OK, after a year, I'm done with Bluesky. I might be using it wrong, but I get very little human interaction here and my feed consists 100% of outrage politics. I'm on Mastodon (infosec.exchange/@lcamtuf), Twitter, or can be reached at [email protected]. I also write at lcamtuf.substack.com.

Cursed circuits #4: PLL frequency multiplier lcamtuf.coredump.cx/blog/pll/

I recently refreshed my article on analog-to-digital and digital-to-analog conversions. Did you know that there are many different ways to convert analog voltages to bits and bytes, and that some of the methods are quite... unhinged? Check it out: lcamtuf.coredump.cx/blog/convers...

Cursed circuits 3: true mathematics lcamtuf.coredump.cx/blog/true/

New mini display

Cursed circuits #2: switched capacitor lowpass - lcamtuf.coredump.cx/blog/switched/

Cursed circuits: voltage halver lcamtuf.coredump.cx/blog/halver/

It's hard to build an oscillator: lcamtuf.coredump.cx/blog/oscilla...

Me: I want to have more friends Tech companies:

When it comes to writing, LLMs have won - lcamtuf.coredump.cx/blog/llm-win/

What's the deal with Euler's identity? lcamtuf.coredump.cx/blog/euler/?b

Things you can do with diodes: lcamtuf.coredump.cx/blog/diodes/?b3

You know, life used to be more fun in the 1930s

Weekend projects: Chicken Squisher - lcamtuf.coredump.cx/blog/squisher/

October is Cybersecurity Awareness Month! Please be aware of cybersecurity. If you encounter cybersecurity, DO NOT APPROACH IT. Back away slowly. Protect children and pets. Make noises to scare it away.

Today I needed a bit of code, but instead of asking an LLM I tried writing it myself and wow, this could be a new paradigm

OK, here it is - the latest in captcha technology: lcamtuf.coredump.cx/captcha/

Zombies: lcamtuf.coredump.cx/blog/zombies/?n2

How has mathematics gotten so abstract? lcamtuf.coredump.cx/blog/abstract/?1

My wife asked me some time ago to build an automated door opener / closer for the coop, and needless to say, our design firm takes this very seriously

The joys of rural living

Boss: hey Bob, our users are asking for an API to determine if a video can be played in the browser. Bob: yeah, I get it, but this is really complica -- Boss: go on now, git! You'll figure it out. Bob: [muttering to himself]

The latest

Folks, we have the best π: lcamtuf.substack.com/p/folks-we-h...

Lord give me strength to stay on this platform

Getting silly with C, part ~(~1<<1) lcamtuf.coredump.cx/blog/c3/?n

How many dimensions is this? lcamtuf.coredump.cx/blog/dimensi...

My position on the "doomsday" risk of superhuman AGI is that if IQ offered you a decisive advantage, the world would be run by nerds. I think it's essentially a geek power fantasy. The returns on puzzle-solving skills rapidly diminish past some modest threshold.

I'm sorry folks, the spec made it clear

An update on the chicken coop. Doors and windows by my wife (there's another window on the back, and a chicken door inside).

Multitudes: lcamtuf.substack.com/p/multitudes

If you work in software, you know about the halting problem. But you *can* decide if a program halts in a finite number of steps! Except, when you do, it kinda summons the ghost of Kurt Gödel. An accessible essay on the limits of algorithmic knowledge: lcamtuf.coredump.cx/blog/beavers...

A slightly unhinged calculator fact: in the golden era of electronic calculators, some Japanese shopkeepers were reluctant to trust the newfangled device, so Sharp made a line of combination calculator / abacus devices. Here's a photo, next to some other stuff I own.

An update on an update on the chicken coop

I don't know where you folks get your non-orientable manifolds, but the experience of ordering from Cliff Stoll at kleinbottle.com is second to none

What is infinity, and why it's not trivial to show that 0.9999... is equal to 1: lcamtuf.substack.com/p/09999-1

The proof that π = 4 lcamtuf.coredump.cx/blog/pi/

Self-referential abstractions, or a quick look at the wacky epistemology of analog circuitry. lcamtuf.coredump.cx/blog/abstrac...

I finally decided to bite the bullet

An update on chickens

A 20-minute intro to complex numbers (featuring cats): lcamtuf.coredump.cx/blog/complex/

Decibels are ridiculous: lcamtuf.coredump.cx/blog/decibels/

There's this joke primality testing library that claims 95% accuracy in O(1) time: github.com/mawerty/Is-P... It does so by always returning false. The density of primes between 1 and n approaches 1/ln(n). For a 32-bit int, 4.6% of values are prime, so the code is right 95.4% of the time. 🡇

Can you have complex numbers in 3D, and what the heck are quaternions? lcamtuf.coredump.cx/blog/complex2/

I'm old enough to remember when our #1 concern about the veracity of online information was that anyone could edit Wikipedia

The Mathematics of Love: lcamtuf.coredump.cx/blog/love/