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How to Securely Erase an old Hard Drive on macOS Tahoe
Apparently Apple thinks nobody with a modern Mac uses spinning rust (hard drives with platters) anymore.
I plugged in a hard drive from an old iMac into my Mac Studio using my Sabrent USB to SATA Hard Drive enclosure, and opened up Disk Utility, clicked on the top-level disk in the sidebar, and clicked 'Erase'.
Lo and behold, there's no 'Security Options' button on there, as there had been since—I believe—the very first version of Disk Utility in Mac OS X!
ESP32-P4 Feather Board
This is a Feather-format board based on the new ESP32-P4 high performance processor from Espressif:
The ESP32-P4 Feather board.
The ESP32-P4 is a dual-core RISC-V processor running at up to 400MHz, with 768KB of on-chip SRAM, 32Mbytes of on-chip PSRAM, and up to 32Mbytes of external flash.
IntroductionAfter designing the AVR128DA32 Feather Board I read about Espressif's new ESP32-P4 processor, a high-performance processor with a RISC-V core, and decided it would be an interesting challenge to design a Feather-format board based on that. Like other recent ESP32-series chips the ESP32-P4 includes an internal native USB interface, so I decided to design the board...
Play CDs with HomePods: Add AirPlay to a Vintage CD Player
In this project, I’ll show how to convert a bog-standard CD player into a fully self-contained AirPlay CD player that “just works”. No external boxes. No fiddly startup rituals. Put …
The post Play CDs with HomePods: Add AirPlay to a Vintage CD Player appeared first on lo-tech.
Кустарные вакуумные триоды Клода Пайяра. Часть 5. Конструкция лампы
Продолжим знакомство с работой современного французского энтузиаста-электровакуумщика Клода Пайяра [1], воссоздавшего в своей мастерской кустарное микропроизводство ранних высоковакуумных триодов — варианта легендарного ТМ [2]. Ранее мы уже рассмотрели его огневое оснащение [1], технологическую печь, контактную сварку [3] и ламповый аппарат ТВЧ [4], полюбопытствовали, чем Клод откачивает свои лампы [5]. С воображаемой лупой в руках посмотрим же, как устроен его вариант триода, чем он похож и чем отличается от исторических прототипов; по характерным примерам последних проследим часть эволюции этой выдающейся лампы.
Читать далееЧто на самом деле показывал индикатор частоты ЦП на корпусе?
Приветствую всех!
Когда-то давно тут уже рассказывали про кнопку Turbo и про замок на корпусе ПК. Самое время вспомнить ещё один неотъемлемый атрибут компьютеров тех лет: индикатор частоты процессора.
Казалось бы, это до невозможности банальная штука, не сложнее индикатора питания. Но всё оказалось не так уж просто и даже у этого устройства иногда можно было найти много интересного. Давайте разбираться...
Press F1 to continueFree Stuff - September 2025
The belated September 2025 recipient for the Great Scott Gadgets Free Stuff Program is Ashen Chathuranga, a university student from Sri Lanka. He is working on a project involving the development of an open source satellite monitoring station and requested a HackRF One to conduct his research. He will also be researching radio wave penetrating materials for his university. Being able to assist students in need of equipment for academic research and goals is one of our primary goals for our Free Stuff Program, so we are happy we were able to help Ashen out!
Free Stuff - October 2025
The belated October 2025 recipient for the Great Scott Gadgets Free Stuff Program is Alex Barnes, who applied on behalf of Amateur Radio and Electronics Society (QUB_ARES) at Queen’s University Belfast! Alex has informed us that they are an academic society primarily focused on running regular educational events around radio and electronics. So far they have run lessons and training for their members to get UK Foundation Amateur Radio licenses, worked with a local Scouts group for Jamborees on the Air, and she ran a series of events last year where she demonstrated using an SDR and a few 433...
Free Stuff - November 2025
The belated November 2025 recipient for the Great Scott Gadgets Free Stuff Program is Srajan Sonkesriya from India! Srajan is currently working on an open source project where he is turning an Android device (Realme 5 Pro, RMX1971) into a portable RF experimentation and learning platform. His goal is to show that a smartphone, when paired with a properly customized kernel and open-source tools, can function as a compact RF workstation for students and beginners who cannot afford other common equipment. He says that so far, he has successfully built a custom kernel for Android 16 and added multiple patches...
Frigate with Hailo for object detection on a Raspberry Pi
I run Frigate to record security cameras and detect people, cars, and animals when in view. My current Frigate server runs on a Raspberry Pi CM4 and a Coral TPU plugged in via USB.
Raspberry Pi offers multiple AI HAT+'s for the Raspberry Pi 5 with built-in Hailo-8 or Hailo-8L AI coprocessors, and they're useful for low-power inference (like for image object detection) on the Pi. Hailo coprocessors can be used with other SBCs and computers too, if you buy an M.2 version.
OpenTitan’s Transition to Side-Channel Resilient Post-Quantum Cryptography
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