Zhelezyaki - independent production of printed circuit boards.

(c) 2002 Corvax/AREAsoft                 
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 And the next part will help you with camoc-
careful production of printed circuit boards.
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  You have chosen a certain scheme, selected the necessary
required elements, debugged the operation of the circuit
on the circuit board, can be assembled.  But
This is where the main problem arises for those who
iron-on - no ready-made printed
fees. Of course, you can leave everything on the mon-
car, surrounded by a bunch of wires, but beam-
Still, be patient and do it
the printed circuit board yourself.                   
  First of all, you need to make a drawing of the
chat fee 2:1.  To do this, on paper with
grid step Smm (turn
notebook sheet) apply the placement of de-
hoists and their connection diagram.  Please pay
attention, the centers of future holes under
the pins of the elements will be located in the nodes
coordinate grid - at the intersection of the
ny.  Mark the centers of the holes in black.
color, connecting conductors - blue
with it, draw symbolic images with a pencil
effects of the elements. Then turn the sheet over
and on the reverse side mark: black
color - centers of holes, red - co-
connecting conductors. If the board has
tanovlenyjumpers, they are designated by point-
dash line.                           
  This marking will help you easily identify
get involved.                            
  When making a PCB drawing
adhere to the following rules:        
  1. Connecting conductors must
have the minimum possible length.        
  2. If the drawing is single-sided printed
This board has more than 10 jumpers -
proceed to designing a double-sided
boards.                                   
  3. Power buses must have maximum
but possible width.                     
  4. Try not to conduct parallel
at a short distance several wires
nicknames                                   
                                         
  To create PCB drawings using
SPECCY you can use a special
program likeLAYOUT. The best pro-
ha, what I came across is - "Platarus
v.3".                                    
                                         
  So, the printed circuit board drawing is ready, it
dimensions are known.  According to them from foil-
of the material, we cut out the workpiece and
using silicate glue we glue the paper with
grid pitch 2.5 mm.  If
the board is one-sided, we glue the paper with
sides of foildouble-sided - with any.
Then, according to the drawing, we mark on the grid
centers of future holes and hakephum.  Te-
you can first remove the paper with warm water and
drill holes.                   
                                         
  The next stage is surface preparation
boards for drawing.               
  Place the workpiece on low for 3-5 minutes.
ferric chloride solution (10 g chlorine
iron per 100 ml of water). Then, taking payment
by the ends, rinse it thoroughly under running water
l water and dry.  Touch the
bepxhoctu boards are not allowed - for sealed ones
areas will not be covered with a protective coating.      
  When the board is dry, use a heatfeeder or
use a pen to draw a drawing of the conductors, indicating
marked on the drawing in red. Better
just use leave-in mascara
("Squid", "Hummingbird"). You can use
use hutpo- or oil paints, bi-
dark varnish.  But remember, the first ones are easy
“chip”, and the latter take a long time to dry.
After drying, the drawing is retouched - successfully
There are drips, drops, and random jumpers.
Do this with a scalpel or sharpened
with a knife, for example, made from linen
from a hacksaw for iron.                    
  There is another method of applying ri-
cyhka conductors on the printed circuit board, with
using a PC and a laser printer.          
  Mirror image of the board drawing
printed onlaser printer in
high-quality printing, in two passes. Pre-
It is necessary to change the settings first, so
the drawing would be printed on paper exactly
1:1.  Then we take this sheet and apply
onto foil and iron with a hot iron,
so that the ink from the paper is printed onto
fee.                                   
                                         
  Then, foil side down,
it is immersed in a solution of ferric chloride
(75 g of ferric chloride per 100 ml of water).
Its lower surface should be in
10-15 mm from the bottom of the vessel. Insert 4-6 spi-
check into the holes intended for
mount the board so that they protrude from
bottom side by this amount.  They pos-
they puddle with racks.  Double sided board is better
place vertically.                  
  The healing lasts depending on the
solution saturation, from 30 minutes to 2 hours
owls But if there is a belt on the surface of the solution
a whitish film curled up, use it
it is impossible.                                  
  After etching, rinse the plate thoroughly
that in running water, rinse with solvent
protective coating, rinse again, dry
sew and cover with cnupto-rosin flux
catfish  If the board is double-sided, then you need
make metallization of holes. It's possible
make using honey cleaned from varnish
thin wire with a thickness of 0.2-0.3 mm. Now,
Having irradiated the contact pads, you can applytynatb for installing parts.              
  I wish everyone good luck in this difficult pop-
food!