OT: SMT kits?

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Re: OT: SMT kits?

Bill W4ZV
        Richard, I already sent you my comments directly
as you requested, but feel I should respond to some of the
comments posted here.

        By way of background, the only SMT parts I had used
previously were mounting 5 SMT caps on an Inrad roofing filter
kit for my Orion.  That went well so I began looking for another
SMT kit to try.  I decided to try KD1JV's AT Sprint II which is
described here:

http://www.al7fs.us/AL7FS5ATSprint2.html

The ATS-2 is a quasi-competitor to the KX1 in that it covers
80/40/30/20 and comes in a very small lightweight package
for $205 shipped.  I was particularly interested in the weight
since I've gotten interested in the Adventure Radio Society's
Spartan Sprints, which place a premium on weight.  My ATS-2
including paddle, earphones, modules for 80/40/20 and a 9V
battery (good for 2.5W for the 2 hour Sprint duration) altogether
weighs 0.59 pounds.  Steve KD1JV has now ended production
of the ATS-2 in favor of an ATS-3 which should be even lighter!

        Construction was really a non-event and it was actually
fun to build.  I was initially worried about the AD9834 DDS chip
which has extremely small leads but even that was no problem.
The only trick to SMT is to use the proper tools--a magnifying
visor (I got one for $4.95 plus shipping), 0.015" solder and a needle
point tip on a standard solder station (mine is the $35 Circuit
Specialists version) are the only musts .  Special SMT soldering
equipment is NOT needed.  I also did NOT use any hold-down
device although it is very easy to construct one with several web
references (one on AL7FS's site above).

        Bottom line for me:  SMT is nothing to be afraid of if you
use the proper tools (which are neither expensive or specialized).
I'm now just waiting for KD1JV to bring out his ATS-3 and get my
weight down WELL below 0.5 pounds for more Spartan Sprints.

                                73,  Bill  W4ZV  (K2 #4119)

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Re: OT: SMT kits?

Larry Makoski W2LJ
In reply to this post by John Payne-5
A "trick" that I learned was to take a long piece of solid "bell wire"
or hookup wire (copper) about 6- 8 inches long.  Remove the insulation
and wrap a coil around your soldering iron tip.  Bring the last bit of
wire out, parallel to the axix of the soldering iron. Plug the iron, in,
let the wire heat up, cut the "tip" to the length you want and you have
a very fine tip for soldering SMD devices.

I wouldn't want to build a kit this way; but if you only have a couple
devices to solder it works pretty good.

73 de Larry W2LJ - Vivat Morse! © ®

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----- Original Message -----

John Payne wrote:

> Who needs an expensive "soldering station" for SMT?  I've built a
couple of
> SMT projects with a standard soldering station (using a fine tip)with
no
> problem.  If one looks for excuses, one can find them, and never do or
learn
> anything new!  There are many cheap and easy tricks for SMT work, if
one
> only cares to look a bit!
>
> 73 de John N4FLJ



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Re: OT: SMT kits?

Sandy W5TVW
In reply to this post by John Payne-5
I have an old Ungar "Princess" that might work?  Someday I mat try SMD
out, but I suspect I'll sooner or later drop some parts and probably never find them!
73,
Sandy W5TVW
----- Original Message -----
From: "John Payne" <[hidden email]>
To: "Sandy W5TVW" <[hidden email]>; "Frank C Van Cleef" <[hidden email]>;
<[hidden email]>
Sent: Tuesday, August 10, 2004 5:12 PM
Subject: Re: [Elecraft] OT: SMT kits?


| Who needs an expensive "soldering station" for SMT?  I've built a couple of
| SMT projects with a standard soldering station (using a fine tip)with no
| problem.  If one looks for excuses, one can find them, and never do or learn
| anything new!  There are many cheap and easy tricks for SMT work, if one
| only cares to look a bit!
|
| 73 de John N4FLJ
| ----- Original Message -----
| From: "Sandy W5TVW" <[hidden email]>
|
|
|
| > One "reason" I don't care with SMD stuff, is the cost of "proper"
| soldering gear for
| > them!  > Big smile ;^)
| >
|
|
|

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Re: OT: SMT kits?

Sandy W5TVW
In reply to this post by Mike Morrow-3
As I said, I think the "soldering" part would be the least bothersome part of
assembling SMD board.  (PROVIDED...the assembler KNOWS HOW to solder!...
this was one of the BIGGEST problems I encountered fixing Heathkit stuff
other people put together.  Some looked like they used a heated mail for a soldering
iron!)
The biggest problem would be positioning and handling the components!
At least I think this would be the "kink" for people who KNOW how to
solder correctly!

73,
Sandy W5TVW
----- Original Message -----
From: "Mike Morrow" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, August 10, 2004 5:22 PM
Subject: Re: [Elecraft] OT: SMT kits?


| I wrote:
|
| >> SMT construction is specifically designed *only*  for machine
| >> assembly.  IMO, any SMT kit must come with almost all the SMT
| >> components pre-assembled to the PC boards to be acceptable.
|
| To which Blake responded:
|
| >Misinformation.
|
| The fact that some humans can manage to assemble some SMT components with varying
degrees of inconvenience does *not* alter the fact that SMT component packages *are*
designed first and foremost to facilitate machine assembly.  No designer of an SMT
component package ever sat down and added "ease of human manual assembly" to the list
of design criteria he had to meet.
|
| The second sentence began with "IMO" ("in my opinion").  An opinion expressing
personal preference is not "misinformation."  It *is* a fact that a manually
assembled SMT kit is unacceptable to me (and many many other likely kit builders).
|
| > I like SMT much better...  No board flipping and lead clipping.
|
| I'll accept that as a statement of personal preference.  Otherwise I might make the
same mistake and write "Misinformation!"
|
| 73
| Mike / KK5F
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|

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RE: SMT kits and Elecraft

John A. Ross [RSDTV]
In reply to this post by Ron D'Eau Claire-2
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Ron
> D'Eau Claire
> Sent: Tuesday, August 10, 2004 11:34 PM
> To: 'Elecraft Mail list'
> Subject: RE: [Elecraft] SMT kits and Elecraft
>
> Wayne wrote:
> ...it can require
> a lot of practice, patience, steady nerves, unimpaired
> vision, and specialized tools.
> ---
>
> Good points, especially when it comes to identifying parts.
> My experience has been mostly in fixing something. I replace
> one or two SMDs and I'm done.
> But reading the identifying marks on some of them darn near
> requires a microscope!

Ron

You usually do not get identification marks on chip capacitors, melf/SOD80 diodes or SOT23 parts
(transistors etc)

This is what I see as the biggest issue to SMD kits as there is no visual way for the builder to
validate he has the correct parts in the correct place so its all down to getting these in the right
place first time. This might seem to contradict some of my earlier comments in some ways but of read
in context it only means you need to concentrate a little harder and employ a slightly different
methodology for the assembly of the 2 technologies.

I already know 1 builder who had some problems that ended up being a misplaced part, a very easy
thing to do.

The part size chosen for a kit will make a big difefrence in parts managability but will make the
inventory for compiling the kit for sale as you cannot sequence the parts as easily on tape as on a
bandolier.

John

> Building a whole rig from a box (or thimblefull) of 100 or
> 200 such devices might be a bit more of a challenge...
>
> Also, I cringe when I find a dense board mixed with
> through-hole stuff. The big parts almost always make it
> really tough and time-consuming to work with SMDs using
> simple, non-specialized tools.
>
> Ron AC7AC
>
>
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RE: SMT kits and Elecraft

Ron D'Eau Claire-2
In reply to this post by wayne burdick
Ouch! The stuff that I've see so far has numbers - but really, really,
REALLY small in many cases.

Ron AC7AC

-----Original Message-----
Ron

You usually do not get identification marks on chip capacitors, melf/SOD80
diodes or SOT23 parts (transistors etc)

This is what I see as the biggest issue to SMD kits as there is no visual
way for the builder to validate he has the correct parts in the correct
place so its all down to getting these in the right place first time.
John



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RE: SMT kits and Elecraft

John A. Ross [RSDTV]
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Ron
> D'Eau Claire
> Sent: Wednesday, August 11, 2004 1:25 AM
> To: 'Elecraft Mail list'
> Subject: RE: [Elecraft] SMT kits and Elecraft
>
> Ouch! The stuff that I've see so far has numbers - but
> really, really, REALLY small in many cases.

Ron

Yeah mostly chip resistors have numbers using standard conventions, except Rohm/Eurohm who can have
a really funky system, don't expect 102 to be 1K from some of these guys.

But MLC caps 1206 (3.2 x 1.6mm) and below are rarely marked, but depends on manufacturer, 0805 (2.0
x 1.25mm) have never had markings as far as I recall. These I would view as big passive parts,
excluding chip electrolytic/tantalums.

Was that your definition of small?, normally we use 0603 (1.6 x 0.8mm) or 0402 (1 x 0.5mm) every
day.

No metric comments please ;-), its an affliction but I am used to it.

John (GM1BSG)
 

> Ron AC7AC
>
> -----Original Message-----
> Ron
>
> You usually do not get identification marks on chip
> capacitors, melf/SOD80 diodes or SOT23 parts (transistors etc)
>
> This is what I see as the biggest issue to SMD kits as there
> is no visual way for the builder to validate he has the
> correct parts in the correct place so its all down to getting
> these in the right place first time.
> John
>
>
>
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RE: SMT kits and Elecraft

Ron D'Eau Claire-2
In reply to this post by wayne burdick
Nope. Those are smaller than anything I've used!

Yeah, I'm aware that many (most?) of the numbers I've seen have nothing to
do with any parts I.D. conventions that I know!

As a technical writer I work in metric all the time. I have to convert back
to English more than go the other way.

Most people here don't realize that the standard system of weights and
measures in the USA is metric. We converted by an act of Congress to Metric
over 100 years ago. The problem was that Congress didn't make the old
English system illegal. Still  wish they would <G>.

Never say an American can't be stubborn. (Lessee 3/32 inch times 9/16 inch
...ehhhhh...).  

Ron AC7AC

-----Original Message-----

Ron

Yeah mostly chip resistors have numbers using standard conventions, except
Rohm/Eurohm who can have a really funky system, don't expect 102 to be 1K
from some of these guys.

But MLC caps 1206 (3.2 x 1.6mm) and below are rarely marked, but depends on
manufacturer, 0805 (2.0 x 1.25mm) have never had markings as far as I
recall. These I would view as big passive parts, excluding chip
electrolytic/tantalums.

Was that your definition of small?, normally we use 0603 (1.6 x 0.8mm) or
0402 (1 x 0.5mm) every day.

No metric comments please ;-), its an affliction but I am used to it.

John (GM1BSG)
 


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RE: SMT kits and Elecraft

David Toepfer
I recall reading somehere a while ago that absolutely all precision
instruments/tools are fabricated in metric and the only thing that is english
is the labels and the specs which are all converted to english.  Perhaps this
was an exageration, but it seemed pretty authoritative at the time.

kb3ipe

dt
.

--- Ron D'Eau Claire <[hidden email]> wrote:

> Nope. Those are smaller than anything I've used!
>
> Yeah, I'm aware that many (most?) of the numbers I've seen have nothing to
> do with any parts I.D. conventions that I know!
>
> As a technical writer I work in metric all the time. I have to convert back
> to English more than go the other way.
>
> Most people here don't realize that the standard system of weights and
> measures in the USA is metric. We converted by an act of Congress to Metric
> over 100 years ago. The problem was that Congress didn't make the old
> English system illegal. Still  wish they would <G>.
>
> Never say an American can't be stubborn. (Lessee 3/32 inch times 9/16 inch
> ...ehhhhh...).  
>
> Ron AC7AC
>
> -----Original Message-----
>
> Ron
>
> Yeah mostly chip resistors have numbers using standard conventions, except
> Rohm/Eurohm who can have a really funky system, don't expect 102 to be 1K
> from some of these guys.
>
> But MLC caps 1206 (3.2 x 1.6mm) and below are rarely marked, but depends on
> manufacturer, 0805 (2.0 x 1.25mm) have never had markings as far as I
> recall. These I would view as big passive parts, excluding chip
> electrolytic/tantalums.
>
> Was that your definition of small?, normally we use 0603 (1.6 x 0.8mm) or
> 0402 (1 x 0.5mm) every day.
>
> No metric comments please ;-), its an affliction but I am used to it.
>
> John (GM1BSG)
>  
>
>
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Re: SMT kits and Elecraft

Bob Nielsen
In reply to this post by Ron D'Eau Claire-2
On Tue, Aug 10, 2004 at 07:15:01PM -0700, Ron D'Eau Claire wrote:

> Nope. Those are smaller than anything I've used!
>
> Yeah, I'm aware that many (most?) of the numbers I've seen have nothing to
> do with any parts I.D. conventions that I know!
>
> As a technical writer I work in metric all the time. I have to convert back
> to English more than go the other way.
>
> Most people here don't realize that the standard system of weights and
> measures in the USA is metric. We converted by an act of Congress to Metric
> over 100 years ago. The problem was that Congress didn't make the old
> English system illegal. Still  wish they would <G>.

Me too.  I recall hearing that Jefferson proposed it in the early years
of this country, but was unable to push it through.  One Interstate
(I-19 in Arizona) has metric signage, however.

>
> Never say an American can't be stubborn. (Lessee 3/32 inch times 9/16 inch
> ...ehhhhh...).  

I thought it somewhat amusing that the Brits still use miles, although
they have converted most other things (except for Imperial pints of
beer, of course).

Bob, N7XY

 
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Re: SMT kits and Elecraft

Mario Lorenz
In reply to this post by wayne burdick
Am 10. Aug 2004, um 14:04:49 schrieb wayne burdick:
> Regarding SMT (surface-mount technology):
>
> We will obviously have to use many more SMDs (surface-mount devices) in
> future kits. But they will all be pre-installed, with rare exceptions.

Wayne, would you then please consider selling the bare PCB and the SMD
parts as an extra option? Look, I'm young, I'm a fool, and I actually do
have fun soldering SMD...

Mario

--
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                                        Ham Radio:   DL5MLO@OK0PKL.#BOH.CZE.EU
* This virus needs Windows95 to run!
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Re: SMT kits and Elecraft

Bob Baxter
In reply to this post by David Toepfer

----- Original Message -----
From: "David Toepfer" <[hidden email]>



> I recall reading somehere a while ago that absolutely all precision
> instruments/tools are fabricated in metric and the only thing that is
english
> is the labels and the specs which are all converted to english.

Have you checked your car?  95% of the nuts and bolts in my 88 Chevrolet,
made in Texas, were metric.

Bob Baxter AA7EQ
Bisbee, Az.


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Re: SMT kits and Elecraft

David Toepfer
Everyone seems to be missing my point, which is, all of these things are
designed and fabricated in metric specs.  The machine tools are made in
factories to metric specs, but when the but the dials on them or the labels on
them they are converted to english so we sad american masses who just cant/wont
work in metrics can understand.  I can, for example, make a 1/2" bolt by
makeing it 12.7mm.  My point is, the machining specs are actually in metric,
but the end result is marketed and labeled in english.  If the US was not the
huge economic power house and consumer it was all of the rest of the
countries/companies of the world would not coddle us on issues like this as
they do.

dt
.

--- Bob Baxter <[hidden email]> wrote:

>
> ----- Original Message -----
> From: "David Toepfer" <[hidden email]>
>
>
>
> > I recall reading somehere a while ago that absolutely all precision
> > instruments/tools are fabricated in metric and the only thing that is
> english
> > is the labels and the specs which are all converted to english.
>
> Have you checked your car?  95% of the nuts and bolts in my 88 Chevrolet,
> made in Texas, were metric.
>
> Bob Baxter AA7EQ
> Bisbee, Az.
>
>
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Re: OT English/Metric

David Toepfer
Not that any of it really matters.

dt
.

--- David Toepfer <[hidden email]> wrote:

> Everyone seems to be missing my point, which is, all of these things are
> designed and fabricated in metric specs.  The machine tools are made in
> factories to metric specs, but when the but the dials on them or the labels
> on
> them they are converted to english so we sad american masses who just
> cant/wont
> work in metrics can understand.  I can, for example, make a 1/2" bolt by
> makeing it 12.7mm.  My point is, the machining specs are actually in metric,
> but the end result is marketed and labeled in english.  If the US was not the
> huge economic power house and consumer it was all of the rest of the
> countries/companies of the world would not coddle us on issues like this as
> they do.
>
> dt
> .
>
> --- Bob Baxter <[hidden email]> wrote:
> >
> > ----- Original Message -----
> > From: "David Toepfer" <[hidden email]>
> >
> >
> >
> > > I recall reading somehere a while ago that absolutely all precision
> > > instruments/tools are fabricated in metric and the only thing that is
> > english
> > > is the labels and the specs which are all converted to english.
> >
> > Have you checked your car?  95% of the nuts and bolts in my 88 Chevrolet,
> > made in Texas, were metric.
> >
> > Bob Baxter AA7EQ
> > Bisbee, Az.
> >
> >
> > _______________________________________________
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> >
>
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Re: SMT kits and Elecraft

Stuart Rohre
In reply to this post by wayne burdick
Yes,
I think we can do simple kits with 1206 parts with home hand tools and
possibly a hold down fixture home made.   In fact, that would be a great
"kit", a set of SMT sized tools:  Needle Nose pliers, light spring tweezer,
hold down device that would sit on desk and exert weight on a 1206 component
as you soldered it, Maybe a Spudgeon tool, or dental wide tip blade to apply
flux to hold 1206 as a "glue" until soldered, a roll of 0.01 low melting
point solder, and list of suggested fine tip irons, and desk magnifiers that
a ham could locally procure.

Or include an option of that rectangular desk magnifier with tube light I
have seen in some catalogs.
These tools might be along the lines of the SMT article in the last QRP
Homebrewer magazine, and any others you might think useful.

Also useful would be test leads to fit standard banana plug Fluke and other
import meters, but have real needle tips for SMT lead probing and test.
Regards and 72,
Stuart
K5KVH


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Re: OT: SMT kits?

Stuart Rohre
In reply to this post by Sandy W5TVW
SMT:
Actually, you can use your present soldering station if it is heat
controlled, and just get a smaller conical 750 degree tip for the Weller, or
Ungar lines.  For home use, this works for 1206 components well enough.  The
secret is to not apply heat too long, you are not soldering like you did
with leaded components and trying to melt a whole pad.  You are "tacking"
down the 1206 one end at a time after centering it on a pretinned pad.

A simple 25 watt iron could be used if you got or made a suitable tip of
copper.   A larger wattage iron might work well if you put a diode in series
with hot side of AC line to limit the voltage and thus wattage.

For simple projects, it is NOT necessary to use the hot air gun, or reflow
solder tank.
-Stuart
K5KVH


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Re: OT: SMT kits?

Stuart Rohre
In reply to this post by Sandy W5TVW
Sandy,
What kind of soldering station do you have now?

How about $5 to put you in SMD capable soldering set up?  Or maybe $10
outside, the cost of a proper tip if you have a heat controlled station now.
750 tips would do it, with the narrow end suited to 1206 pads.
73,
Stuart
K5KVH


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RE: SMT kits and Elecraft

Steve-292
In reply to this post by Ron D'Eau Claire-2
I would *love* to see an SMT version of the KX1.  Already, in a number of
places in the current kit, it would seem like an SMT bypass cap would fit
better than the leaded version!  And probably no more difficult to
fit/solder in place.

How 'bout an "SMT Option" on some kits?

73,
Steve
aa8af

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Re: SMT kits and Elecraft

Stuart Rohre
In reply to this post by John A. Ross [RSDTV]
For manual SMT parts, 1206 is a workable size:  0.12 in. by 0.06 in.
Stuart
K5KVH


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Re: OT: SMT kits?

Stuart Rohre
In reply to this post by Sandy W5TVW
Yes, the Princess line of irons with replaceable tips can be used for SMT.
Stuart
K5KVH


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