Sometimes that's just not possible though. I've recently finished a double sided PCB with allot of controlled impedance tracks on one side widely spaced to prevent xtalk and to prevent arcing (its a surge protection device) with a solid ground plane on the other side.
My board house has not complained (yet). Tom. > -----Original Message----- > From: Brad Velander [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, 9 October 2002 04:18 > To: 'Protel EDA Forum' > Subject: Re: [PEDA] OT - Complex boards and time to Layout? > > > Aj or others, > same issue with plating. Differences in copper density > (over area) > effect the plating rate of Cu to the circuit pattern. > Balanced copper side > to side, area to area, is the fabricators best friend (yours > also in the > end). > > Sincerely, > Brad Velander. > > Lead PCB Designer > Norsat International Inc. > Microwave Products > Tel (604) 292-9089 (direct line) > Fax (604) 292-9010 > email: [EMAIL PROTECTED] > http://www.norsat.com > Norsat's Microwave Products Division has now achieved ISO 9001:2000 > certification > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > > Sent: Tuesday, October 08, 2002 9:51 AM > > To: Protel EDA Forum > > Subject: Re: [PEDA] OT - Complex boards and time to Layout? > > > > > > Interesting, I thought that the copper "balancing act" was only for > > containing possible warpage. Makes sense, though. Thanks for tip. > > > > aj > > > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > > >... > > > I did this type of pour and had the board house > > > slap my wrists ...The explanation was that if > > > you have a big pour with lots of copper on one > > > side you need about the same copper on the other > > > side to balance it. Otherwise the acid on one side > > > gets weak while the other side remains strong, > > > resulting in overetching on one side or > > > under-etching on the other > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
