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Subject: Re: [ModularSynthPanels] Re: LPG's

From: Suit & Tie Guy <erwill@...>
Date: 2008-12-21

On Dec 20, 2008, at 3:39 PM, thomas white wrote:
2oz copper - does if make any electrical difference in
sound? Does it last longer?

it makes not a significant difference in sound or longetivity that i'm aware of.

however i makes a huge impact on the reworkability. i've been using 2 oz copper process for 2.5 years now and have only lifted a trace once through rework. fyi: that module never shipped. 

the supplier i work with charges only a few pennies extra per board for 2 oz process. they are speedypcb.com, and are a broker for a chinese firm from the shipping cost and packing list that comes with the boards.

tin/lead finish - Have you had a problem with the RoHS
compliant finish before? 

the problem is twofold. first i'm assuming some of the difficulty i'm having in soldering this comfortably has to do with the low trace weight. another is the lead-free finish. the other issue i have stuffing this PCB is the extremely small solder pads. i'm really not sure what is the biggest issue is, but i'm interested. the low trace weight should make "taking" the solder easier, however it makes me nervous to work with because i worry about damaging the board while soldering.

i'm using a Weller WES51 with a ETH tip at 750 degrees farenheit. i moved to this tip because of the smallish pads on an early PCB which were corrected, and it's still large enough to make me freak out about how long it takes for this board to flow solder ... i worry about damaging the soldermask when i'm working with this board. i'm also open to criticism of my solder technique. i could just be a Mr Complainey Pants as i seem to be the only person whining.
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Suit & Tie Guy
suitandtieguy.com
stgsoundlabs.com