2025 One Hertz Challenge: Op-Amp Madness
https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/

Sometimes, there are too many choices in this world. My benchtop function generator can output a sine, square, or saw wave anywhere from 0.01 Hz up to 60 MHz? Way …read more (https://hackaday.com/2025/07/31/2025-one-hertz-challenge-op-amp-madness/)

Double the Sensors, Double the Fun, with 2-in-1 Panoramic Camera
https://hackaday.com/2025/07/31/double-the-sensors-double-the-fun-with-2-in-1-panoramic-camera/

When film all came in rolls, it was fairly easy to play with the frame of the image. Companies like Hasselblad (and many others) made camera backs that would expose …read more (https://hackaday.com/2025/07/31/double-the-sensors-double-the-fun-with-2-in-1-panoramic-camera/)

2025 One Hertz Challenge: 4-Function Frequency Counter
https://hackaday.com/2025/07/31/2025-one-hertz-challenge-4-function-frequency-counter/

Frequency! It’s an important thing to measure, which is why [Jacques Pelletier] built a frequency counter some time ago. The four-function unit is humble, capable, and also an entry into …read more (https://hackaday.com/2025/07/31/2025-one-hertz-challenge-4-function-frequency-counter/)

Railway Time: Why France’s Railways Ran Five Minutes Behind
https://hackaday.com/2025/07/31/railway-time-why-frances-railways-ran-five-minutes-behind/

With us chafing at time zones and daylight saving time (DST) these days, it can be easy to forget how much more confusing things were in the late 19th century. …read more (https://hackaday.com/2025/07/31/railway-time-why-frances-railways-ran-five-minutes-behind/)

Raspberry Pi RP2350 A4 Stepping Addresses E9 Current Leakage Bug
https://hackaday.com/2025/07/31/raspberry-pi-rp2350-a4-stepping-addresses-e9-current-leakage-bug/

When Raspberry Pi’s new RP2350 MCU was released in 2024, it had a slight issue in that its GPIO pins would leak a significant amount of current when a pin …read more (https://hackaday.com/2025/07/31/raspberry-pi-rp2350-a4-stepping-addresses-e9-current-leakage-bug/)

DIY MP3 Player Inspired By The iPod
https://hackaday.com/2025/08/01/diy-mp3-player-inspired-by-the-ipod/

These days, the personal MP3 player has been largely replaced by the the smartphone. However, [Justinas Petkauskas] still appreciates the iPod for its tactility and portability, and wanted to bring …read more (https://hackaday.com/2025/08/01/diy-mp3-player-inspired-by-the-ipod/)

Turning Waste Plastic into Spools of Filament
https://hackaday.com/2025/08/01/turning-waste-plastic-into-spools-of-filament/