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SOIjDEluNG
Use care when mounting all components.
Use only rosin core solder (acid core solder is never used
in electronics work. ) A proper solder joint has just enough solder to cover the I.ound soldering pad
and about 1/16 inch of the lead passing through it.
There are two improper comections to beware of:
Using too little solder will sometimes result in a connection which appears to be soldered but actually
there is a layer of flux insulating the component lead from the solder bead.
This situation can be
cured by re-heating the joint and applying more solder.
If too much solder is used there is the danger
that a conducting bridge of excess solder will flow between adjacent circuit board conductors forming
a short circuit.
Unintentional solder bridges can be cleaned off by holding the board up-side down and
flowing the excess solder off onto a clean hot soldering iron.
Select a soldering iron with a small tip and a power rating not more than 35 watts.
Soldering guns are
completely unacceptable for assembling transistorized equipment because the large magnetic field they
generate can damage solid state components.
CIRCUIT BOARD ASSEMBLY
( )
Prepare for assembly by thoroughly cleaning the conductor side of the smaller "A" ciroult
board with a scouring cleanser.
Rinse the board with clear water and dry completely.
Solder each of the fixed resistors in place following the parts placement designators printed on the
circuit board and the assembly drawing figure 1.
Note that the fixed value resistors are Don-polarized
and may be mounted with either of their two leads in either Of the holes provided.
Cinch the resistors
in place prior to soldering by putting their leads through the holes and pushing them fil.mly against the
board; on the conductor side of the board bend the leads outward to about a 45° angle.
Clip off each
lead flush with the solder joint as the joint is made.
Save the lead clippings for use as jumpers in
later steps.
A
P
i
silverorgold-disregardthisband
DESIGNATION
COLOR CODE A-B-C
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-black-red
brown-black-red
brown-black-red
brown-black-red
brown-black-red
brown-black-red
blue-grey-yellow
orange-orange-yellow
red-red-yellow
orange-white-green
brown-black-green
red-red-green
brown-black-green
yellow-violet-I`ed
brown-green-orange
orange-orange-orange
brown-green-yellow
blue-grey-brown
brown-black-green
brown-black-orange
brown-black-brown
orange-orange-yellow
brown-green-orange
brown-black-red
brctwn-green-yellow
red-red-orange
yellow-violet-yellow
brown-black-green
orange-orange-orange
DESIGNATI0N
#ar: I;
VALUE
47K ..
1meg
1 meg ,
COLOR CODE A-B-C
yellow-violet-orange
brown-black-green
brown-black-green
6. 8K ................... blue-grey-red
10K...................brown-black-orange
Install the ceramic disk capacitors. Without exception the value will be marked on the body Of the
part.
DE sroNATio N
vA LUE
E=
. 001 mfd. oeramlc disk.
100 pf. ceramic diskik
. 05 mfd. ceramic disk
. 05 mid. ceranic disk
Up to this point all components have been ron-polarized and either lead could be placed in either of
the holes provided without affecting the operation of the circuit.
Electrolytic capacitors are polarized
and most be mounted so that the ''+ " lead of the capacitor goes through the ''+ " hole in the circuit
board.
In the event that the ''-'' lead of the capacitor is marked rather than the " + " lead it is to go
throngh the unmarked hole in the circuit board.
Note that the operating voltage (v. ) specified for a capacitor is the minimum acceptable rating.
Capacitors supplied with specffic kits may have a higher voltage rating than that specified and may
be used despite this difference.
For instance. a 100 mid. 25v. capacitor may be used in place of
a 100 mid. 10v. capacitor without affecting the operation Of the circuit.
Mount the following electrolytic capacitors and solder them in place.
The values, voltage rating and
polarization are marked on the body Of the part.
uH,?AI"::
u.
C5
VALUE
2. 2 mid. 10v. electrolytic
2. 2 mfd. 10v. electrolytic
hstall the transistors.
Orientation Of the transistors is keyed by the flat on the side of the case and
should be evident from inspection of the parts placement diagram shown in figure 1 and the parts
placement designators printed on the circuit board. All semi-conductors are heat sensitive and may
be damaged if allowed to get too hot during soldering.
To be on the safe side heat sink each transistor
lead during the soldering operation by grasping it with a pair of needle-nosed pliers at a point between
the circuit board and the body of the transistor.
The part type no. is printed on the case.
DESIGNATION
TYPE NO.
#,y
i:
2N5129
2N5129
2N5129
Install the diodes.
Note that these parts are polarized and must be properly oriented in order to
operate correctly.
Polarization of the diodes is indicated by a colored band on one end of the case.
Install as shown in figure 1.
The physical appearance Of the device is related to the schematic
symbol used on the circuit board parts placement designators in the drawing below.
DESIGNATION
(¥z
:i
TYPE NO.
|N914
|N914
Using the excess resistor leads clipped from resistor installation. form and install the
wire jumper indicated by the solid line printed on the circuit board and shown in the parts
placenien( diagrar.I figure 1,
Install the trin`mJ=r potf,ntiometer.
:?i.- .`
NATION
R37
VALUE
50K trimmer potentiometer
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