[time-nuts] low noise multiplication to 100 MHz
EWKehren at aol.com
EWKehren at aol.com
Tue Jan 26 15:17:23 UTC 2016
Thank you for your advice, I will print it out and when needed experiment.
We use SMD.s and two of our tem members are very good at it, I do limited
stuff and have some tools but also a macular hole in one eye. In designs I
try to stay with solder able SMD's and we have projects like the AD9913
which gets to the limit what I will consider. I did not do the soldering.
In a message dated 1/26/2016 10:00:51 A.M. Eastern Standard Time,
cfharris at erols.com writes:
I have noticed that if I have the right magnification,
I can do amazing things. Even the tiny age related
tremors that naturally occur in my hands reduce with
magnification. The brain is a marvelous servo mechanism.
Get a good 40x-80x zoom stereo microscope meant for
dissection, the type mounted on a boom, and I would bet
you too could deal with the small surface mount parts.
When I build with SMD, I always put all of the parts on
the top side, and use solder paste. I used to put lots
of tiny dots out with a syringe that works a lot like a
caulking gun... only smaller. But I found that simply
drawing a thin stripe of paste across the SMD pads
on the board, and then setting the part on the paste,
works just fine. The solder draws towards the pads, and
leaves the space between the pins clear. Occasionally
there will be some tiny balls sitting between the pins,
but they clean up when I clean the board with alcohol
and a brush...not that they hurt anything anyway.
The chips self center while they are floating on the
molten solder. No need to touch them with a soldering
iron, or anything else.
I use a lab grade hot plate to bring the board up to reflow
temperature. And I am off to the races.
For disassembly, I use an IR underboard heater, and a
hot air source... about 1/8 inch diameter, and move it
around the pin area until it melts, and then lift the
To put parts on an already populated board, I pre heat
the underside of the board to about 1/2-2/3 the way to
the solder melting temperature, and use a little gentle
hot air source to head the pads the rest of the way to
molten. No need for soldering irons.
Practice on junk boards until it becomes natural.
Bert Kehren via time-nuts wrote:
> We have looked at the LMK devices but with my 74 years would not try to
> solder it. There are other neat parts out there but again who is able to
> solder them.
> Bert Kehren
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