For those willing to put some elbow grease into it, there is an almost unlimited supply of 18650 lithium ion batteries around for cheap (or free) just waiting to be …read more (https://hackaday.com/2024/05/27/connecting-and-using-high-capacity-batteries-in-parallel/)

Recycling of Portland Cement and Steel in Electric Arc Furnaces
https://hackaday.com/2024/05/27/recycling-of-portland-cement-and-steel-in-electric-arc-furnaces/

The use of concrete and steel have both become the bedrock of modern-day construction, which of course also means that there is a lot of both which ends up as …read more (https://hackaday.com/2024/05/27/recycling-of-portland-cement-and-steel-in-electric-arc-furnaces/)

An Improved Spectrometer, No Lasers Required
https://hackaday.com/2024/05/27/an-improved-spectrometer-no-lasers-required/

Here at Hackaday, we love it when someone picks up the ball from a previous project and runs with it. That’s what we’re all about, really — putting out cool …read more (https://hackaday.com/2024/05/27/an-improved-spectrometer-no-lasers-required/)

Adafruit Badges Turned Electronic Invitations
https://hackaday.com/2024/05/28/adafruit-badges-turned-electronic-invitations/

Despite what you might have heard, even the most devout Hackaday readers may eventually find themselves getting married. Should you ever find yourself in a situation where you need to …read more (https://hackaday.com/2024/05/28/adafruit-badges-turned-electronic-invitations/)

Feast Your Eyes on These AI-Generated Sounds
https://hackaday.com/2024/05/28/feast-your-eyes-on-these-ai-generated-sounds/

The radio hackers in the audience will be familiar with a spectrogram display, but for the uninitiated, it’s basically a visual representation of how a range of frequencies are changing …read more (https://hackaday.com/2024/05/28/feast-your-eyes-on-these-ai-generated-sounds/)

The Tragic Story Of The Ill-Fated Supergun
https://hackaday.com/2024/05/28/the-tragic-story-of-the-ill-fated-supergun/

In the annals of ambitious engineering projects, few have captured the imagination and courted controversy quite like Gerald Bull’s Supergun. Bull, a Canadian artillery expert, envisioned a gun that could …read more (https://hackaday.com/2024/05/28/the-tragic-story-of-the-ill-fated-supergun/)

Rotary Phone Lives on as Arduino Kitchen Timer
https://hackaday.com/2024/05/28/rotary-phone-lives-on-as-arduino-kitchen-timer/

It’s safe to say that few people still use rotary phones on a daily basis. Hell, most of us don’t even use landline telephones anymore. But just because these classic …read more (https://hackaday.com/2024/05/28/rotary-phone-lives-on-as-arduino-kitchen-timer/)

Keebin’ with Kristina: The One with the Auto Harp Typewriter
https://hackaday.com/2024/05/28/keebin-with-kristina-the-one-with-the-auto-harp-typewriter/