An illustrated online book on Hewlett-Packard equipment

A free 550 page e-book collects classic Hewlett-Packard test gear from the 1950s to the 1990s, with photos, schematics notes and restoration tips. Most of the instruments covered are ones the writer owns and tested.

Sections cover voltmeters, including the 400H vacuum tube voltmeter and the 410C with its photoconductive chopper amplifier, the 8640B signal generator, the 8015A pulse generator, the 54502A and 54540A oscilloscopes, the 5316B counter, the 141T spectrum analyzer with the 8553B and 8552B plug-ins, and the 8443A tracking generator.

Calculators get their own section: the HP-35, 45, 67 and 41C, plus the HP-85 computer. There is also a chapter on HP-IB, the interface bus better known as IEEE-488.

See more at k100.biz. (a large PDF)

Via Dave Jones on X.

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The Python on Microcontrollers Newsletter: subscribe for free

The Python for Microcontrollers Newsletter is the place for the latest news involving Python on hardware (microcontrollers AND single board computers like Raspberry Pi).

This ad-free, spam-free weekly email is filled with CircuitPython, MicroPython, and Python information that you may have missed, all in one place!

You get a summary of all the software, events, projects, and the latest hardware worldwide once a week, no ads! You can cancel anytime.

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The Python on Microcontrollers Newsletter: subscribe for free

The Python for Microcontrollers Newsletter is the place for the latest news involving Python on hardware (microcontrollers AND single board computers like Raspberry Pi).

This ad-free, spam-free weekly email is filled with CircuitPython, MicroPython, and Python information that you may have missed, all in one place!

You get a summary of all the software, events, projects, and the latest hardware worldwide once a week, no ads! You can cancel anytime.

It arrives about 11 am Monday (US Eastern time) with all the week’s happenings.

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The Python on Microcontrollers Newsletter: subscribe for free

The Python for Microcontrollers Newsletter is the place for the latest news involving Python on hardware (microcontrollers AND single board computers like Raspberry Pi).

This ad-free, spam-free weekly email is filled with CircuitPython, MicroPython, and Python information that you may have missed, all in one place!

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Eye of Sauron: long-range hidden spy camera detection and positioning with inbuilt memory EM radiation

Researchers from Hunan University, UC San Diego, and Michigan State University presented ESauron at USENIX Security ’24, a system that finds hidden spy cameras by listening for the electromagnetic radiation their memory gives off.

The idea rests on something every camera has to do. Raw images get encoded and compressed before they are sent anywhere or written to storage. That work happens in read-write memory, and the memory clock drives switching voltage regulator activity that varies with the workload. The result is EM radiation at the clock frequency.

When the scene in front of a camera changes, the encoder suddenly has more to do, and the EM signature jumps. ESauron triggers that on purpose by causing a scene change, then watches for the surge. Because it reads radiation and not network traffic, it works on wireless, wired, and offline cameras that record to a card.

Tested against 50 camera products, the prototype detected every one with 100% accuracy after four stimuli. Detection range passed 20 meters, including through obstructions, and the system located each camera.

See the video below and more on usenix.org.

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Observe El Niño with NASA

This visualization compares three ocean data products, sea surface temperature anomaly, apparent visible wavelength, and sea surface height anomaly, over the same months in 2025 and 2026. Signals of El Niño in each map are highlighted with pop-up labels. Credits: NASA’s Scientific Visualization Studio via NASA

Keep tabs on El Niño with NASA’s satellites.

A phenomenon rarer than a solar eclipse and more powerful than any single storm system is unfolding this fall, and NASA is tracking it closely.

El Niño is a natural climate pattern that emerges roughly every two to seven years marked by warmer-than-normal water temperatures in parts of the equatorial Pacific. NASA scientists are keeping watch as it flips trade winds, redistributes ocean heat, scrambles rain patterns, and raises sea surface height across parts of the Pacific./blockquote>

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The Python on Microcontrollers Newsletter: subscribe for free

The Python for Microcontrollers Newsletter is the place for the latest news involving Python on hardware (microcontrollers AND single board computers like Raspberry Pi).

This ad-free, spam-free weekly email is filled with CircuitPython, MicroPython, and Python information that you may have missed, all in one place!

You get a summary of all the software, events, projects, and the latest hardware worldwide once a week, no ads! You can cancel anytime.

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