Thanx Terry for this information... A few more things... What is a footprint? And is the VIA visible from the ouside?
----- Original Message ----- From: "Terry Creer" <[EMAIL PROTECTED]> To: "'Open Topic Forum'" <[EMAIL PROTECTED]> Sent: Thursday, May 16, 2002 10:51 AM Subject: Re: [OT] Protel Terminologies > G'day Waheed > I'll try to explain as simply as I can.... > > PAD - Usually round or square aread of copper used to connect copper on the > circuit board to a component or wire. It can appear on one or more layers, > also. It may have a hole (for leaded components) or not (SMD components) > > VIA - A round area of copper similar to a pad with a hole in the centre > which is used to interconnect two or more layers of the PCB. > > (TOP) OVERLAY - This layer is used by pcb manufacturers to print the > silkscreen layer onto a surface of the finished PCB. Top Overlay is the > silkscreen on the top layer of the board. > > KEEP OUT LAYER - A keep out is a track, fill or any other primitive used to > indicate that copper should not be placed that vicinity. Usually, we do a > keepout layer track around the outline of a PCB to inidcate the limit of > copper, or a thick track to ensure high-voltage clearance, etc,etc.... > > INTERNAL PLANES - These are usually copper layers beneath the outside > surface of the PCB. For example, a 4 layer PCB has 2 External Layers (Top > Layer and Bottom Layer) and 2 Internal Planes. > > Hope this helps......I'm not a great teacher.... > > > -----Original Message----- > From: Waheed Bajwa [mailto:[EMAIL PROTECTED]] > Sent: Thursday, 16 May 2002 2:27 PM > To: Open Topic Forum > Subject: [OT] Protel Terminologies > > > Hello all, > > I am starting afresh for Protel (and PCB designing) so I need some > assistance on a few things... Lets start from the basics... > What do the following terms mean? Please explain in detail... > > PAD > VIA > OVERLAY > TOP OVERLAY > KEEP OUT > KEEP OUT LAYER > INTERNAL PLANE(s) > > Best Regards, > Waheed Bajwa > > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > * To post a message: mailto:[EMAIL PROTECTED] > * > * To leave this list visit: > * http://www.techservinc.com/protelusers/leave.html > * > * Contact the list manager: > * mailto:[EMAIL PROTECTED] > * > * Forum Guidelines Rules: > * http://www.techservinc.com/protelusers/forumrules.html > * > * Browse or Search previous postings: > * http://www.mail-archive.com/[email protected] > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
