On Sun, Jan 22, 2006 at 12:13:39AM -0800, Jose Da Silva wrote:
> On January 21, 2006 11:31 pm, Peter Todd wrote:
> > I had another post a few days ago about building a PROM from out of a
> > PCB in visible scale. The critical part of that project would be to
> > design a fuse from PCB tracks, ideally one that can be blown using
> > very little actual energy. The last requierment is especially
> > important, as I'm trying to determine the feasibility of a long term
> > counter.
> 
> Take a look at a glass 10amp fuse and you will note the wire is rather 
> thin already.
> You may be testing the boundaries of what can be considered reliable PCB 
> trace etching if you attempt to produce anything thinner, which is what 
> you need to do if you are attempting to use less power to blow a trace.

That's a rather good point... I should just go and measure one of those
wires...

Still I'm assuming that if a fab company like Advanced Circuits says
they can do 6mils for cheap, then they can do 6mils! As it is they say
they can do 4mil on special order, if I can combine that with a
non-standard 0.5oz/in2 plating thickness I may be set, I hope.

-- 
pete@petertodd.ca http://www.petertodd.ca
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