Subject: General Tech, Systems | April 8, 2012 - 08:38 PM | Tim Verry
Tagged: Raspberry Pi, pcb, emc test, computer, compliance testing, arm
The highly anticipated Raspberry Pi ARM computer has run into several launch hiccups, the most recent being that the distributors -- RS and Farnell -- refused to sell and ship the devices without the Raspberry Pi passing the proper electromagnetic interference testing. While such certification is not required for Arduino or Beagle Boards, the companies stated that because the Raspberry Pi was (more) likely to be used as a final consumer product (and not a development board) it needed to obtain and pass EMC testing to ensure that it would not interfere with (or be interfered by) other electronic devices.
According to a recent blog post by the charity behind the ARM powered Linux computer, the Raspberry Pi has passed the EMC compliance testing with flying colors -- after a few hiccups with a network hub used to test the Raspberry Pi while it was being hit with an EM field were sorted out.
The team has been working out of Panasonic’s facility in South Wales to test the Raspberry Pi. Due to having the lab area for a whole week, they managed to knock out consumer product inference testing for several other countries as well. Mainly, the Raspberry Pi is now compliant with the UK CE requirements, the United States’ FCC, Australia’s CTick, and Canada’s Technical Acceptance Certificate (TAC).
Assuming the paper work is properly filed and RS and Farnell accept the certifications, the Raspberry Pi units should begin winging their way to customers shortly. Are you still waiting on your Raspberry Pi, and if so have you decided what you intend to use it for yet?
If you are interested in the Raspberry Pi, be sure to check out some of our other coverage of the little ARM computer!
Subject: Graphics Cards | December 21, 2011 - 07:26 AM | Tim Verry
Tagged: amd, 7900, radeon hd, tahiti, gpu, pcb
Tech Power Up managed to get their hands on a couple photos of the PCBs used in the upcoming AMD Radeon HD 7900 series graphics cards. The blue boards show the traces and connectors that will eventually house the memory chips, graphics processor, capacitors, PCI-E power and video out connections (among others). This particular PCB is allegedly the "cost effective" version that is an alternative for Add-In-Board partners (for example: Sapphire, HIS, and XFX) so that they can offer lower cost cards.
The naked boards feature spots for two DVI, one HDMI, and one Display Port connector, although graphics card manufacturers do not have to include all of the connectors enabling low profile HTPC friendly versions. Further, the PCB features connections for an 8+2 analog VRM (voltage regulators), 12 memory chips, and two 8 pin PCI-E power connectors.
Keep in mind that this PCB is merely a reference design and may not be used in all Tahiti cards. AMD has given its partners free reign to design their own PCBs for the 7950 graphics cards. On the 7970 card; however, the cost effective reference design may well be used in many third party 7970 cards as an alternative to the main 7970 board design.
I suppose we will just have to wait until tomorrow for the official launch to learn more about the new cards. However, being so close to the launch date, the photos are likely representative of the actual PCB design. More photos can be found here.