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The Amp Hour: Daily Summaries Delivered
by The Amp Hour (Chris Gammell and David L Jones)
The Amp Hour is a weekly conversation about electronics and the people who design them.
Latest Episodes
The most recent episodes — sign up to get AI-powered summaries of each one.
- 1 weeks ago1h 3m
The Onio Batteryless Vision with Kjetil Meisal
Kjetil Meisal, CEO and co-founder of Norwegian semiconductor startup ONiO, joins Chris to discuss the development of ONiO.zero, a revolutionary batteryless microcontroller powered entirely by ambient energy harvesting.
- 2 weeks ago1h 5m
The Walmart Greeter of Electronics
Dave and Chris catch up on the shift toward practical hands-on engineering education at universities, open-source robotics, calculator forensics, mentoring young engineers, AI-assisted PCB layout tools, reverse-engineering scope RF sections, and why Chris wants to be “the Walmart greeter of electronics,”
- 3 weeks ago1h 6m
Perpetual Wearable Biosensing with Andy Kong
Andy Kong is creating Chargerless, a pre-seed wearable biometric device that runs on 1 minute of sunshine per day. He joins Chris to talk about low power design, unconventional power schemes, the weird signals of the human body, and more.
- Aug 26, 202658 min
Hands-on Physical AI with Kevin Cloutier
Kevin Cloutier is the North American Lead for Physical AI at a global engineering consulting firm and a computer engineer who is passionate about taking complex computations to the edge. He joins Chris to discuss the transition from legacy, statically programmed factory robotics to modern, imitation-learning-based “Physical AI,” building and calibrating the affordable $200 3D-printed SO101 robot arm using the LeRobot open-source framework or Intel’s Physical AI Studio, and orchestrating complex robotic systems entirely on local edge hardware.
- Aug 19, 20261h 22m
E&M Reality Emerges with Robert Fennis
Robert Fennis joins Chris to demystify the black magic of RF and talk about his open-source, Python-based 3D electromagnetic solver, EMerge. They discuss why simulation is like building a pyramid of knowledge, how silk screen can completely de-tune a patch antenna, and Robert’s quest to build the “IKEA of FEM solvers” so hardware developers everywhere can simulate their designs without relying on insanely expensive proprietary software.
- Aug 5, 202655 min
The Focus Knob Works
Dave and Chris celebrate 16 years of the show (1st episode was August 10th, 2010) by launching a brand-new static website featuring searchable transcripts and a “pissed-old amber” SVG scope with a working focus knob–and links to merch!. They also discuss Dave’s new employee, 10 cent RISC-V debuggers, and why naming your startup after an un-Googleable Australian cryptid is a bad move
- Jul 22, 20261h 20m
The Terahertz Frontier with Greg Charvat of Teradar
Dr Greg Charvat, CTO and co-founder of Teradar, joins Chris for a 5th appearance on The Amp Hour to talk about how terahertz frequency radar will revolutionize the automotive space and far outstrips the capabilities of LIDAR and Blobbology
- Jul 9, 20261h 6m
#728 – Space Age Bluetooth with Alex Haro
Welcome Alex Haro, CEO of Hubble Chris welcomes Alex Haro, co-founder and CEO of Hubble, to discuss the ambitious task of connecting billions of Bluetooth devices directly to space The “banner level spec”: Hubble enables any off-the-shelf Bluetooth chip to communicate with low Earth orbit satellites using a software-only firmware update Alex describes the system as a global “Find My” for enterprise that also handles sensor readings and arbitrary data Addressing the “Bluetooth in space” skepticism: Alex explains that while the standard is optimized for high-fidelity audio, the chips can be repurposed to emit a custom software-defined waveform in the 2.4 GHz band The true innovation is on the satellite side: massive antenna arrays with thousands of elements perform advanced digital beamforming to pick up weak signals (0-20 dBm) from hundreds of kilometers away The “Dinner Table Analogy”: Traditional networks “yell” to be heard, but Hubble has the device talk slower (lower bit rate) and enunciate (error correction) while the satellite uses thousands of “microphones” to isolate a single voice Why Bluetooth instead of LoRa? Hubble co-founder and CTO of Ben Wild, is the architect of Amazon Sidewalk. He chose Bluetooth because it is globally ubiquitous and the 2.4 GHz band is unlicensed worldwide Technical trade-off: While LoRa uses spread spectrum chirps, 2.4 GHz allows for much smaller antenna arrays on the satellites compared to the 900 MHz band The hybrid network approach: Devices use the same SDK to communicate via a crowdsourced terrestrial network (apps and gateways) or directly to satellites when out of range Constellation roadmap: Hubble currently has four production satellites in orbit (covering the globe twice daily) and aims for 64 satellites by 2029 for continuous real-time coverage Removing the GPS chip: By using Angle of Arrival (AoA) on the satellite, Hubble can determine a device’s location to within tens of meters, reducing BOM costs and power consumption Future “Reverse GPS”: Once multiple satellites are overhead, Hubble can combine AoA with Time of Flight (ToF) measurements for even higher accuracy Network capacity: Each 10km satellite beam can handle roughly 100,000 simultaneous devices before hitting saturation, with terrestrial gateways offloading density in major metros Dealing with the “grumpy engineer”: Alex discusses lowering friction for developers by investing in the Zephyr Project and partnering with Texas Instruments to pre-flash the Hubble stack on Bluetooth SOCs Stack coexistence: The Hubble SDK allows the radio to time-slice, maintaining a standard Bluetooth connection to a phone while sending satellite packets during idle periods Payload specs: Data packets are 13 bytes, transmitted at 400 bits per second Business model: Pricing starts around $2 per device per month and scales down with volume to hit the “price elasticity” needed for tracking billions of assets Enterprise use cases: From tracking shipping pallets to monitor loss, to cold chain monitoring for pharmaceuticals and agriculture The SpaceX experience: Alex describes the “visceral” feeling of the double sonic booms from the Falcon 9 landing during their launch party Find out more at hubble.com (or hub of BLE)
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About The Amp Hour
The Amp Hour is a weekly conversation about electronics and the people who design them.
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