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HEATHKIT

RESISTANCE

SUBSTITUTION

BOX

MODEL

IN-12

SPECIFICATIONS

Range.

. . . . . . . . . .

..............

.

Power

Rating.

.

...........

.

Ac~uracy.

. . . . . .

.......

.

Voltage

Rating

.....................................

.

Dimensions

overall.

. . .

...........

.

Shipping

Weight.

. .

................................

.

Copyright

1963

Daystrom,

limited

15

ohms

to

10

megohms

1

watt

-

all

values

t 10%

RTMA

values

500

volts

(continuous

duty

all

values)

6"

long

x

3"

wide

x

3"

high.

3

lbs.

2/28/63

PRICE

11.00

,

HEATHKIT®

I'

.ASSE::M:ELY

::M:.A..NUAL

J

i

I

RESISTANCE

SUBSTITUTION

BOX

MODEL

IN-12

Page

2

~~•w*'*t'+*'

ASSEMBLY

AND

HEATHKIT RESISTANCE

OPERATION

OF

THE

SUBSTITUTION BOX IN-12

The

Heathkit

Resistance

Substitution

Box

provides

a

rapid

and

flexible

method

of

determining

resistance

values

when

working

on

electronic

circuits.

Its

usefulness

will

many

times

repay

a

little

extra

care

devoted

to

its

construction.

Upon

receiving

the

kit,

unpack

it

carefully

and

check

each

part

against

the

parts

list.

In

this

way

you

will

become

familiar

with

the

various

components

and

also

will

avoid

throwing

away

any

parts

with

the

packing

material.

NOTE:

ALL

GUARANTEES

ARE VOIDED AND WE

WILL

NOT

REPAIR

OR

SERVICE

INSTRUMENTS

IN

WHICH ACID

CORE

SOLDER

OR

PASTE

FLUXES

HAVE

BEEN

USED.

WHEN

IN

DOUBT ABOUT

SOLDER,

IT

IS

RECOMMENDED

THAT

A NEW

ROLL

PLAIN-

LY MARKED "ROSIN

CORE

RADIO

SOLDER"

BE

PURCHASED.

CONSTRUCTION

The

construction

of

this

kit

is

extremely

simple.

Reference

to

the

notes

below

should

prove

helpful

as

they

explain

the

method

which

was

found

to

be

most

convenient

for

wiring.

1.

Refer

to

the

detail

drawing

below

and

mount

the

terminals

to

the

panel.

Both

terminals

are

insulated

from

the

panel

with

fiber

washers.

Keep

the

solder

lugs

pointed

in

the

direction

shown

in

the

Pictorial.

Install

a

cap

on

each

terminal.

2.

Mount

the

SPDT

slide

switch

on

the

panel.

See

the

pictorial

for

proper

positioning

of

the

switch

lugs.

3.

The

major

portion

of

wiring

concerns

connecting

resistors

to

the

rotary

switches

and

fig-

ure

8

ring.

The

resistors

for

each

switch

group

should

be

first

identified

by

referring

to

the

color

code

chart

on

Page

4

and

then

arranged

in

logical

installation

sequence

so

that

they

can

be

readily

installed.

The

switch

leads

of

all

resistors

should

be

cut

so

that

a

maximum

length

of

3/8"

remains.

Do

not

cut

the

other

resistor

lead

at

this

time.

~

~

1110

',@',,

~

SMALL

GRO~emNHR

~

SETSCREW

CLIP

THE

POINTER

ONTO

THE

KNOB

OPPOSITE

THE

SETSCREW

AS

SHOWN.

15

16

SINGLE

2

INNER LUG

6

Page

3

4,

The

resistors

are

connected

to

the

rotary

switches

before

the

switches

are

mounted

on

the

panel.

One

switch

should

IJc

completely

wired

before

the

second

IS

started.

To

ht'ljl

in

getting

the

resistors

in

the

proper

sequence,

the

lugs

around

the

outl'r

edge(){

the

rutary

switches

should

be

regarded

as

numbered

in

the

manner

as

shown

111

the-

draw

in~.

The

SIII~

gle

inner

lug

of

the

switch

should

be

used

as

a

reference

starting-

point.

When.viewtng

the

switch

from

the

rear,

the

numberin~

system

should

be

visualized

as

counterl"luckwise,

starting

from

the

locating

inner

lug

with

the

lowest

resistance

value.

See

the

Chart

on

Page

4.

5.

Begin

the

actual

wiring

by

first

connecting

a

1-1/2"

wire

to

the

single

inner

lug.

sistor

lead

and

dressin~

the

lead

throu~h

the

switch

lur-:.

After

the

resistors

havc·

IH·c·n

n1ounted

on

one

switch,

proceed

to

wire

the

second

switch

in a

similar

n1anJH'L

Suldcr

connections.

6,

Mount

the

switches

on

the

panel

using

a

control

lockwasher

between

the

switch

and

panel.

The

switch

with

the

r-:roup

of

resistors

from

15K

to

10 mer-:ohms

should

be

located

nearest

the

two

terminals.

Position

the

switches

so

that

the

sin~le

1nner

lur-:s

are

as

shown

111

the

pictorial.

KEEP

TOTAL HEIGHT

BE)..OW

DIMENSION

INSURE

PROPER

FIT

IN

THE CABINET SHOWN TO

WIRE

RING)'

WIRING

PICTORIAL

7.

Slip

the

figure

8

wire

ring

over

the

leads

of

the

resistors

so

that

the

resistor

leads

are

in-

side

of

each

of

the

figure

8

loops.

The

loops

should

be

pushed

close

to

the

res1stor

bodies

and

then

the

leads

bent

partially

around

the

wire

loops

so

as

to

make

a

good

mechcullcal

joint.

Flow

solder

smoothly

over

each

joint

and

trim

off

excess

resistor

lead,,.

8.

Following

the

pictorial,

connect

the

two

wire

leads

from

the

rotary

switches

to

the

proper

lugs

on

the

SPDT

switch,

a

wire

from

the

figure

8

ring

to

the

input

terminal

shown,

a le-ad

from

the

center

lug

on

the

SPDT

switch

to

the

other

input

terminal.

9.

Refer

to

the

knob

preparation

detail

and

snap

the

knob

pointers

onto

the

knobs

as

shown.

10.

The

knobs

should

now

be

put

on

the

switch

shafts

so

that

they

index

properly.

One

easy

method,

which

does

not

require

measuring

equipment,

is

to

look

at

the

edge

of

the

rotary

switch

and

note

the

setting

of

switch

lug;

contact

wiper.

It

can

easily

be

spotted

if

the

shaft

is

rotated.

For

example,

if

the

wiper

is

in

contact

with

the

lug

on

which

the

6.8

me~ohm

resistor

is

mounted,

set

the

pointer

to

the

6,8

megohm

panel

marking

and

then

tighten

the

knob

setscrew.

This

procedure

should

be

followed

for

the

mounting

of

both

knobs.

11.

Place

the

entire

assembly

in

the

cabinet,

run

the

four

long

screws

through

the

panel

and

tighten

them

so

as

to

hold

the

assembly

firmly

i11

place.

This

completes

constructic.n

<)[

the

kit.

Page

4

I~

Wf§jiif¥*£+1

CH.-\RT

:\0.

1

RA!':GE

15

to

10K CHA.RT

:\0.

2

RA!\GE

15K

to

10

Me~.

S'.\

itl'il

Sw1tcil

P(1sitiun

Value

Color

Code

PositJUn

Value

Color

Code

15

Brown

Green

Black

1 15 K

Brown

Green

Orange

~

22

Red Red

!3lack

2

22

K

Red

Red

Oran~.e

.l

33

Oran~e

Oran~e

Black

3 33 K

Orange Orange Orange

l

17

Yellow

Vwlct

Black

4

47K

Yellow

Violet

Oran"'e

68

Blue

Grr•y

13lack 5

G8

K

Blue

Grey

Orange

6 100

3rown

Black

Brown

6 100 K

Brown

13lack

Yellow

150

Brown

Green

Brown

7 150 K

Brown

Green

Yellow

8

220

Hed

Red

Brown

8

220

K

Red Red

Yellow

9 330

Orange

Orange

Brown

9

330

K

Orange

Orange

Yellow

10

470

Yellow

Violet

Brown

10 470 K

Yellow

Violet

Yellow

11

680 Blue•

Grey

Brown

11

680 K

Blue

Grey

Yellow

12

1000

Brown

Black

Red

12

1

Meg.

Brown

Black

Green

1.3

1500

Brown

Green

Red

13

1

.5

Meg.

Brown

Green

Green

1~

2200

Red Red Red

14

2 2

Meg.

Red

Red

Green

15

3300

Oran~e

Oran~e

Red

15

3.3

Me~.

Orange

Orange

Green

16

4700

Yellow

Violet

Red

16 4. 7

Me~.

Yellow

Violet

Green

17

6800

Blue

Griey

Red

17

6.8

Meg.

Blue

Grey

Green

18

10,000

Browli

Black

Orange

18 10

Meg.

Brown

Black

Blue

APPLICATIONS

In

radio

or

television

service

work,

the

Heathkit

Resistance

Substitution

Box

will

prove

uf

~rcat

assistance

in

experimentally

determinin[>;

the

desired

value

of

a

charred

or

unmarked

resistor

through

temporary

sulJstitution.

It

can

also

lJe

substituted

for

any

resistor

in

a

radio

circuit

so

that

the

value

of

the

resistor

may

be

changed

durin.,;

operation

in

order

to

determine

the

desired

resistance

value

that

will

provide

maximum

circuit

performance.

No

attempt

will

be

made

to

detail

all

of

the

various

applications,

and

through

continued

usage

many

additional

applications

of

the

Resistance

Substitution

Box

will

suggest

themselves

to

the

service

man.

In

laboratory

or

circuit

development

work,

the

Resistance

SulJstitution

Box

will

prove

invalu-

able.

The

advantages

of

using

several

Resistance

SulJstitution

Boxes

are

obvious,

as

any

change

in a

circuit

constant

invariably

requires

a

corresponding

change

in

son1e

other

con1ponent.

By

having

Resistance

Substitution

Boxes

connected

in

the

plate,

gnd,

cathode

or

screen

supply

cir-

cuits,

the

entire

experimental

setup

can

be

quickly

changed.

Because

the

Heathkit

Resistance

Substitution

Box

kit

uses

standard

RTMA

values,

it

is

then

pos-

sible

to

select

from

your

workinr>:

stock

the

exact

resistor

needed

for

any

application.

The

re-

sistors

used

are

all

rated

at

1

watt

and

this

rating

should

not

be

exceeded

in

use.

The

con-

tinuous

operating

voltage

rating

of

500

volts

should

be

observed

to

prevent

a

flashover

with-

in

the

unit.

~

Page

5

SERVICE

In

event

continued

operational

difficulties

of

the

completed

instrument

are

experienced,

the

facil-

ities

of

the

Daystrom,

Limited

Service

Department

are

at

your

disposal,

or

you

may

contact

our

Technical

Consultation

Department

by

mail.

You

will

be

charged

a

minimal

service

fee,

plus

the

price

of

any

additional

material

or

parts

that

may

be

required.

THESE

SERVICE

POLICIES

APPLY

ONLY

TO

THE

COMPLETED

INSTRUMENT CONSTRUCTED IN ACCORDANCE WITH

THE

INSTRUCTIONS

AS

STATED

IN THE MANUAL.

Instruments

that

are

not

entirely

completed

or

instruments

that

are

modified

in

design

will

not

be

accepted

for

repair.

Instruments

showing

evidence

of

acid

core

solder

or

paste

fluxes

will

be

returned

NOT

repaired.

REPLACEMENTS

Material

supplied

with

Heathkits

has

been

carefully

selected

to

meet

design

requirements

and

ordinarily

will

fulfill

its

function

without

difficulty.

Occasionally

improper

instrument

operation

can

be

traced

to a

faulty

component.

Should

inspection

.reveal

the

necessity

for

replacement,

write

to

Daystrom,

Limited

and

supply

all

of the following

information:

A.

Thoroughly

identify

the

part

in

question

by

using

the

part

number

and

description

found in the

manual

parts

list.

B.

Identify

the type and

model

number

of

kit

in

which

it

is

used.

C.

Mention

date

of

purchase.

D.

Describe

the

nature

of

defect

or

reason

for

requesting

replacement.

Daystrom,

Limited

will

promptly

supply

the

necessary

replacement.

Please

do not

return

the

original

component

until

specifically

requested

to do

so.

Do

not

dismantle

the

component

in

question

as

this

will

void

the

guarantee.

This

replacement

policy

does

not

cover

the

free

re-

placement

of

parts

that

may

have

been

broken

or

damaged

through

carelessness

on

the

part

of

the

kit

builder.

SHIPPING

INSTRUCTIONS

In

the

event

that

your

instrument

must

be

returned

for

service,

these

instructions

should

be

carefully

followed.

Wrap

the

equipment

in

heavy

paper,

exerc1smg

care

to

prevent

damage.

Place

the

wrapped

equipment

in

a

stout

carton

of

such

size

that

at

least

three

inches

of

shredded

paper,

ex-

celsior,

or

other

resilient

packing

material

can

be

placed

between

all

sides

of

the

wrapped

equipment

and

the

carton.

Close

and

seal

the

carton

with

gummed

paper

tape,

or

alternately,

tie

securely

with

stout

cord.

Clearly

print

the

address

on

the

carton

as

follows:

To: DAYSTROM, LIMITED

Cooksville,

Ontario

ATTACH

A

LETTER

TO

THE

OUTSIDE

OF

THE

CARTON

BEARING

YOUR

NAME,

COMPLETE

ADDRESS,

DATE

OF

PURCHASE,

AND A

BRIEF

DESCRIP'!;ION

OF

THE

DIFFICULTY

EN-

COUNTERED.

Also,

include

your

name

and

return

address

on

the

outside

of

the

carton.

Pref-

erably

affix

one

or

more

"Fragile"

or

"Handle

With

Care"

labels

to

the

carton,

or

otherwise

so

mark

with

a

crayon

of

bright

color.

Ship

by

insured

parcel

post

or

prepaid

express;

note

that

a

carrier

cannot

be

held

responsible

for

damage

in

transit

if,

in

HIS

OPINION,

the

article

is

inadequately

packed

for

shipment.

PART

PARTS

DESCRIPTION

No.

Per

Kit

Resistors

1-1A

1 470

[l

1-2A

1

1000

[l

1-3A

1 3300

[l

1-5A

1 22

K[l

1-7A

1 47

KD

1-8A

1 68

Kn

1-9A

1 10

Kn

1-12A

1

15

[l

1-13A

1 22

[l

1-14A

1 33

[l

1-15A

1 47

[l

1-16A

1 68

[l

1-17A

1

100[2

1-18A

1

150

[l

1-19A

1 220

[l

1-20A

1

330

[l

1-21A

1 680

[l

1-22A

1

1500

[l

1-23A

1 2200

[l

1-24A

1 4700

[l

1-25A

1 6800

[l

1-26A

1 15

K[l

1-27A

1 33

Kn

1-28A

1

100

Kn

1-29A

1

150

K[l

l-30A

1 220

Kn

1-31A

1

330

K[l

1-32A

1

470

KD

l-33A

1 680

K[l

1-34A

1 1

megohm

1-35A

1

1.5

megohm

l-36A

1

2.2

megohm

1-37A

1

3.3

megohm

1-38A

1

4.7

megohm

1-39A

1

6.8

megohm

1-40A

1 10

megohm

PARTS

LIST

MODEL

IN-12

PART

PARTS

DESCRIPTION

No.

Per

Kit

Hardware

-250-27

4

6-32

x 2"

screw

-

0

250-9

2

6-32

x

3/8"

screw

-

252-3

2

6-32

nut

-

252-7

2

Control

nut

-

253-1

2 #6

flat

fiber

washer

Page

7

-

253-2

2 #6

fiber

shoulder

washer

253-10

2

254-4

2

259-1

2

Miscellaneous

344-1

1

408-M3

1

-

427-2

2

-

462-139

2

-·

463-27

2

-

60-4

1

-

63-38

2

100-M16B

2

213-M1

1

Control

flat

washer

Control

lockwasher

#6

solder

lug

Length

hookup

wire

Case

Binding

post

base

Knob

Knob

pointer

SPDT

slide

switch

Rotary

switch

Binding

post

cap

Figure

8

resistor

mounting

unit

203-M28F782,

783 784

331-6

595-571

1

Panel

Solder

Manual

RESISTOR

COLOR

CODES

The

colored

bands

around

the

body of a

color

coded

rebL:IhH·

rPp-

resent

its

value

in

ohms.

These

colored

bands

are

grouped

toward

one end of

the

resistor

body.

Starting

with

this

end

of

the

resistor,

the

first

band

represents

the

first

digit

of

the

resistance

value; the

second

band

represents

the

second

digit;

the

third

band

represents

the

number

by which

the

first

two

digits

are

multiplied.

A

fourth

band

of gold

or

silver

rep-

resents

a

tolerance

of

±5%

or

±10%

respectively.

The

absence

of a

fourth

band

indicates

a

tolerance

of ±20%.

CODE

COLOR

1sT

DIGIT

2ND

DIGIT

MULTIPLIER

BLACK--+--

BROWN--+--

RED

-

CRANCE

YELLOW

~;§g~

CRAY

WHITE

COLD

SILVER

I

---10

---

100

---

1,000

·-+---

1qooo

-

100,000

~ooo.ooo

10.000.000

100,000.000

LOOO,OOO,OOO

.I

.01

The

ph) s1eal

size

of a

composition

resistor

is

related

to

Ita

wattage

ratiJ1g.

Size

increases

progressively

as

the

wattage

rating

is

L'lcreased.

The

diameters

of

1/2

watt,

1

watt

and

2

walt

resistors

are

approximately

1/8",

1/4"

and

5/16",

respectivtl:;.

The

color

code

chart

and

examples

which follow

provide

the

info: m:!"iun

req_u!rfd

to

identify

color

coded

resistors.

EXAMPLES

r--YELLOW-4

}

47

X lOOO

I

.

,--VIOLET-7--

(oR

47Kn)

I

,--ORANGE-~000-

~j

j~SILVER"'

TOLERANCE

Bl

± IO"'lo

~--RED

-2

122

X

100,000

i

~--

~~~ElN-100,000

5(oR

2.2

MEG.)

~~~NO

BAND

•

TOLERANCE

f

""'f=

±

20

"'lo

USING

A

PLASTIC

NUT

STARTER

A

plastic

nut

starter

offers

a

convenient

method

of

starting

the

most

used

sizes:

3/16"

and

1/4"

(3-48 and 6-32). When

the

correct

end

is

pushed

down

over

a nut,

the

pliable

tool

conforms

to

the

shape

of

the

nut

and

the

nut

is

gently

held

while

it

is

being

picked

up and

started

on

the

screw.

The

tool

should

only be

used

to

stact

the

nut.

6-32

@

®-

-®

3-48

@

Page

6

_t1!

,;

a§

11

1

1 1

1!

"''

.'iiii£j

+ +

oli

sli

+c1li + + + + +

••

oOc

dli

+

+ffi

,, +

nF

'"'

c1m

f + +

•jO[

+

"'"

¢.11

'

l I

WARRANTY

Daystrom,

Limited

warrants

that

for

a

period

of

three

months

from

the

date

of

shipment,

all

Heathkit

parts

shall

be

free

of

defects

in

materials

and

workmanship

under

normal

use

and

service

and

that

in

fulfillment

of

any

breach

of

such

warranty,

Daystrom,

Limited

shall

replace

such

defective

parts

upon

the

return

of

the

same

to

its

factory.

The

foregoing

warranty

shall

apply

only

to

the

original

buyer,

and

is

and

shall

be

in

lieu

of

all

other

warranties,

whether

express

or

implied

and

of

all

other

obligations

or

liabilities

on

the

part

of

Daystrom,

Limited

and

in

no

event

shall

Daystrom,

Limited

be

liable

for

any

anticipated

profits,

consequential

damages,

loss

of

time

or

other

losses

incurred

by

the

buyer

in

connection

with

the

purchase,

assembly

or

operation

of

Heathkits

or

components

thereof.

No

replacement

shall

be

made

of

parts

damaged

by

the

buyer

in

the

course

of

handling

or

assembling

Heathkit

equipment.

NOTE:

The

foregoing

warranty

is

completely

void

and

we

will

not

replace,

repair

or

service

instruments

or

parts

thereof

in

which

acid

core

solder

or

paste

fluxes

have

been

used,

E3STROM,

LIMITED

SPECIFICATION

CHANGES

All

prices

are

subject

to

change

without

notice.

Daystrom,

Limited

reserves

the

right

to

dis-

continue

instruments

and

to

change

specifications

at

any

time

without

incurring

any

obligation

to

incorporate

new

features

in

instruments

previously

sold.

I

~

'[

[]pA;ySTROM,

LIMITED

..

THE

WORLD'S

FINEST

ELECTRONIC

EQUIPMENT

IN

KIT

FORM

LITHO

IN

CANADA

595-571 !