> My PCB does not have any fine traces. It's a pure CMOS class A audio amp > and power supply. 3-4 traces are 25 mil wide (audio in), everything else is > at least 50 mil wide, mostly 250 mil wide.
Pure class A, eh? Those are the best sounding space heaters I know of ;-) When you say CMOS, do you mean a MOSFET amp? Still looking forward to your USB uber-fi codec. When will that be available? Anyone heard how the new class D amps sound? Several chip makers (TI, Zetex, etc.) have come out with class D amp chips recently. Personally, I'm skeptical until I get to audition an amp made from these. Might be good for el cheapo consumer audio, but hi-fi? I suppose a class D done right could sound good, but if you go cheap on the post-amp LC filters, it could sound really bad. And using high quality magnetics might end up making it cost as much as a class AB amp would. Best regards, Ivan Baggett Bagotronix Inc. website: www.bagotronix.com ----- Original Message ----- From: "Brian Guralnick" <[EMAIL PROTECTED]> To: "Protel EDA Forum" <[EMAIL PROTECTED]> Sent: Thursday, August 14, 2003 7:57 PM Subject: Re: [PEDA] PCB Copper thickness VS mounted rails. > > The problem with calling out 4 oz. Cu, or even 2 oz. for that matter, is > > that the board house will probably "pattern plate" the Cu, and it may not > be > > uniform. There is additionally the problem of etching small traces in the > > same layer, due to the thickness. > > My PCB house says that their process is a positive growth of copper, not > an etch process. Is this your described "pattern plate"? When you say "not > uniform", how much error can I expect? Will it matter with traces from 50 > mil to 500 mil. > > My PCB does not have any fine traces. It's a pure CMOS class A audio amp > and power supply. 3-4 traces are 25 mil wide (audio in), everything else is > at least 50 mil wide, mostly 250 mil wide. > > _____________ > Brian Guralnick > [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] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
