Re: gEDA-user: any last minute advice prior to sending out for PCB fab

[Steven Michalske <smichalske@xxxxxxxxx>]

On Feb 24, 2010, at 1:41 PM, Bob Paddock wrote:

> To DJ's comment.  We usually do go with pre-programmed parts
> eventually.  Solder jumpers
> are a really bad  idea when doing anything more than few boards.  Even
> zero ohm resisters jumpers
> cost real money.


I believe it was my comment that referenced DJ's solder jumpers.

Solder jumpers are not always a really bad idea.  They can be hand  
populated much easier than 0 ohm resistors and cost less.

The whole point of the solder jumpers have two uses.

1.
A jumper with a dollop of solder applied at SMT using the solder mask   
is cheaper than a 0 ohm resistor for rework purposes, As the resistor  
needs solder + resistor.
After the design is finalized a new board can be spun that shorts the  
jumper with copper.  When you need to disconnect for rework, just use  
solderwik and remove.

2.
A jumper with the solder not applied at SMT,  so that the connection  
is not made until the solder is applied at a later time.
This jumper is much easier to apply than a resistor by an operator.  A  
hot iron and solder are the only things needed,  not tweezers or parts.

#2 is used to manufacture products built on the millions of units scale.

Steve


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