The blog of a dedicated radio amateur and electronics enthusiast

"Having fun on the air and in the workshop - communicating and creating"
Showing posts with label SMD. Show all posts
Showing posts with label SMD. Show all posts

17 September 2010

SMD soldering success

I have used the tools and materials described in my posting on 20th August to solder successfully in place the frequency synthesiser chip, ( encircled in the picture ); an amazing result, considering it was the first SMT component I had ever attempted to solder, ( since being properly equipped ), and I had only 'perfected' my technique on a scrap piece of circuit board a few moments earlier !
The chip is Analog Devices Inc. 50MHz CMOS complete direct digital synthesiser type AD9835 which measures 5.1mm x 4.5mm and has 8 connection pins on each of the two longer sides to be soldered.
The mixture of 'through hole mounted' components and SMD on the same board is convenient and acceptable for prototyping. With this first SMD soldering success behind me I shall, in time, convert the circuit board completely to SMT in a future version.
Now let me see if the code I have written, ( see 17th May ), to control the chip will actually get it to do what I want.

20 August 2010

ESD and SMD

Many modern electronic components are vulnerable to electrostatic discharge, ESD, and may also be miniscule surface mount devices, SMD, ( typically with dimensions of only a few hundredths of an inch ), for circuit boards using surface mount technology, SMT. The synthesiser chip, which I referred to on 17th May, is both. Since then I have assembled the necessary tools, materials and aids to work successfully with such components.
On the heat-resistant anti-static work mat I've placed some other ESD accessories; wrist-strap, anti-static brush and earth plug.
For soldering and handling I have a 48 watt temperature controlled soldering iron, tips with sub-millimetre pointed ends, 0.38, 0.56 and 0.70mm diameter solder, solder-wick ( size AB ), liquid flux, solder paste, iso-propyle alcohol for cleaning off flux residue, tweezers and a swivel mounted vice. Regarding the vice, mine has a groove along the length of the jaws, making it ideal for holding circuit boards.
Obviously it is fundamental to be able to see the SMT components properly. So to help me in this regard, and also for inspecting my work, I've collected various types of optical aids, handheld and hands-free, with magnifications from x1.5 to x20. The adjustable 2.5 watt LED light will illuminate the work surface without too much glare or shadow.
All that is now left to chance is a steady hand !