Радио почти из ничего. Самодельные радиодетали 1920-х. Детекторы

В продолжение путешествия к истокам радио (самодельные резисторы 1920-х [1], самодельные конденсаторы 1920-х [2]) мы с тобой, дорогой читатель, обратим свой взгляд на тогдашние детекторы — важнейший элемент любого долампового радио, выделяющий из радиочастотных колебаний звуковой сигнал. Какие же существовали материалы и конструкции детекторов, пригодных для изготовления скудными средствами среднестатистического энтузиаста-любителя радио? Чем последнего, в этом смысле могла порадовать отечественная промышленность? Во времена, когда ещё не существовало готовых фабричных элементов-полупроводников, когда самым сложным инструментом в арсенале радиомастера, вероятнее всего, мог быть простой электрический паяльник, да и само сетевое электричество водилось не во всяком доме.

M5Stack PaperColor ESP32-S3 devkit features 4-inch E Ink Spectra 6 color display

M5Stack PaperColor, or M5Paper Color, is an ESP32-S3 development kit with a 4-inch E Ink Spectra 6 full-color display with a resolution of 600×400, designed to offer both low power consumption and high visibility under strong lights. While the color ePaper display is the start of the show, the devkit also features a microSD card slot for storage, a microphone with echo cancellation, a 1W speaker, a temperature & humidity sensor, a few buttons, two RGB LEDs, an IR transmitter, and a Grove connector for expansion. With regards to power, a 1250 mAh battery is included, rechargeable through the device’s...

Форвард-М. Странный домофон со странными функциями

Приветствую всех!

Пожалуй, самыми странными среди домофонов являются не какие-то раритетные экземпляры с оптическими или магнитными ключами, а «локальные» модели, выпускавшиеся одним предприятием для одного города или региона. В самом деле, столь странных конструктивных решений, какие встречаются там, порой не встретить больше нигде. Про пару таких девайсов я уже рассказывал, и вот ко мне попал очередной — некий «Форвард» весьма странного вида и с не менее странной схемотехникой.

Итак, в сегодняшней статье посмотрим на один из самых распространённых в Сибири домофонов. Заодно узнаем, зачем в нём RTC и батарейка, как его оживить и что ещё отличает его от привычных нам...

Start9 RISC-V Router features SpacemiT K1 SoC, runs StartWRT OpenWrt fork (Crowdfunding)

Start9’s “RISC-V Router” is powered by a SpacemiT K1 octa-core RISC-V processor paired with 4GB RAM and 16GB eMMC flash, and offers dual GbE networking, as well as an AsiaRF AW7915-NP1 WiFi 6 4T4R module enabling up to 2401 Mbps combined data link. It’s not exactly a high-end router, but Start9 claims it is the “most open router on the market” thanks to its RISC-V processor, OpenSBI open-source boot stack, and StartWrt operating system, a fork of OpenWrt. Start9 router specifications: SoC – SpacemiT K1 CPU – 8-core X60 RISC-V processor with single-core performance equivalent to about 1.3x the performance...

M5Stack PaperColor is an ESP32-S3 dev kit with Spectra 6 e-paper panel

M5Stack has introduced the PaperColor, a compact development board built around the ESP32-S3R8 processor and a 4-inch Spectra 6 full-color e-paper display. The platform combines wireless connectivity, onboard sensors, audio hardware, battery operation, and expansion interfaces for low-power IoT and embedded display applications. The system is based on the ESP32-S3R8 SoC featuring dual Xtensa LX7 […]

Yocto Project 6.0 “Wrynose” released with Linux 6.18 LTS

The Yocto Project 6.0, codenamed “Wrynose”, has just been released with Linux 6.18 LTS, about two years after Yocto Project 5.0 “Scarthgap” release with Linux 6.6 LTS. Over 240 contributors submitted over 4000 commits since the previous Yocto 5.3 “Whinlatter” minor release of the popular framework used to create custom embedded Linux distributions. Yocto Wrynose is a Long Term Support (LTS) release, which will be supported until at least April 2030. The project’s developers especially highlight these 4 years of support, improved SBOM and CVE tracking features, and more secure defaults to ease compliance with the upcoming EU Cyber Resilience...

PortaRF single board SDR mixes HackRF One and PortaPack H4M hardware, adds AI voice control

Designed by OpenSourceSDRLab, the PortaRF is an open-source software-defined radio (SDR) that integrates HackRF One and the PortaPack H4M into a single device. It’s a standalone device that supports transmitting and receiving radio signals from 1 MHz to 6 GHz. Traditionally, a portable HackRF setup meant stacking a PortaPack on top of the main board. PortaRF replaces this with a single PCB, making it more compact, easier to use, and with improved signal quality. It also adds a larger display, more flash, and a bigger battery. PortaRF specifications: MCU – NXP LPC432 dual core ARM Cortex M4/M0 (LPC4320FBD144) microcontroller CPLD Xilinx...

Cadence Joins OpenTitan as a Tools Partner to Accelerate Open-Source Silicon Security

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Clawdmeter – A DIY ESP32-S3 desk dashboard for Claude Code token usage monitoring

Clawdmeter is a DIY ESP32-S3-powered desk dashboard that displays Claude Code token usage on a 2.16-inch AMOLED screen so you know when you’re about to reach the limits in real time. It’s mostly a firmware project since it relies on off-the-shelf hardware (Waveshare ESP32-S3-Touch-AMOLED-2.16). It leverages the LVGL library for its graphics user interface, the NimBLE stack for Bluetooth LE (BLE) communication, and also functions as a HID keyboard for shortcuts using the buttons from the unit. We previously covered Waveshare ESP32-S3-Touch-AMOLED-1.8 with a 1.8-inch display, but never the 2.16-inch variant, so let’s have a quick look at the hardware...

Wireless-Tag previews IDO Claw ARM platform with OpenClaw pre-installed

Kickstarter recently featured the IDO Claw campaign, a compact ARM-based system from Wireless-Tag designed for local OpenClaw deployment. The fanless platform combines the Rockchip RK3576 processor with LPDDR5 memory, onboard storage, dual Gigabit Ethernet, and hardware video acceleration for always-on AI and edge workloads. The system is built around the Rockchip RK3576 processor, which combines […]