Author Archive: ruby

Como usar um kit de reballing BGA

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Dessolde e remova o BGA IC do PCB.
Agora limpe a solda da parte inferior do IC e da PCB onde o IC foi soldado. Use um ferro de solda e um fio ou pavio para dessoldar.
Agora selecione o tamanho certo do IC dependendo do número de bolas do estêncil fornecido com o kit.
Coloque o IC no estêncil e segure-o firmemente com o estêncil usando clipe ou fita adesiva.
Agora aplique pasta de solda do outro lado do estêncil. A pasta de solda vai grudar no IC através dos pequenos orifícios do estêncil.
Agora aplique ar quente usando a estação de retrabalho SMD. Isso solidificará a pasta de solda e formará bolas de solda que grudarão no IC.
Agora limpe o IC com solução de Acetona ou IPA e remova-o do estêncil.
Agora o BGA está pronto para soldar de volta ao PCB. Isso é feito colocando o IC no PCB e aplicando calor.

BGA Reballing Kit and How to Use

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BGA Reballing Kit is used for reballing the solder balls of a BGA IC (Ball Grid Array). There are several Kits and BGA rework stations available in the market.

Most repairing professionals generally start with a starter Kit and gradually shift to latest universal kits and stations.

Contents of BGA Reballing Kit
ESD-Safe Cleaning Brush.
BGA Reballing Stencil.
BGA Desoldering Wire / Wick / Braid
Solder Paste.
Acetone or IPA Solution.
Soldering Flux.
Heat Resistant Kapton Tape or Clips to hold the BGA IC to the Stencil.
PCB Holder.
Tweezers.
SMD Rework Station and Soldering Iron are generally NOT a part of the Kit.

 

Как подключиться к безголовому Raspberry Pi со своего ПК?

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1. Скачайте, установите и запустите VNC Viewer.htt
2. Выберите «Новое соединение» в меню «Файл».
3, введите имя хоста (например: raspberrypi. …
Нажмите «ОК».
4. Дважды щелкните значок подключения для подключения.
5. Нажмите «ОК», если отображается предупреждение системы безопасности.
6. При появлении запроса введите имя пользователя и пароль Pi.

What is the difference between pipes and sockets? Why does Unix use pipes for interprocess communication?

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Both pipes and sockets handle byte streams, but they do it in different ways…
pipes only exist within a specific host, and they refer to buffering between virtual files, or connecting the output / input of processes within that host. There are no concepts of packets within pipes.
sockets packetize communication using IPv4 or IPv6; that communication can extend beyond localhost. Note that different endpoints of a socket can share the same IP address; however, they must listen on different TCP / UDP ports to do so.
Usage:
Use pipes:when you want to read / write data as a file within a specific server. If you’re using C, you read() and write() to a pipe.
when you want to connect the output of one process to the input of another process… see popen()
Use sockets to send data between different IPv4 / IPv6 endpoints. Very often, this happens between different hosts, but sockets could be used within the same host
BTW, you can use netcat or socat to join a socket to a pipe.