Through Hole vs. Surface Mount
in [Design]
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From: Robert Baer on 31 Mar 2010 17:48 Archimedes' Lever wrote: > On Tue, 30 Mar 2010 09:42:05 -0700, Joerg <invalid(a)invalid.invalid> > wrote: > >> All I can tell you is that there is no glop. I just did a few more >> solder joints and held them under a magnifier -> nada, zilch, clean. >> >> Maybe you used the wrong temperature? My Weller is running at 640F right >> now. > > > Most 'no-clean' hand operations I ever saw left the perfectly formed > solder joint encapsulated in a thin flux film. Are you sure that you are > not just too old or too non-detail oriented to 'see' it, even though it > is there? > > The flux does not evaporate, and is, by design, meant to remain, so it > *has* to be there... literally. Check! That is the glop i was talking about.
From: John Devereux on 31 Mar 2010 04:59 Joerg <invalid(a)invalid.invalid> writes: > Archimedes' Lever wrote: >> On Tue, 30 Mar 2010 09:42:05 -0700, Joerg <invalid(a)invalid.invalid> >> wrote: >> >>> All I can tell you is that there is no glop. I just did a few more >>> solder joints and held them under a magnifier -> nada, zilch, >>> clean. >>> >>> Maybe you used the wrong temperature? My Weller is running at 640F >>> right now. >> >> >> Most 'no-clean' hand operations I ever saw left the perfectly formed >> solder joint encapsulated in a thin flux film. Are you sure that you are >> not just too old or too non-detail oriented to 'see' it, even though it >> is there? >> >> The flux does not evaporate, and is, by design, meant to remain, so it >> *has* to be there... literally. > > > Ok, but it hasn't corroded or otherwise tainted one lone solder joint > in years. If it does cause a failure 300 years down the road I think I > could live with that :-) We use it for everything, never had a problem either. I take "no-clean" to mean "do not clean". I have heard (here) of problems when cleaning is attempted, the insulating component is washed away leaving an ionic residue which can absorb water and conduct. Or something. -- John Devereux
From: Nial Stewart on 31 Mar 2010 05:51 > I agree! > I personally don't understand why ANYONE would want to make their own > circuit boards. > There must be some level of satisfaction in rolling your own, but not > for me. One advantage is being able to knock up a simple board to try something _now_ (or in a couple of hours) rather than in three days, but this is only really applicable to small hacks. Other than that it's not worth the hassle. Nial
From: JosephKK on 31 Mar 2010 14:33 On Mon, 29 Mar 2010 08:22:07 -0700 (PDT), mpm <mpmillard(a)aol.com> wrote: >On Mar 29, 9:10 am, "Tim Williams" <tmoran...(a)charter.net> wrote: >> "mpm" <mpmill...(a)aol.com> wrote in message >> >> news:3c2cb2d5-5c26-496d-8de8-abc5392f8269(a)z4g2000yqa.googlegroups.com... >> >> > One mis-step, and you've potentially ruined hours worth of work, only >> > to start all over again. >> > Plus, after you're purchased the bare copper boards, the checmials, >> > the drills, and include your time -- it costs way more than the cheap >> > PCB houses. >> > With the latter giving you near perfect boards most of the time, on 2 >> > or 3 day turns, for $50 or so, and some even include the >> > silkscreening. >> >> The chemicals are practically free. Muriatic acid $5 at the hardware store. >> Acetone $5. You could get about a hundred boards from each, the cost per >> board doesn't even count. You'll spend more on the transfer paper. >> >> As a student, I don't have $50 to spare, nor is my time worth more than $50 >> for the same. It makes sense to make my own boards. >> >> There is one more advantage you missed. I also get them same day, a service >> you'd be charged many times the list price from a commercial supplier. >> >> Tim >> >> -- >> Deep Friar: a very philosophical monk. >> Website:http://webpages.charter.net/dawill/tmoranwms > >That's a fair statement. Several, in fact. >I was a student myself the last time I went the DIY route. >Perhaps it is a rite of passage? :) > >Never again though. I think that it kind of is, it really does separate the ones who love electronics from the "ticket to a high paying job" types. Of course there are those in between as well.
From: Tim Williams on 31 Mar 2010 14:33
"Tim Williams" <tmoranwms(a)charter.net> wrote in message news:hoot3i$n54$1(a)news.eternal-september.org... > I've got a school project which, like most of my stuff, is through hole, > but I cheaped out on gate drivers and went with complementary MOSFETs > instead. They only come in SO-8, of course: > http://myweb.msoe.edu/williamstm/Images/EE409_PWM1.jpg > Way easier than laminating two sides that don't line up, then drilling > cockeyed holes. And here's the stuff soldered down: http://myweb.msoe.edu/williamstm/Images/EE409_PWM3.jpg Nope, no SMT caps. I'll stock up some day, but at the moment I can't justify buying all the resistors and caps and diodes and transistors I'd need to build complete SMT circuits. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |