How to Use That Slide Rule
<img width="800" height="320" src="![image](https://hackaday.com/wp-content/uploads/2025/11/rule.png?w=800")
alt=""/>You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use 
alt=""/>You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use Hackaday
How To Use That Slide Rule
You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how t...
Hackaday
How To Use That Slide Rule
You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how t...
![image](https://hackaday.com/wp-content/uploads/2025/11/Useful-KiCad-banner.jpg?w=800")
alt="Schematic of a voltage divider"/>[Andrew Greenberg] has some specific ideas for how open-source hardware hackers could do a better job with their KiCad schematics. In his work with students at Portland State University, [Andrew] 
![image](https://hackaday.com/wp-content/uploads/2025/11/layout-wiring-featured.jpg?w=800")
alt=""/>For those of you who haven’t spent time in North America around this time of year, you may be unaware of two things: one, the obligatory non-stop loop of “All 
![image](https://hackaday.com/wp-content/uploads/2025/11/GREY-C64-shooter-feat.jpg?w=800")
alt=""/>When people talk about the lack of a DOOM being the doom Commodore home computers, they aren’t talking about the C64, which was deep into obsolescence when demon-slaying suddenly became 
![image](https://hackaday.com/wp-content/uploads/2016/05/microphone.jpg?w=800")
alt=""/>Wait, what? Is it time for the podcast again? Seems like only yesterday that Dan joined Elliot for the weekly rundown of the choicest hacks for the last 1/52 of 
![image](https://hackaday.com/wp-content/uploads/2025/11/sleep-sculpture-800.jpg?w=800")
alt="A circuit sculpture designed to help you sleep."/>Have trouble sleeping, or getting to sleep in the first place? You’ve no doubt heard of white noise machines, but know it would be much cooler to make your own. 
![image](https://hackaday.com/wp-content/uploads/2016/01/darkarts.jpg?w=800")
alt=""/>You may have noticed that large pieces of the Internet were down on Tuesday. It was a problem at Cloudflare, and for once, it wasn’t DNS. This time it was 
![image](https://hackaday.com/wp-content/uploads/2025/11/xbmc-featured.jpg?w=800")
alt=""/>The original Xbox was different from the consoles that had gone before, in that its hardware shared much with a PC of the day. It was found to be hackable, 
![image](https://hackaday.com/wp-content/uploads/2025/11/airtoilet_feat.jpg?w=800")
alt=""/>Have you ever wondered what goes into making it possible to use the restroom at 30,000 feet (10,000 m)? [Jason Torchinsky] at the Autopian recently gave us an interesting look 
![image](https://hackaday.com/wp-content/uploads/2025/11/tape.png?w=800")
alt=""/>Since the dawn of computers, we’ve tried different ways to store data. These days, you grab data over the network, but you probably remember using optical disks, floppies, or, more 
![image](https://hackaday.com/wp-content/uploads/2025/11/internal_server_error_cloudflare.jpg?w=800")
alt=""/>On November 18 of 2025 a large part of the Internet suddenly cried out and went silent, as Cloudflare’s infrastructure suffered the software equivalent of a cardiac arrest. After much 
![image](https://hackaday.com/wp-content/uploads/2025/11/gilbert.png?w=800")
alt=""/>If you’ve ever used an NE602 or similar IC to build a radio, you might have noticed that the datasheet has a “gilbert cell” mixer. What is that? [Electronics for 
![image](https://hackaday.com/wp-content/uploads/2025/11/AntCalc3-e1763587819641.jpg?w=800")
alt=""/>Once upon a time, owning a calculator watch was the epitome of cool. Well, for a very specific subset of the population with our own definition of “cool” anyway. The 
![image](https://hackaday.com/wp-content/uploads/2025/11/milltronics_ml15_cnc_lathe_fixed_watch_wes_work_youtube.jpg?w=800")
alt=""/>When you’re like [Wes] from Watch Wes Work fame, you don’t have a CNC machine hoarding issue, you just have a healthy interest in going down CNC machine repair rabbit holes. ![image](https://hackaday.com/wp-content/uploads/2025/03/Browser.jpg?w=800")
alt=""/>It’s likely that Hackaday readers have among them a greater than average number of people who can name one special thing they did on September 23rd, 2002. On that day 
![image](https://hackaday.com/wp-content/uploads/2025/11/bench.png?w=800")
alt=""/>[Zack], in addition to being a snappy dresser, has a thing for strange 3D printing filament. How strange? Well, in a recent video, he looks at filaments that require 445 
![image](https://hackaday.com/wp-content/uploads/2025/11/floppy-hopper-device-e1763501535787.jpg?w=800")
alt=""/>There’s a tactile joy to the humble 3.5″ floppy that no USB stick will ever match. It’s not just the way they thunk into place in a well-made drive, the 
![image](https://hackaday.com/wp-content/uploads/2025/11/pong.png?w=800")
alt=""/>You might be surprised to find out that [Akshat Joshi’s] Pong game that fits in a 512-byte boot sector isn’t the first of its kind. But that doesn’t mean it 
![image](https://hackaday.com/wp-content/uploads/2025/11/AMeagerBall_clock_analog.jpg?w=800")
alt=""/>When the iconic “Boing Ball” first debuted 40 years ago, it was a wonder to behold. There was nothing like it in the home compuing world upto that time, and 
![image](https://hackaday.com/wp-content/uploads/2025/11/figure-9-large.jpg?w=800")
alt=""/>Amidst the glossy marketing for VPN services, it can be tempting to believe that the moment you flick on the VPN connection you can browse the internet with full privacy. 