The Amp Hour Electronics Podcast

Dave found a wrist mounted DMM that looks…inadvisable We’ll discuss the survey results next time! Florin Cocos of VoltLog Great Scott Sam Aldaher on the show last week Gerald Undone did a studio tour with Captain Disillusionment Short videos Dave using a go-pro on a bike Separate gyro file to stabilize D-y hybrid inverter Chart Remote shell Cline Chris is finally getting solar open energy monitor Emporia vue Sense We talked with Joe Bamberg when he worked there Driving back from canberra Ben Krasnow makin’ magnets! Bluetooth videos

Sam Aldhaher, a power electronics engineer and 3D graphics designer, shares his passion for blending art with engineering. They discuss how Blender enables the visualization of complex electronics concepts, transforming static designs into engaging 3D models. Sam dives into his journey from CAD to 3D, the accessibility of affordable tools like Electromagnodes, and the importance of realistic visualizations for education. He also touches on the challenges of simulating electromagnetic behavior and discusses innovations in wireless technology.

We are doing a 2025 listener survey! Answer the survey and put in your email to win one of three Jumperless OG units donated by Kevin Cappuccio (past guest of the show). Last day to input is June 1st. This episode was recorded Monday the 12th, which has implications on discussions. Dave recently returned from Melbourne for Dave’s recent visit to Electronex. Dave saw past guest Scott Williams there (he has been interviewed by both Dave and Chris). Scott’s company Xentronics is also a Golioth partner They discussed service providers in the electronics industry at including turnkey solutions (concept to production and marketing) versus services only (firmware, PCB layout, CAD). The choice of show for a service provider might depend on the customer vertical (e.g., medical expo for medical device design). Farmers are described as rough clients due to being cost-constrained, needing durable solutions for harsh environments, and being unforgiving of downtime. The Australian Manufacturing Week was unexpectedly enormous, dwarfing the electronics show in scale and attendance, with lines up to 40 minutes long just to get in. The manufacturing show featured “Heavy Metal” manufacturing, like laser cutters, sheet metal benders, and giant machines cutting thick steel, which Dave found more exciting than the electronics demos. They discussed the scale of manufacturing equipment, comparing it to shows like IMTS in Chicago with multi-story machining centers and machines weighing hundreds of tons. Australia manufactures things like steel, large steel structures (bridges), and large custom parts like excavator scoops. Dave is conducting environmental air quality tests in his office, measuring formaldehyde, CO2, and other factors. He has to run his air conditioning for one of the test conditions. The environmental monitor measures temperature, pressure, humidity, VOCs, noise, carbon dioxide, formaldehyde, PM2.5 particulate matter, and radiation. The radiation sensor uses a tube requiring 381 volts. XKCD graphic showing relative radiation Dave observes large formaldehyde spikes every time he opens his door, which go down within about 10 minutes. His CO2 levels are typically 800-900 ppm. The AC unit cycling is visible in the humidity measurements. Chris asks about the availability of affordable VOC sensors now. Dave believes his monitor uses a common sensor like the BME680. Chris explains that the availability of affordable VOC sensors is linked to FEMA trailers after Hurricane Katrina, where high formaldehyde levels caused illness, leading to regulations and subsequently more affordable sensors. Modern VOC sensors often measure gas resistivity in ohms. Some PM2.5 sensors use a fan and a laser to detect particles. Dave saw small desktop lathes at the manufacturing show and was tempted to buy one for $800. Chris explains the difference between a mill and a lathe. Potential uses for a lathe are discussed, including making knobs. Chris advises against buying a personal machining tool like a lathe or mill unless you need parts immediately, suggesting using online services instead, as getting $800 of value from occasional use is difficult. Dave jokingly suggests a lathe might be useful for “zombie apocalypse manufacturing”, or more darkly, for making gun barrels. Chris mentions his past experience with a mill, which he traded for a 3D printer kit. He now prefers “it just works” solutions. They discuss receiving free 3D resin printers and the difficulty of finding uses for them unless you are already skilled in 3D modeling. Discussion shifts to the recent drop in tariffs between China and the US. Dave believes this will lead to lots of manufacturing coming back to the US, citing announcements from car companies and others (but providing no sources). Chris found this CBS article after the fact, but it’s light on details. NPR covered how tariffs are impacting Digikey and Thief River Falls Chris is skeptical that the tariff drops or initiatives like the CHIPS Act will cause significant, long-term shifts in the global supply chain, especially for components like capacitors or packaged semiconductors. The complexities of building fabs and the long lead times are mentioned in relation to the CHIPS Act. Chris recommends a YouTube channel about shipping and logistics and mentions MarineTraffic.com for tracking live global shipping data. Dave mentions issues with Bluetooth data dropouts and incorrect values on a new Brymen BM787 multimeter. Dave recently made a video about Test Controller, a free Java-based program that automates hundreds of test instruments (multimeters, power supplies, loads) via serial interfaces. It allows scripting and custom driver creation. Dave considers using Test Controller and multiple instruments with his microscope PC for overlaying data on video. Chris introduces the concept of “vibe coding,” which means letting AI do the coding. You act as a product manager providing requirements and feedback. Dave has used AI for coding before and is interested in using it for his next project due to infrequent coding leading to needing to relearn tools. He suggests using it for a simple timer project, especially for annoying tasks like generating fonts. Chris is using AI for a location-sharing web app prototype for a meetup. He describes the experience of watching the AI modify files and interact with tools as “trippy”. He uses “Claude credits” for this. They discuss AI as a new tool. Chris expresses concern about how students learning to code today will develop troubleshooting skills if AI does much of the basic work. Dave received a new piece of high-end test equipment: a Microtest Impedance Analyzer (model 6632). This is distinct from an LCR meter and can measure the entire frequency impedance sweep up to 10 MHz (for the model received). The impedance analyzer can be used to characterize components like PCB inductors, assess bypass capacitor performance on boards, or measure materials like piezoelectric substrates. It can also show admittance circles and DC bias characteristics. Chris mentioned that past guest Carl Bugeja would benefit from a tool like the impedance analyzer Dave notes the impedance analyzer is very specific and requires special fixturing. It supports open, short, and load compensation. Dave also recently received a heavy GW Instek AC power source, which can be used for power line simulation (adding spikes, dropouts, etc.) to test products. Trying out generating show notes using NotebookLM from Google. We’d love your feedback in the comments.

In this conversation, Colin O’Flynn, a researcher at Dalhousie University and New AE Technology, dives into the world of small-scale electronics manufacturing. He discusses the intricacies of side-channel attacks and innovative security measures, like the OpenTitan project. Colin also shares insights on the challenges posed by the pandemic, the dynamics of local manufacturing, and his experiences with pick-and-place technology. Additionally, he highlights the impact of AI in education and hints at his upcoming book on small-scale production, perfect for tech enthusiasts!

We are doing a 2025 listener survey! Answer the survey and put in your email to win one of three Jumperless OG units donated by Kevin Cappuccio (past guest of the show) Note: this was corrected from the original, these are not v5 units, they are the original Jumperless units. Apologies for the confusion ~CG Chris signed on to get solar installed He’ll be taking advantage of Duke Energy’s PowerPair, a program to get a bulk amount for the battery and ongoing payments to act as a virtual power plant. Telsa Powerwall 3 Teardown Australian politicians are proposing money for batteries for everyone in Australia Peter Walkinson batteries CATL batteries Back powering off a Chevy Bolt AC battery power Peaker plant Check out the rates for peak power in New South Wales (high!) Base load Chris is working on a new series for tiny hardware nRF52840 With careful planning, it’s possible to get a “0.4 mm pitch” (found out it’s actually 0.35 mm!) onto the JLC 6 layer process because they now allow via in pad. Jumperless v5 episode (though as a reminder, we’re giving away the OG versions, not the v5) Dave review of Jumperless (mailbag video) We are doing a 2025 listener survey and added some new questions Slow trigger  R&S version  Laminated cheat sheet Jeff Geerling Bosch video  The Tariffs in the US are an absolute mess. Since recording they have been downgraded, but they are definitely still going to have some outsized influece on the electronics world. Chris thinks that it makes more sense to race to the bottom of available parts (like the new $0.10 CH572 with Bluetooth), pay the tariff, and put in more time and effort on the software. Not that Chris is the intended audience, but also that it’s not going to have the effect that is Ghostbusters song

In this enlightening discussion, Michael Gielda, co-founder of Antmicro and an advocate for open-source projects, dives into the world of system design and simulation. He highlights the significance of the Zephyr operating system and Renode as powerful tools for hardware development. The conversation explores innovative applications of simulation technology in automotive and space industries, and the importance of validating real-world outcomes. Michael also discusses advancements in anomaly detection and machine learning, shedding light on how open-source solutions are transforming hardware testing.

The hosts hilariously tackle the frustrations of rising costs on a popular meetup platform while diving into the quirks of battery technology and leakage issues. They share insights on continuity testers and the ambitious design of an AirTag clone. Audio sensor technologies take center stage, especially clap-activated devices. Nostalgia hits as they reflect on learning oscilloscopes pre-internet, and then tackle flickering home lights, mixing practical troubleshooting tips with electrical insights. Expect unexpected laughs and tech wisdom!

Join Kevin Cappucio, the innovative creator of the Jumperless Breadboard, as he dives into the future of prototyping. He shares the evolution and standout features of his unique breadboard design, which integrates electronics without traditional jumpers. Discover the manufacturing intricacies and technical challenges faced during development. Kevin also discusses enhancements in circuit-building, like advanced routing algorithms and the significance of resistor and capacitance management in projects, making it a must-listen for electronics enthusiasts!

The conversation features amusing anecdotes on the nostalgic allure of Tandy computers and the resurgence of Pebble watches post-Google. Insights on tracking test equipment and the challenges of adopting solar energy solutions add depth. There's a light-hearted take on the quirks of modern payment systems and humorous reflections on collecting versus hoarding electronics. The hosts also dive into the intricate world of 3D CAD design, showcasing their creative struggles and the community's feedback.

Join James Adams, CTO of Hardware at Raspberry Pi, alongside engineers Luke Wren and Liam Fraser, along with Chris Boross from the commercial team. They discuss the new RP2350 microcontroller, highlighting its dual-core architecture and security features. The conversation delves into innovative applications like satellite technology and motor control. They also touch on power management, memory vulnerabilities, and the importance of testing for security. Expect insights on chip design complexities and the exciting future of microcontrollers!