«Фамипия». Венгерские домофоны в подъездах Питера

Приветствую всех!
Уверен, многие видели на стенах старых домов эти штуки - довольно большие серебристые или цветные панели с кучей кнопок на них. Сейчас практически все они давно разбиты или выдраны, однако те, кто постарше, возможно, даже успели застать их рабочими. И нет, никаких фамилий там нет: называлась эта панель именно так.

И, хотя рабочих таких домофонов уже нигде нет, мне всё же удалось заполучить один умеренно целый экземпляр. Так что сегодня у нас есть уникальный шанс ознакомиться с его схемой и начинкой и увидеть этот артефакт восьмидесятых в работе.

Ridiculously tiny ESP32-C3 board features USB-C, one LED, and a ceramic antenna

PegorK’s f32 might be the world’s smallest ESP32-C3 board. It measures just 9.85 x 8.45 mm, or slightly larger than the area covered by a USB Type-C connector. A board of this size will have limited features, and besides the ESP32-C3FH4 RISC-V WiFi and Bluetooth microcontroller, it comes with a USB-C port, a ceramic antenna, and a single GPIO pin connected to an LED. f32 specifications: SoC – Espressif Systems ESP32-C3FH4 Single-core 32-bit RISC-V microcontroller @ up to 160 MHz Memory – 400 KB SRAM Storage – 4MB flash Wireless 2.4 GHz Wi-Fi 4 & Bluetooth 5.0 USB – 1x...

A Paper Caper: The Hole Data

https://invidious.privacyredirect.com/watch?v=QzRhDXnpn3Q

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 recently, flash drives to load something into your computer. Old computers had to use a variety of methods, such as magnetic tape. But many early computers used some technology that existed from the pre-computer era, like punched cards or, as [Anthony Francis-Jones] shows us, paper tape.

Paper tape was common in TeleType machines and some industrial applications. In fact, as early as 1725, looms could use paper tape, which would eventually...

AOMedia AV2 open video codec release nears, delivers around 40% bandwidth reduction

The Alliance for Open Media (AOMedia) will release the AV2 open video codec specification by the end of the year, as an update of the now widely-used AV1 video codec with up to 40% bandwidth reduction at the same level of quality. In the meantime, Debargha Mukherjee, Google Principal Engineer, has shared a progress report about AV2, first offering a historical perspective with the list of digital video codecs from 1990 to 2030 (expected), then stating AV2 goals, and going through requirements, coding tools, and what’s been achieved so far. You can check the eleven-minute presentation (04:27 – 15:30) embedded...

How One Uncaught Rust Exception Took Out Cloudflare

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 panicked debugging and troubleshooting, engineers were able to coax things back to life again, setting the stage for the subsequent investigation. The results of said investigation show how a mangled input file caused an exception to be thrown in the Rust-based FL2 proxy which went uncaught, throwing up an HTTP 5xx error and thus for the proxy to stop proxying customer traffic. Customers who were on the old FL proxy...

Gilbert Cell Lacks Sullivan

https://invidious.privacyredirect.com/watch?v=mQ36yy7mloA

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 the Inquisitive Experimenter] explains them in a recent video. The gilbert cell is a multiplier, and multiplying two waveforms will work to mix them together.

At the heart of the gilbert cell is essentially three differential amplifiers that share a common current source. The video shows LTSpice simulations of the circuits as he explains them.

One reason these work well on ICs is that they require very closely-matched transistors. In real life,...

LILYGO Expands T-Beam Series With New 1W LoRa GPS Board

LILYGO has introduced the T-Beam 1W, an ESP32-S3 development board that combines LoRa connectivity, GNSS positioning, an OLED display, and SD card storage. It follows the familiar T-Beam layout while adding a higher-power LoRa front end for long-range communication tasks. The system is built around the ESP32-S3FN8, a dual-core Tensilica LX7 processor with 16 MB […]

OnLogic Refreshes Its CL Series With the New CL260 Edge Gateway

The CL260 is presented as an ultra-compact industrial edge gateway built around Intel N-Series processors. It is intended for deployments that require a small, durable, and headless controller operating within cabinet-mounted or space-restricted environments. The system offers configuration options for storage, wireless connectivity, and operating systems. The system uses either the Intel N150 or Intel […]

Wear this RISC V, RPN Calculator Watch for Maximum Nerd Cred

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 only thing cooler than wearing a calculator watch? Making a calculator watch, of course! If you do it as part of developing your own SDK for a popular RISC V microcontroller, all the better. That’s what [Miroslav Nemecek] did with his Antcalc watch, which is one of the demo projects for the CH32Lib SDK, which is currently under development at version 0.35 as this is written.

Fixing a Milltronics ML15 CNC Lathe Despite the Manufacturer’s Best Efforts

https://invidious.privacyredirect.com/watch?v=BuQZeiAugp4

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. Such too was the case with a recently acquired 2001 Milltronics ML15 lathe, that at first glance appeared to be in pristine condition. Yet despite – or because of – living a cushy life at a college’s workshop, it had a number of serious issues, with a busted Z-axis drive board being the first to be tackled.

The...