Ramsey Electronics BS1 Manual de Instruções descarregar pdf (Página 20)

SG7• 20

panel decal, it may be sprayed with a fast-drying clear acrylic or

urethane finish. Be sure to mask off the red lens window to avoid

covering it with spray.

BUILDING THE SG7 MICROWAVE OSCILLATOR:

Before beginning, study the PC board layout diagram on the next page.

Some parts are mounted completely on the top side while others have one

lead soldered to a strip on top and another passing through a hole for

soldering on the solid tinned side. Here are some general suggestions to

help assembly go as smoothly as possible:

1. Follow our suggested order of assembly. These steps are given to help

you mount components as smoothly and neatly as possible.

2. A surface-mounted part can be secured most easily if the area to which it

is to be soldered has been pre-tinned with enough solder to form a good

connection. Otherwise, you will find yourself needing three hands in some

cases.

3. Before soldering, it is best to do a careful test-fitting of the part, gently

bending each lead for a neat, precise fit, and then PRE-TRIM the leads

to their desired length. Your work will be much simpler, easier and neater

if you follow this procedure. (However, the connections made on the solid

tinned side should be trimmed after soldering.)

4. In all soldering to the solid tinned side of the board, use enough heat to let

the solder flow freely to form a shiny and solid connection.

5. For easy identification, some of the tinned traces on the top of the board

are identified by a double letter such as "AA".

6. Notice that C7, a .001µF SMT (Surface Mount Technology) chip

capacitor, has been pre-installed at the factory. Be careful when soldering

not to damage or dislodge it.

The first few steps are explained in greater detail to help you develop a

good technique for proceeding more quickly after making a good beginning.

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Ramsey Electronics BS1 Manual de Instruções Página 20