They Milk Cows, Don’t They?
https://hackaday.com/2021/10/18/they-milk-cows-dont-they/

You’ve no doubt heard of the many alternatives to cow’s milk that are available these days. Perhaps you’ve even tried a few of them in your quest to avoid lactose. …read more (https://hackaday.com/2021/10/18/they-milk-cows-dont-they/)

The HP3458A: King of Multimeters for Three Decades
https://hackaday.com/2021/10/18/the-hp3458a-king-of-multimeters-for-three-decades/

[Marco] looks at a lot of meters. However, he considers the HP3458A the best even though they were introduced more than 30 years earlier in 1989. Someone donated one to …read more (https://hackaday.com/2021/10/18/the-hp3458a-king-of-multimeters-for-three-decades/)

Build a Dog Ball Launcher That Kinda Looks Like a Dog
https://hackaday.com/2021/10/18/build-a-dog-ball-launcher-that-kinda-looks-like-a-dog/

The average garden dog will play fetch long beyond the average human’s endurance. If you want to keep your dog exercised without hurting your pitching arm, [brankly’s] automatic dog ball …read more (https://hackaday.com/2021/10/18/build-a-dog-ball-launcher-that-kinda-looks-like-a-dog/)

Laser Pointer and Arduino Make a Minimalistic Shooting Game
https://hackaday.com/2021/10/18/laser-pointer-and-arduino-make-a-minimalistic-shooting-game/

Video games are great and all, but sometimes you just want the thrill of manipulating actual objects in addition to watching action on a screen. This must have been the …read more (https://hackaday.com/2021/10/18/laser-pointer-and-arduino-make-a-minimalistic-shooting-game/)

A Microwave Frequency Doubler
https://hackaday.com/2021/10/18/a-microwave-frequency-doubler/

It is an age-old problem. You have a 2.5 GHz source and you want it at 5 GHz. You need a frequency doubler. [All Electronics Channel] has an interesting video …read more (https://hackaday.com/2021/10/18/a-microwave-frequency-doubler/)

POLF: Retro 3D Game Uses Only a Character Display
https://hackaday.com/2021/10/18/polf-retro-3d-game-uses-only-a-character-display/

Got a retrocomputing itch? So does [David Given], and luckily for us all he indulged it by writing POLF: a first-person 3D game for the Commodore PET that uses only …read more (https://hackaday.com/2021/10/18/polf-retro-3d-game-uses-only-a-character-display/)

Drone and High Voltage Spin Up This DIY Corona Motor
https://hackaday.com/2021/10/19/drone-and-high-voltage-spin-up-this-diy-corona-motor/