14 Sep 2016
Wednesday, September 14, 2016

Diode Orientation Rules

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As a contract manufacturer, we review many circuit board designs. Often, too often, orientation markings are missing from PCB layouts, and sometimes they are incorrect. IPC standard is explicit that the cathode (negative) is pin 1 and the side which is marked on the silkscreen. Even if you have a multicolor LED with common anode, the orientation.. read more →

20 Jul 2016
Wednesday, July 20, 2016

The Attitude of Cooperation

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Yesterday, Thomas Smiley posted an article on EBN Online – The Unspoken Truth about the Source of PCB Quality Problems. In it he’s implying that your PCB assembly shop can help you sort out any issues your design may have before the prototypes are even built, but in order to do that we need cooperation. Cooperation is an.. read more →

PCB designers should take a look at this presentation by Nine Dot. They admit that it would take several hours to cover the topic properly, but it’s a good introduction. read more →

01 Apr 2015
Wednesday, April 1, 2015

Repeating Heirarchical Sheets in Altium

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If you want to create a PCB design which repeatedly uses the same circuit, you can create a repeating sheet. REPEAT(name, firstindex, lastindex) For example, if you want to repeat the same circuit for 16 channels: REPEAT(CH,1,16) The firstindex cannot be zero or you will get the error “Port – not matched to Sheet Entry”,.. read more →

20 Jan 2015
Tuesday, January 20, 2015

Wire Selection for PCB Design

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This is a general purpose guide to select hook-up wire for internal device wiring to connect to a circuit board you may be designing. NOTICE: This information is provided as a basic reference on the assumption that you are appropriately trained in designing electrical equipment. If you are not certain, please consult an electrician or electrical engineer… read more →

When you finish a schematic and are ready to begin the PCB layout, you should perform an electrical rules check (ERC) on the schematic to catch certain basic  mistakes. As humans we are liable to make mistakes or forget small details, especially in very large projects. The ERC helps us catch many of these little mistakes… read more →

This is a response to a white paper by John McMillan of Mentor Graphics in November 2014: 7 Quick Tips for Taking Your PCB Silkscreen from Ordinary to Extraordinary I don’t disagree with the tips themselves, they just aren’t satisfactory even for the examples he provides. I’m not sure why I receive these emails from.. read more →

03 Nov 2014
Monday, November 3, 2014

Guidelines for Fiducials and Panelization

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We’ve updated our requirements for PCB fiducials and panelization and published them to our web site here. Dena Technologies PCB Fiducial Guidelines Dena Technologies PCB Panelization Guidelines   read more →

22 Jan 2013
Tuesday, January 22, 2013

IPC Standards

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Electronics manufacturers follow standards established by IPC <http://www.ipc.org/> (The Institute for Interconnecting and Packaging Electronic Circuits). Someone designing a PCB may not be familiar with these standards since they must be purchased from IPC, however DENA can provide guidance and answer questions during the design phase which can help produce a better quality result. read more →