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Chinese PoE extractor teardown
I needed to power some cameras using Power over Ethernet but they only supported 12V input, so I ordered some PoE extractors from ali. Here they are for your information.
Black one White waterproof one ConclusionThey both only support 100Mbps over 2 pairs. The wateproofing was quite annoying to remove but not impossible. It seems they both can be modified to support different input/output voltage. As you can see in the pictures, they are both using H6225K step-down regulator in a very similar design.
The circuit mostly corresponds to following schematic found on the internet:
Thank you for your attention.
January Update: Thinking Out Of The Vox
This month we report on some news concerning the PineVox, what the community have been up to with their PineNotes and the brand-new 1.15 InfiniTime update. We would like to wish our community a happy New Year and hope you all had a good end of 2024.
But since it’s now the beginning of 2025, we’d like to fill you in on what we have planned for the first part of the year.
We plan to release the PineVox to the public thanks to Gamiee’s recent progress and we plan to continue improving the software for the PineNote, thanks to Maximilian, Diederik...
Please refrain from installing WASP-OS on new PineTimes for the moment
In July 2024, PineStore notified the community that a small hardware change was needed on the PineTime: the current flash chip was end of life (EoL) and needed to be replaced by a new one. From the software point of view, the new chip behaves exactly like the old on so very few code changes were required to support it.
The new chip exposes different identifiers (manufacturer ID, for example) than the previous one. Which means that if the software checks those IDs, it would need to be updated to take the new ones into account.
No change was needed in InfiniTime,...
Free Stuff - September 2024
The belated September 2024 recipient for the Great Scott Gadgets Free Stuff Program is Allen Paschel of Orlando, Florida in the United States. Allen is the president of The Maker Effect Foundation which exists to inspire everyone to create! The Maker Effect Foundation is a non-profit organization that runs a maker space and teaches classes at schools, libraries, and events. The maker space has CNC machines, laser etcher/cutters, 3D Printers, vacuum forming equipment, welding tools, electronic tools, and other arts tools. Soon they will be able to add software-defined radio to that list of tools as we are sending them...
Free Stuff - August 2024
The belated August 2024 recipient for the Great Scott Gadgets Free Stuff Program is Murat Sever! Murat teaches a Communication Systems Laboratory course at TOBB ETU University, Ankara, Turkey. In his labs, Murat uses two HackRFs to transmit signals of interest, which students receive via RTL-SDRs. Murat has requested an Opera Cake so his students can study Pseudo Doppler direction finding and to teach students about antenna switching and spectrum monitoring. For more information about Murat’s course, his and his students’ research projects, and their outreach programs, please check out their website (https://ele361l.github.io/).
This application for the Free Stuff program stood...
Free Stuff - July 2024
The belated July 2024 recipient for the Great Scott Gadgets Free Stuff Program is Scott Carter from Ontario, Canada! Scott operates a SETI station that uses a radio telescope he built using software defined radio. He says the radio telescope has been in operation for six and a half years, and it needs a receiver upgrade to allow scanning of frequencies above 2 GHz. We are sending Scott a HackRF One so he can make his radio telescope upgrade! Scott’s long-term goal is to make his SETI station accessible remotely for educational purposes so more folks can learn about radio...
Free Stuff - June 2024
The belated June 2024 recipient for the Great Scott Gadgets Free Stuff Program is Evan Metzinger. Evan is the president of the Cybersecurity club at Mt. San Antonio college in Walnut, California in the US. We will be sending Evan a HackRF One so he and his club can get some hands on experience with signals processing and participate in wireless capture the flag competitions.
Free Stuff - May 2024
The belated May 2024 Free Stuff recipient for the Great Scott Gadgets Free Stuff Program is Anik Mahanta from India! Anik is a student who is part of the CyRaksha Cybersecurity Club of Kolkata. CyRaksha is a free-to-join club that hosts their meetups both in-person and online. They will be using the HackRF One we are sending them to create CTF challenges, host informal meetups about RF technologies, and to create open access materials on how to use HackRF One safely while respecting Indian law.
Может ли Orange PI 5 Plus с 32 ГБ памяти заменить домашний/офисный ПК?
Производительность ARM процессоров каждый год увеличивается и все ближе к x86 процессорам. Компания Apple давно отказалась от процессоров Intel в пользу процессоров собственной разработки на ARM архитектуре. Но домашний/офисный ПК это не только процессор, но и софт, драйвера, и подключение любых устройств из коробки. Компания Shenzhen Xunlong Software вначале 2023 г. выпустила одноплатный компьютер Orange PI 5 Plus на базе высокопроизводительного процессора Rockchip RK3588 с 32 ГБ ОЗУ и возможностью подключения NVMe SSD дисков. По техническим характеристикам такой одноплатный компьютер сопоставим с домашним/офисным ПК. Проверим на сколько комфортно работать за таким одноплатником, смотреть YouTube, видео, и конечно же поиграем, установим...
Вакуумное магнетронное напыление на дому
Привет, Хабр! Последнее время здесь появились очень интересные статьи по вакуумному и стеклодувному делу, вызывающие неподдельный интерес у публики. Как насчет двинуться дальше, и начать серию статей про изготовление микросхем на дому? Многолетнюю, разумеется. Я по другому не умею :)
Тут вам и легирование кремния, и фотолитография, и вакуумное магнетронное и термическое напыление металлов и оксидов на подложку.
Совершенно случайно мне подвернулись остатки от универсального вакуумного поста ВУП-4 и я решил с головой погрузиться в эту дорогую и сложную область инженерного дела. Вообще я не планировал напылять в этой серии, но меня уговорили.
Подробности подкатом