In the early days, PNP bipolar transistors were common, but the bulk of circuits you see today use NPN transistors. As [Aaron Danner] points out, many people think PNP transistors …read more (https://hackaday.com/2024/07/21/all-about-pnp-transistors/)

Welding Wood Is As Simple as Rubbing Two Sticks Together
https://hackaday.com/2024/07/21/welding-wood-is-as-simple-as-rubbing-two-sticks-together/

Can you weld wood? It seems like a silly question — if you throw a couple of pieces of oak on the welding table and whip out the TIG torch, …read more (https://hackaday.com/2024/07/21/welding-wood-is-as-simple-as-rubbing-two-sticks-together/)

Ask Hackaday: Should We Teach BASIC?
https://hackaday.com/2024/07/21/ask-hackaday-should-we-teach-basic/

Suppose you decide you want to become a novelist. You enroll in the Hackaday Famous Novelists School where your instructor announces that since all truly great novels are written in …read more (https://hackaday.com/2024/07/21/ask-hackaday-should-we-teach-basic/)

Powering Biology with Batteries
https://hackaday.com/2024/07/21/powering-biology-with-batteries/

We’ve all been there — you forgot your lunch, but there are AC outlets galore. Wouldn’t it be so much simpler if you could just plug in like your phone? …read more (https://hackaday.com/2024/07/21/powering-biology-with-batteries/)

A Modchip for a Fridge
https://hackaday.com/2024/07/21/a-modchip-for-a-fridge/

An annoying fridge that beeps incessantly when the door is open too long should be an easy enough thing to fix by disconnecting the speaker, but when as with [kennedn]’s …read more (https://hackaday.com/2024/07/21/a-modchip-for-a-fridge/)

Hackaday Links: July 21, 2024
https://hackaday.com/2024/07/21/hackaday-links-july-21-2024/

When monitors around the world display a “Blue Screen of Death” and you know it’s probably your fault, it’s got to be a terrible, horrible, no good, very bad day …read more (https://hackaday.com/2024/07/21/hackaday-links-july-21-2024/)

CeraMetal Lets You Print Metal, Cheaply and Easily
https://hackaday.com/2024/07/21/cerametal-lets-you-print-metal-cheaply-and-easily/

3D printing metal has been somewhat of a holy grail for the last decade in the hobby 3DP scene. We’ve seen a number of solutions, including using expensive filaments that …read more (https://hackaday.com/2024/07/21/cerametal-lets-you-print-metal-cheaply-and-easily/)

Coax Stub Filters Demystified
https://hackaday.com/2024/07/21/coax-stub-filters-demystified/