital Synthesiser (April 2017)
  • El Cheapo Modules, Part 7: LED Matrix displays (June 2017)
  • El Cheapo Modules, Part 7: LED Matrix displays (June 2017)
  • El Cheapo Modules: Li-ion & LiPo Chargers (August 2017)
  • El Cheapo Modules: Li-ion & LiPo Chargers (August 2017)
  • El Cheapo modules Part 9: AD9850 DDS module (September 2017)
  • El Cheapo modules Part 9: AD9850 DDS module (September 2017)
  • El Cheapo Modules Part 10: GPS receivers (October 2017)
  • El Cheapo Modules Part 10: GPS receivers (October 2017)
  • El Cheapo Modules 11: Pressure/Temperature Sensors (December 2017)
  • El Cheapo Modules 11: Pressure/Temperature Sensors (December 2017)
  • El Cheapo Modules 12: 2.4GHz Wireless Data Modules (January 2018)
  • El Cheapo Modules 12: 2.4GHz Wireless Data Modules (January 2018)
  • El Cheapo Modules 13: sensing motion and moisture (February 2018)
  • El Cheapo Modules 13: sensing motion and moisture (February 2018)
  • El Cheapo Modules 14: Logarithmic RF Detector (March 2018)
  • El Cheapo Modules 14: Logarithmic RF Detector (March 2018)
  • El Cheapo Modules 16: 35-4400MHz frequency generator (May 2018)
  • El Cheapo Modules 16: 35-4400MHz frequency generator (May 2018)
  • El Cheapo Modules 17: 4GHz digital attenuator (June 2018)
  • El Cheapo Modules 17: 4GHz digital attenuator (June 2018)
  • El Cheapo: 500MHz frequency counter and preamp (July 2018)
  • El Cheapo: 500MHz frequency counter and preamp (July 2018)
  • El Cheapo modules Part 19 – Arduino NFC Shield (September 2018)
  • El Cheapo modules Part 19 – Arduino NFC Shield (September 2018)
  • El cheapo modules, part 20: two tiny compass modules (November 2018)
  • El cheapo modules, part 20: two tiny compass modules (November 2018)
  • El cheapo modules, part 21: stamp-sized audio player (December 2018)
  • El cheapo modules, part 21: stamp-sized audio player (December 2018)
  • El Cheapo Modules 22: Stepper Motor Drivers (February 2019)
  • El Cheapo Modules 22: Stepper Motor Drivers (February 2019)
  • El Cheapo Modules 23: Galvanic Skin Response (March 2019)
  • El Cheapo Modules 23: Galvanic Skin Response (March 2019)
  • El Cheapo Modules: Class D amplifier modules (May 2019)
  • El Cheapo Modules: Class D amplifier modules (May 2019)
  • El Cheapo Modules: Long Range (LoRa) Transceivers (June 2019)
  • El Cheapo Modules: Long Range (LoRa) Transceivers (June 2019)
  • El Cheapo Modules: AD584 Precision Voltage References (July 2019)
  • El Cheapo Modules: AD584 Precision Voltage References (July 2019)
  • Three I-O Expanders to give you more control! (November 2019)
  • Three I-O Expanders to give you more control! (November 2019)
  • El Cheapo modules: “Intelligent” 8x8 RGB LED Matrix (January 2020)
  • El Cheapo modules: “Intelligent” 8x8 RGB LED Matrix (January 2020)
  • El Cheapo modules: 8-channel USB Logic Analyser (February 2020)
  • El Cheapo modules: 8-channel USB Logic Analyser (February 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules (May 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules (May 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules, Part 2 (June 2020)
  • New w-i-d-e-b-a-n-d RTL-SDR modules, Part 2 (June 2020)
  • El Cheapo Modules: Mini Digital Volt/Amp Panel Meters (December 2020)
  • El Cheapo Modules: Mini Digital Volt/Amp Panel Meters (December 2020)
  • El Cheapo Modules: Mini Digital AC Panel Meters (January 2021)
  • El Cheapo Modules: Mini Digital AC Panel Meters (January 2021)
  • El Cheapo Modules: LCR-T4 Digital Multi-Tester (February 2021)
  • El Cheapo Modules: LCR-T4 Digital Multi-Tester (February 2021)
  • El Cheapo Modules: USB-PD chargers (July 2021)
  • El Cheapo Modules: USB-PD chargers (July 2021)
  • El Cheapo Modules: USB-PD Triggers (August 2021)
  • El Cheapo Modules: USB-PD Triggers (August 2021)
  • El Cheapo Modules: 3.8GHz Digital Attenuator (October 2021)
  • El Cheapo Modules: 3.8GHz Digital Attenuator (October 2021)
  • El Cheapo Modules: 6GHz Digital Attenuator (November 2021)
  • El Cheapo Modules: 6GHz Digital Attenuator (November 2021)
  • El Cheapo Modules: 35MHz-4.4GHz Signal Generator (December 2021)
  • El Cheapo Modules: 35MHz-4.4GHz Signal Generator (December 2021)
  • El Cheapo Modules: LTDZ Spectrum Analyser (January 2022)
  • El Cheapo Modules: LTDZ Spectrum Analyser (January 2022)
  • Low-noise HF-UHF Amplifiers (February 2022)
  • Low-noise HF-UHF Amplifiers (February 2022)
  • A Gesture Recognition Module (March 2022)
  • A Gesture Recognition Module (March 2022)
  • Air Quality Sensors (May 2022)
  • Air Quality Sensors (May 2022)
  • MOS Air Quality Sensors (June 2022)
  • MOS Air Quality Sensors (June 2022)
  • PAS CO2 Air Quality Sensor (July 2022)
  • PAS CO2 Air Quality Sensor (July 2022)
  • Particulate Matter (PM) Sensors (November 2022)
  • Particulate Matter (PM) Sensors (November 2022)
  • Heart Rate Sensor Module (February 2023)
  • Heart Rate Sensor Module (February 2023)
  • UVM-30A UV Light Sensor (May 2023)
  • UVM-30A UV Light Sensor (May 2023)
  • VL6180X Rangefinding Module (July 2023)
  • VL6180X Rangefinding Module (July 2023)
  • pH Meter Module (September 2023)
  • pH Meter Module (September 2023)
  • 1.3in Monochrome OLED Display (October 2023)
  • 1.3in Monochrome OLED Display (October 2023)
  • 16-bit precision 4-input ADC (November 2023)
  • 16-bit precision 4-input ADC (November 2023)
  • 1-24V USB Power Supply (October 2024)
  • 1-24V USB Power Supply (October 2024)
  • 14-segment, 4-digit LED Display Modules (November 2024)
  • 0.91-inch OLED Screen (November 2024)
  • 0.91-inch OLED Screen (November 2024)
  • 14-segment, 4-digit LED Display Modules (November 2024)
  • The Quason VL6180X laser rangefinder module (January 2025)
  • TCS230 Colour Sensor (January 2025)
  • The Quason VL6180X laser rangefinder module (January 2025)
  • TCS230 Colour Sensor (January 2025)
  • Using Electronic Modules: 1-24V Adjustable USB Power Supply (February 2025)
  • Using Electronic Modules: 1-24V Adjustable USB Power Supply (February 2025)
Items relevant to "Noughts & Crosses, Part 2":
  • Static Noughts & Crosses Computer game board PCB [08111221] (AUD $12.50)
  • Static Noughts & Crosses Computer compute board PCB [08111222] (AUD $12.50)
  • W27C020-70 EEPROM programmed for the Static Noughts & Crosses Computer [0811122A.bin] (Programmed Microcontroller, AUD $10.00)
  • EEPROM data for the Static Noughts & Crosses Computer (0811122A.bin) (Software, Free)
  • Static Noughts & Crosses Computer case details (PDF download) (Panel Artwork, Free)
Articles in this series:
  • Noughts & Crosses Machine, Pt1 (January 2023)
  • Noughts & Crosses Machine, Pt1 (January 2023)
  • Noughts & Crosses, Part 2 (February 2023)
  • Noughts & Crosses, Part 2 (February 2023)

Purchase a printed copy of this issue for $11.50.

PRODUCT SHOWCASE ams OSRAM LED devices for automotive exterior lighting Mouser Electronics is now stocking the OSLON Black Flat X LED devices from ams OSRAM. Designed for forward lighting applications, including headlamps, night vision, and laser devices, the OSLON LED devices offer high efficiency and excellent thermal conditions. The OSLON Black Flat X LED series of devices have a high focus on system cost, making them a durable, cost-­ effective option for a wide range of lighting solutions. The 3-chip version (KW3 HNL631. TK LEDs) is a high-­performance LED offering 1350 lumens at 1A. They deliver exceptional thermal performance, allowing for smaller heatsinks. They have an extremely high contrast 1:200 design as a result of black case material and TiO2 casting. The 4-chip version (KW4 HPL631. TK) is an ideal replacement for halogen lamps. Offering up to 2115lm at 1A, they are suitable for a range of automotive functions, including headlamps and low-beam and highbeam applications. The devices are housed in a 7.59mm × 3.75mm × 0.5mm package. The 5-chip version (KW5 HQL631. TK) is the most efficient lead-frame device in the OSLON series, delivering exceptional performance in automotive exterior applications, including halogen replacement. The high-­ efficiency LEDs offer up to 2140lm at 1A, and boast an operating temperature range of -40°C to +135°C. To learn more about the ams OSRAM Black Flat X LED devices, visit siliconchip.au/link/abj2 Mouser Electronics Inc. 1000 North Main St, Mansfield TX 76063 USA Phone: (852) 3756 4700 www.mouser.com The results from element14’s Women in Engineering survey element14 launched the second annual Global Women in Engineering survey in June 2022 to help shed light on women’s experiences, career paths, wider challenges and opportunities in the engineering/electronics industry. The global survey is designed to gain direct insight from all members of the industry to understand current barriers to achieving equality and how to diminish discriminatory practices in the workforce. Key insights from the survey included: • 70% of survey respondents said they would intervene when seeing discrimination. However, the seniority of the person exhibiting discriminating behaviour was cited as the biggest obstacle to intervention. A small percentage believed they would not intervene because it is part of their company’s culture. • Women expressed the belief that they were perceived to be less technically capable than men, but this view was not supported by male respondents. • Men cited that woman “missing out on career development opportunities” was an issue. • 25% of survey respondents said they have never experienced sexism in the industry. • Other discrimination challenges cited some women as obstructing other 70 Silicon Chip women in their career progression, although the barrier was not as great as that presented by men. Self-­promotion by women was highlighted as a key issue in this year’s survey. • Genders think similarly about how to address work/life balance. With regards to pay 12% of men are less likely to say they have seen pay differentials, compared to over 40% of female respondents. • Views were similar on the enforcement of policies. However, there was an overall decrease in enthusiasm for inclusion and diversity initiatives. • More than half of the respondents said providing mentorship and development opportunities to women was important. More than 75% of women felt mentorship helped them in their careers. element14’s eight-week global survey was open to everyone working in the electronics/engineering industry. 75% of this year’s survey respondents were from Europe and North America. There was an even distribution of ages, particularly from 25 to 54 years old (at 74%), and 57% of respondents had more than 10 years of experience. element14 72 Ferndell Street, Chester Hill NSW 2162 Phone: 1300 361 005 https://au.element14.com/ Drop-in replacement for crystal oscillators Directly replace traditional quartz crystal oscillators in your most challenging designs with our robust, high-performance DSC1500 family of MEMS oscillators. The DSC1500 family delivers reliability and ruggedness in a small form factor that is ideal for industrial and portable applications. As a direct drop-in replacement for crystal oscillators, these devices also offer excellent jitter and stability with substantially lower power consumption. The DSC1500 family of MEMS Australia's electronics magazine oscillators strikes a unique balance of jitter performance, size and power consumption: 1ps RMS phase jitter with 20mW of power in a 2.0 × 1.6 millimetre package. You can download the DCS1500 data sheet from siliconchip.au/link/ abj1 Microchip Technology Australia Suite 32, 41 Rawson Street, Epping NSW 2121 Phone: (02) 9868 6733 www.microchip.com siliconchip.com.au