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/

The average Hackaday user could probably piece together a rough model of a simple DC motor with what they’ve got kicking around the parts bin. We imagine some of you …read more (https://hackaday.com/2021/10/19/drone-and-high-voltage-spin-up-this-diy-corona-motor/)

The PinePhone Pro Is Here. But it’s Still Probably Not The Year Of Open-Source Linux On The Smartphone
https://hackaday.com/2021/10/19/the-pinephone-pro-is-here-but-its-still-probably-not-the-year-of-open-source-linux-on-the-smartphone/

A trope in open source commentary over the last decades has been the phrase “Is this the year of Linux on the desktop?”, as though the open source OS will …read more (https://hackaday.com/2021/10/19/the-pinephone-pro-is-here-but-its-still-probably-not-the-year-of-open-source-linux-on-the-smartphone/)

The Low-Down on Long-Wave: Unlicensed Experimental Radio
https://hackaday.com/2021/10/19/the-low-down-on-long-wave-unlicensed-experimental-radio/

In the 125 years since Marconi made his first radio transmissions, the spectrum has been divvied up into ranges and bands, most of which are reserved for governments and large …read more (https://hackaday.com/2021/10/19/the-low-down-on-long-wave-unlicensed-experimental-radio/)

The Quadrivium EnsembleBot Is A Labour Of Love
https://hackaday.com/2021/10/19/the-quadrivium-ensemblebot-is-a-labour-of-love/

https://hackaday.com/wp-content/uploads/2021/10/Snap-2021-10-10-at-22.29.25-rect.png
" data-image-caption="" data-medium-file="https://hackaday.com/wp-content/uploads/2021/10/Snap-2021-10-10-at-22.29.25-rect.png?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2021/10/Snap-2021-10-10-at-22.29.25-rect.png?w=800">The Quadrivium EnsembleBot project is a mashup between old school musical instruments and the modern MIDI controlled world. Built by a small team over several years, these hand crafted instruments …read more (https://hackaday.com/2021/10/19/the-quadrivium-ensemblebot-is-a-labour-of-love/)

VCF East Roars Back to Life
https://hackaday.com/2021/10/19/vcf-east-roars-back-to-life/

It didn’t take long to realize that the 2021 Vintage Computer Festival East — returning to the InfoAge Science and History Museum in Wall, New Jersey after being held virtually …read more (https://hackaday.com/2021/10/19/vcf-east-roars-back-to-life/)

Turning Old Masks into 3D Printer Filament
https://hackaday.com/2021/10/19/turning-old-masks-into-3d-printer-filament/