Reflow of 'solder blob' Jumpers

[Christoph Loew]

Hi everyone,

i was wondering :
has anyone used different solder paste masks for a reflow-soldered
PCB to configure solder blob jumpers as open/closed ?

I was thinking of using this technique to set I2C-bus addresses for
a bunch of otherwise identical PCB's that will be manufactured on one
panel; it would save using 0-Ohm-Resistors for the configuration.

Can this be done reliably ?

Any hints appreciated,

Chris

 

[sPoNiX]

On Fri, 01 Oct 2004 17:46:48 +0900, Christoph Loew
<christoph@zmp.co.jp> wrote:

Hi everyone,

i was wondering :
has anyone used different solder paste masks for a reflow-soldered
PCB to configure solder blob jumpers as open/closed ?

I don't think you could do it with a solder paste mask. However, such
links are widely used on panel meters and in car alarm keyfobs etc and
are perfectly reliable when make with a soldering iron.

sPoNiX

 

[legg]

On Fri, 01 Oct 2004 11:10:14 GMT, sPoNiX@yahoo.com (sPoNiX) wrote:

On Fri, 01 Oct 2004 17:46:48 +0900, Christoph Loew
christoph@zmp.co.jp> wrote:

Hi everyone,

i was wondering :
has anyone used different solder paste masks for a reflow-soldered
PCB to configure solder blob jumpers as open/closed ?

I don't think you could do it with a solder paste mask. However, such
links are widely used on panel meters and in car alarm keyfobs etc and
are perfectly reliable when make with a soldering iron.

sPoNiX

He wants to save the cost of a single smd placement, not the
exhorbitant costs implied in 'manually' soldering or trimming
anything...........

RL

 

[John Woodgate]

I read in sci.electronics.design that Al <no.spam@wanted.com> wrote (in
<no.spam-9EC0FD.10424002102004@news.verizon.net&gt about 'Reflow of
'solder blob' Jumpers', on Sat, 2 Oct 2004:

Two of the
elements were circular, ring shaped, ceramic capacitors

Phenomenally good capacitors, with vanishing inductance. Many don't
resonate at any frequency; they turn into lossy transmission lines at
GHz frequencies. Can be tricky to embody, as you found.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk