MOTM

Kester Flux #331, 0.020 diameter. I buy it from Allied.

Paul S.

----- Original Message -----
From: J. Larry Hendry <jlarryh@...>
To: <motm@onelist.com>
Sent: Saturday, November 20, 1999 11:31 PM
Subject: Re: [motm] Electrolytic Cap Placement & Solder


> From: "J. Larry Hendry" <jlarryh@...>
>
> Speaking of solder.....  Paul what solder do you buy for "organic?"  Since
> I know you are Mr. Mouser, I bet you have a Mouser page number or part
> number for it.
>
> Thanks,
> LH
>
>
> > From: "Paul Schreiber" <synth1@...>
> >
> > There are two reasons MOTM does not use rosin core solder (in fact, no
> one
> > has used rosin-core solder
> > *in mass production* since about 1990).
> >
> > #1 - rosin is designed to *attract moisture* (think of the rosin bag in
> > baseball, and in gymnastics). Attracting
> > moisture in *NOT* what we want in synths! Especially VCOs.
> >
> > #2 - in order to *remove* the rosin off the boards, you need *horribly
> > messy* chemicals. Freon was the older
> > choice. There are spray cans of non-CFC rosin flux remover, but my
> > experience is that this makes a huge
> > mess because all you do is dissolve the flux and coat the whole pcb with
> it!
> > In production lines in the '70s/'80s
> > there were massive, high-power water jets that 'scrubbed' the flux off
> with
> > 150 psi water nozzels after a good old Freon
> > bath (the boards were actually immersed in liquid Freon).
> >
> > Today, *all* soldering is using "No Clean" flux.
> >
> > So, a fair question is :"Why not use No Clean everywhere?"
> >
> > The answer is that I felt that No Clean is harder to solder, and that
> > organic *still* has the best overall
> > joint construction. The only reason No Clean replaced organic is that
the
> > manufacturers saved millions
> > of dollars on water bills (and floor space!).
> >
> > Paul S.
>
> >