Specifications

ManualsBrandsBoss Audio Systems ManualsAutomotiveCAP20

GENERAL

INSTRUCTIONS

The section of

the

manual beginning with this page is the CONSTRUCTION

section.

All pages in this section have page numbers followed by

"C"

(lC,

2C,

etc.).

The INSTRUCTION

section

resumes on the pages following the

CONSTRUCTION

section.

Note

thot

the CONSTRUCTION section is

located

centrally

in the book and may be removed without desrupting the INSTRUC-

TION section

that

both precedes it ond follows

it.

Care

taken in the construction of this instrument will reward the constructor

with many years of satisfactory

service

and

greater

confidence

in his instrument.

We urge you to

not

rush the

construction,

but to

take

all the time necessary

for proper assembly and wiring.

Furthermore, we urge strongly

that

you follow

the

wire and parts layout shown

in the pictorial diagrams as

closely

as possible. Very often wires

are

placed

as shown for a good reason, and

certainly

the

appearance

of the completed

Instrument will be improved and the

difficulty

of finding a wiring error wi II be

reduced by the following the wire and ports layout shown.

UNPACKING

THE

KIT: Unpack the

kit

carefully

and

check

each

part

against

the parts Iist IncIuding those parts

that

are

mounted to the chassis. If you have

trouble identifying any parts refer to

the

pictorial diagrams or the

color

code

chart.

You will find

that

the

value

of a component will vary within the

allowable

circuit

tolerance.

For

example,

the

4.7KO,

±10%resistor

may measure

any-

where between

4.2KO

and

5.2KO.

Tolerances on paper

capacitors

are

sub-

stantially

greater,

and

the

tolerance

for

electrolytics

is usually +100% and

-50%.

CONSTRUCTION HINTS: USE

THE

BEST

GRADE OF ROSIN CORE

SOLDER

ONLY,

preferably one

containing

the new

activated

fluxes such as Kester

"Resin-Five",

Ersin

"Multicore"

or similartypes. UNDER

CIRCUMSTAN-

CES USE ACID CORE

SOLDER

OR ACID

FLUX

since

acid

flux

can

cause

se-

rious corrosion. Before soldering make a

certain

of a good mechanical

con-

nection.

Use a

clean,

freshly tinned soldering iron, no smaller than 100

watts,

and

place

the solder on the joint (not on the iron)so

that

the solder Is melted

by the

heat

from the joint

itself.

Do not remove the soldering Iron until the

solder flows and

check

see

that

the

resul ting joint is smooth and shiny when

the solder has

cooled.

There

are

two extremes to be avoided; too

little

heat

and too much

heat.

If too

little

heat

supplied,

the joint will

appear

pitted

and

grey,

Indicating a rosin

joint

which is unsatisfactory. On the

other

hand,

If too much

heat

is appl ied to a

joint,

the parts

connected

may

either

change

value,

loose

their

protective

coating,

or break down . If you

are

sol-

dering close to a

part,

hold

the

lead between

the

part

and

the

joint being

sol-

dered with the tip of 0

pair

of longnose pliers . The pliers will

conduct

the

heot away and

prevent

the component from being unduly

overheated.

If for

any reason it Is necessary to resolder a

joint,

be sure to use new

solder.

It should also be noted

that

the leads on resistors,

capacitors,

and transformers

are

often longer than

required.

These leads should be trimmed to the proper

length when necessary . Do not

cut

any lead until you have

determined

the

required length when

the

lead is routed as shown in the diagrams.

BASIC

TOOLS

REQUIRED

: These basic tools

are

required for

the

construction

of the amplifier.

1. Screwdriver -

3/16"

1/4"

blade

Screwdriver -

1/8"

blade

Longnose piiers - 5 or 6"

Diagonal cutters

Soldering iron (100

watts),

or soldergun, or pencil iron (35 watts)

Gas pliers

7. High

quality

rosin or

equivalent

synthetic

flux

core

solder.

Do..!!2! use

acid

or paste flux under any circumstances.

A set of spintites and a wire stripper

are

also very useful supplementary tools.

PARTS

IDENTIFICATION: Please

note

that

very many of the parts for which

color

coding is given

maynotbe

color

coded,

but

have

their values and ratings

printed.

The

letter

K is a multiplier(X1000) and on resistors or

capacitors

in-

dicates

that

the printed numerical

value

must be multiplied by

one

thousand

obtain

the

value

in ohms or micro-micro farads

respectively.

Note

also

that

one microfarad (mf) is

equal

one

million; micro-microfarads (mmf). To aid

in rapid

identificotion,

keep

in mind

that

5%,

10%,

and 20% resistors

are

color

coded whereas 1% resistor have

their

values printed; also

that

molded

tubular

capacitors

mayor

may not be

color

coded,

whereas disc

capacitors

and

electrolytics

will always

have

their

values

printed.

Please

note

the

following

relationships

between

the units used to express resistance or

capacity.

1,000,000

ohms

(0)

=1000 kilohms (KO) = I megohm (MO)

1,000,000

micro-micro farads (mmf) = 1 micro farads (mf)

CONSTRUCTION

PROCEDURE:

The

complete

step-by-step

mounting and

wir-

ing procedure follows. To

keep

thedrawingsuncrowded

, unnecessary

repetition

of mounting or wiring

details

may be omitted.

Note:

The

abbreviation

(!=)

means

connect

but do not solder (until

other

leads have

been

connected)

. The

abbreviation

(S) means

connect

and solder.

Bend the ground lug tabs on

the

sockets toward the chassis to

prevent

acciden-

tal shorting to

the

socket

pins.