Micromint MICROVOX User manual

~s

MICROVOX

TEXT

TO

SPEECH

SYNTHESIZER

ASSEMBLY

INSTRUCTIONS

THE

MICROMINT

INC.

561

Willow

Avenue,

Cedarhurst,

N.Y.

11516

TABLE

OF

CONTENTS

Page

Assembling

the

Microvox

Text-to-Speech

Synthesizer

Parts

List

5-6

Schematics

7-8

Power

Supply

Schematic

9

Warranty

10

Assembling

the

MicroVox

Text

to

Speech

Synthesizer

The

MICROMINT

has

made

every

effort

to

produce

a

quality

kit.

It

must

be

realized

however,

that

the

difference

between

the

price

of

an

assembled

and

tested

unit

and

a

kit

of

components

is

substantial.

The

difference

accounts

for

the

equipment

and

labor

involved

with

assembly,

testing

and

burnin.

This

is

not

a

novice

project

and

the

directions

assume

that

you

have

some

experience

building

electronic

projects

and

have

test

equipment

available

to

you

to

trouble

shoot

problems

if

any

arise.

The

MICROMINT

uses

only

prime

components

and

devices

such

as

the

SC-01A

and

the

EPROMS

are

tested

before

shipment.

NOTE:

This

kit

contains

approximately

100

components.

While

all

components

could

be

randomly

inserted

and

soldered,

the

preferred

procedure

is

to

insert

and

solder

the

components

in

stages.

'ISTEP

1

-

Insert

and

solder

all

resistors

except

Rll

and

SIP1.

The

best

procedure

is

to

find

the

location

of

each

resistor

on

the

board

and

then

insert

the

correct

component

value

as

listed

in

the

Parts

List.

The

color

code

of

each

resistor

is

also

provided

as

an

aid.

Be

careful

that

two

resistors,

R19

and

R20,

are

larger

1/2

W

resistors

while

the

others

are

1/4

W.

^TEP

2

-

Insert

and

solder

the

19

IC

sockets.

Note

that

1

on

each

socket

is

designated

on

the

board

by

a

dot

that

pin.

The

notch

on

the

end

of

the

socket

should

also

line

up

with

the

layout

shown

on

the

silkscreen.

Since

the

socket

covers

the

IC

number

on

the

silkscreen,

refer

to

the

attached

component

diagram

for

proper

orientation.

DO

NOT

INSTALL

ANY

ICs

AT

THIS

TIME

(None

of

the

IC's

should

be

removed

from

the

shipping

foam

unless

they

are

to

be

immediately

installed

in

the

board).

\A

STEP

3

-

Insert

and

solder

all

capacitors.

The

electrolytic

capacitors

are

tubular.

They

have

the

negative

side

of

the

capacitor

designated

usually

with

a

minus

sign

and

arrows

pointing

in

that

direction.

The

opposite

side

is

positive.

When

inserting

these

components

into

the

board

the

positive

lead

of

the

capacitor

should

be

inserted

into

the

pad

with

the

"+"

mark.

Note,

unlike

the

ICs,

the

"+"

sides

of

the

capacitors

aren't

all

in

the

same

direction.

The

ceramic

capacitors

are

generally

circular.

Note

that

Cl

is

0.01

Mfd.

Do

not

mix

it

with

the

others

or

the

board

will

not

function

properly.

Cll

is

a

circular

trim

capacitor.

STEP

4

-

Install

crystal

XI.

It

should

be

soldered

such

that

it

stands

upright

about

1/8"

above

the

board.

Don't

bend

the

leads

too

much.

They

break

easily.

Page

1

STEP

5

-

Insert

and

solder

SIP1,

Dl,

D2,

Zl,

and

Z2.

SIP1

is

a

10

lead

resistor

pack

which

has

a

dot

on

one

end

to

indicate

the

common.

When

inserted,

this

dot

should

line

up

with

the

dot

etched

on

the

PC

board

and

be

toward

IC14.

D2

is

a

full

wave

bridge

rectifier

with

"+"

and

indicated

on

the

side.

When

inserted,

these

leads

should

go

in

the

holes

silkscreened

with

those

polarities.

Dl,

Zl,

and

Z2

have

a

colored

band

on

one

edge

to

indicate

the

cathode

lead

or

"bar"

side

of

the

device.

When

inserting

these

components,

orient

the

bar

to

line

up

with

that

pictured

on

the

silkscreen.

STEP

6

Insert

and

solder

the

two

8

position

DIP

switches

SW1

and

SW2.

(In

the

case

of

SW2,

a

2

by

9

BERG

header

may

be

supplied

instead.

It

is

inserted

in

the

two

rows

of

holes

on

the

left

side

of

the

retangular

pattern

drawn

in

the

silkscreen

under

the

words

"DATA

RATE".

A

separate

jumper

bar

is

used

to

actuate

the

1

of

9

position

switch

action).

Both

DIP

switches

should

be

inserted

with

the

position

1

switch

oriented

in

the

same

direction

as

1

on

the

IC

sockets

(ie.,

if

the

rs-232

and

parallel

conectors

are

thought

of

as

the

top

of

the

board,

then

switch

1

is

toward

the

top

of

the

board.

STEP

7

-

Insert

and

solder

connectors

Jl

(DB-25S,

RS-232)

and

J2

(ear

phone/

ext

speaker

jack)

and

the

2

by

3

header

between

Jl

and

IC3.

STEP

8

Insert

the

6-32

3/8"

screw

through

the

mounting

hole

on

VI

from

the

bottom

of

the

board

and

hold

it

with

your

finger.

Next,

lay

the

6072

heatsink

between

C18

and

C19

over

the

screw

then,

the

7805

(VI)

regulator

with

its

label

side

up.

The

three

leads

of

VI

should

be

bent

at

right

angles

and

push

through

the

holes

labeled

1,

2,

and

3.

Finally,

lay

the

6071

heatsink

over

the

same

screw

so

that

it

surrounds

VI.

Add

the

6-32

nut,

tighten

and

solder

VI.

STEP

9

-

Wire

and

insert

potentiometer

Rll.

Attach

three

wires,

approximately

3."

in

length,

to

the

three

adjacent

leads

of

Rll.

Attach

two

(or

a

twisted

pair)

8"

leads

to

the

switch

connections

on

the

bottom

of

the

pot.

The

three

volume

control

leads

are

inserted

in

the

holes

under

the

word

"VOLUME"

on

the

silkscreen.

Temporarily

invert

the

pot

while

you

do

this

so

that

the

three

leads

line

up

with

the

three

holes

(it's

necessary

to

turn

the

pot

180

degrees

to

make

it

fit

with

the

face

plate).

The

8"

leads

are

soldered

into

two

holes

labeled

POWER

SWITCH"

VI.

Rotate

the

shaft

of

Rll

fully

counter

clockwise

so

that

it

is

in

the

off

position.

Page

2

STEP

10

-

Attach

the

LED

and

transformer.

The

LED

inserts

in

the

two

holes

the

heatsink

for

VI.

For

the

time

being,

insert

the

LED

such

that

it

sticks

above

the

board

at

its

maximum

height

(about

1

1/2").

Carefully

apply

the

MicroVox

front

decal

to

the

face

plate

(Note:

Some

face

plates

may

be

silk

screened

instead

of

having

a

separate

decal).

Install

the

face

plate

and

bend

the

LED

at

a

right

angle

so

that

it

protrudes

through

the

hole

provided

for

it

(make

sure

that

the

two

leads

don't

touch

each

other

or

the

heatsink).

The

pot

(Rll)

can

also

be

inserted

and

bolted

on

at

this

time

to

keep

it

from

flopping

around.

Place

the

serrated

washer

on

the

inside

to

keep

from

tearing

the

decal.

The

back

plate

and

knob

can

be

installed

at

any

time.

The

transformer

has

three

leads

which

are

inserted

on

the

left

side

of

the

board

under

22VCT.

Two

of

the

leads

are

labeled

AC

and

one

is

CT.

The

AC

leads

are

generally

black

and

white

or

black

and

green.

The

CT

lead

is

generally

red.

If

you

have

any

doubts,

you

can

verify

the

proper

leads

with

an

AC

voltmeter.

With

the

transformer

plugged

in,

you

should

look

for

two

leads

which

each

read

about

11

VAC

referenced

to

the

third

lead

(improper

connection

will

read

22

VAC).

The

two

leads

which

indicate

11

volts

are

the

AC

connections

and

the

reference

lead

is

CT

(center

tap).

Slip

the

grommet

over

the

transformer

cable

and

make

these

conections

to

the

board

with

the

transformer

unplugged.

STEP

11

-

Without

any

ICs

installed,

power

up

the

board

by

plugging

in

the

transformer

and

rotating

the

pot

switch

(Rll)

clockwise.

The

LED

should

light

(this

is

generally

an

adequate

test

but

you

may

want

to

reassure

yourself

a

little

by

measuring

a

few

voltages

before

plugging

in

$120

worth

of

chips).

Using

a

DC

voltmeter,

attach

one

lead

to

the

negative

side

of

C18

(circuit

ground).

With

the

other

lead

you

should

observe

the

following:

+5

volts

at

IC18

14:

+12

volts

at

IC

17

14;

and,

-12

volts

at

IC17

1.

If

you

do

not

observe

these

readings

look

for

a

solder

short,

or

recheck

the

transformer

connections

and

the

polarities

of

Zl,

Z2,

Dl,

and

D2.

Step

12

-

If

no

shorts

exist

and

everything

else

checks

out

OK,

turn

off

the

power,

unplug

the

transformer

and

insert

all

the

ICs

except

the

SC-01A

(IC12).

(Take

special

care

when

inserting

them.

Some

are

static

sensitive.)

The

indentation

or

notch

on

the

case

of

the

IC

indicates

1

and

should

line

up

with

silk

screened

layout

on

the

board.

There

are

two

2732

EPROMS

(one

should

be

labeled

E00Q

or

HIGH

and

the

other

C000

or

LOW)

and

one

2016

RAM

among

the

ICs.

The

2016

should

be

inserted

in

location

IC2.

IC3

is

for

an

optional

2016

input

buffer

expander

(requires

different

EPROM

chips

than

those

supplied)

and

should

be

left

empty.

The

two

EPROMS

should

be

installed

in

IC4

(HIGH)

and

IC5

(LOW).

These

sockets

are

28

pins

and

the

EPROMS

are

24

pins.

The

EPROMS

should

be

inserted

in

the

lower

24

pins

of

the

28

socket

(pins

1,

2,

27,

and

28

should

be

empty).

Page

3

STEP

13

-

Jumper

installation.

While

there

are

various

jumper

options

on

the

MicroVox

board,

many

such

as

memory

type

and

clock

rate

are

already

set

for

this

application

with

a

PC

trace.

SWl,

SW2

and

the

2

by

3

header

should

be

set

to

specific

default

conditions

for

testing.

These

settings

are

described

in

detail

in

the

MicroVox

User's

Manual.

For

testing

purposes

however,

just

set

the

following:

SWl

positions

1-6

open,

position

7

and

8

closed;

SW2

position

2

closed

all

the

rest

open;

and,

2

jumpers

should

be

placed

in

the

DCE

positions

of

the

2

by

3

communication

line

switching

header

behind

Jl.(lf

you

are

using

a

CRT

terminal

to

check

your

MicroVox,

you

can

get

a

full

duplex

character

echo

from

the

MicroVox

by

placing

the

two

jumpers

on

the

same

side

of

the

header

(ie.,

one

DTE

and

one

DCE).

STEP

14

-

Testing

and

Checkout.

Attach

an

8

Ohm

speaker

to

a

mini-plug

(not

supplied)

and

plug

it

into

J2.

If

you

have

no

plug,

you

can

attach

the

speaker

to

the

two

pads

to

the

left

of

J2

labeled

"INT

SPKR".

When

an

external

speaker

is

plugged

into

J2

it

will

shut

off

this

internal

speaker.

With

the

pot

switched

off,

plug

in

the

MicroVox.

Turn

on

the

pot

switch

and

the

volume.

Since

no

SC-01A

is

in

the

circuit,

nothing

should

be

heard.

You

might

check

voltages

again

just

to

make

sure

there

are

no

power

problems.

If

everything

is

OK,

unplug

the

transformer

(don't

just

shut

off

the

pot

switch)

and

carefully

insert

the

SC-01A

(IC12).

Testing

the

proper

operation

of

the

MicroVox

board

is

simply

a

go/no-go

test

and

consists

of

plugging

it

in.

With

the

pot

switched

off,

plug

in

the

MicroVox.

Turn

on

the

pot

switch

and

the

volume.

The

MicroVox

should

say

"READY".

If

it

says

ready,

proceed

to

the

User's

Manual

and

exercise

the

different

control

modes.

If

it

doesn't

say

"READY",

turn

off

the

power

immediately

and

check

for

proper

insertion

of

the

ICs

again.

Unfortunately,

aside

from

exchanging

and

testing

each

of

the

individual

ICs,

there

are

no

diagnostic

tests

that

can

be

performed.

"READY"

being

voiced

is

a

test

of

the

speech

section

and

exercises

all

portions

of

the

circuit

except

the

serial

and

parallel

input

ports.

The

software

cannot

work

without

an

operational

SC-01A

installed

(even

those

functions

not

dealing

with

speech).

Help

From

the

Factory

Given

the

fact

that

the

kit

MicroVox

is

user

assembled,

the

MICROMINT

cannot

extend

the

same

warranty

as

factory

assembled

and

tested

units.

The

MICROMINT

makes

no

guarantee

on

user

assembled

systems

except

that

the

components

are

functional.

The

MICROMINT

will

replace

any

defective

components

which

are

not

defective

as

the

result

of

user

neglect.

If

you

are

unable

to

get

your

MicroVox

to

operate,

the

MICROMINT

offers

a

factory

inspection

and

repair

service.

The

charge

is

$35

per

hour

(minimum

one

hour

prepaid

in

advance)

plus

parts.

Before

anything

is

returned

for

repair

an

authorization

sticker

must

be

obtained

from

MICROMINT.

This

can

be

obtained

by

calling

the

business

office

at

(516)

374-6793.

If

the

repair

exceeds

$35

you

will

be

notified

before

the

repair

is

done.

Page

4

MICROVOX

PARTS

LIST

^C1

^C2

^C3

C4

C5

C6

~^C7

^C8

C9

Xcio

^

Cll

X

'C12

^C13

^C14

^C15

^C16

v

^C17

C18

C19

^C20

C21

^C22

^1

^S2

^

I

nS

i

"s*

N*

0.01

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

100

Mfd

25V

Electrolytic

0.1

Mfd

16V

Ceramic

Disc

220

Mfd

25V

Electrolytic

0.1

Mfd

16V

Ceramic

Disc

10

Mfd

25V

Electrolytic

n/a

220

Mfd

25V

Electrolytic

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

0.1

Mfd

16V

Ceramic

Disc

2200

Mfd

25V

Electrolytic

470

Mfd

25V

Electrolytic

10

Mfd

25V

Electrolytic

10

Mfd

25V

Electrolytic

10

Mfd

25V

Electrolytic

1N4148

KBP02

Bridge

or

equivalent

1N4742A

6502

Microprocessor

2016

IK

X

8

RAM

2016

IK

X

8

RAM

(optional)

2732

EPROM

(programmed)

2732

EPROM

(programmed)

CD4040

74LS04

74LS00

74LS139

6850

UART

INS8255

PIO

SC-01A

Phoneme

Synthesizer

74LS175

74LS74

LM386

AMP

7407

MC1488

MC1489

7497

TIL

220,

RED

2.2K

(RED

RED

RED)

4.7K

(YEL

VIO

RED)

4.7K

2,2K

2.2K

470K

(YEL

VIO

YEL)

Page

5

R9

l/

RIO

1

/

Rll

Rl2i^

R13^

R14i^

R15^

R16</

R17^

R18

R19

^

R20

^

R21

51

52

SIP1

VI

XI

Micromint

Heat

Sink

Heat

Sink

3.3K

(ORG

ORG

RED)

10K

(BRN

BLK

ORG)

10K

POT

W/SWITCH

10

OHM

(BRN

BLK

BLK)

4.7K

33K

1.8K

33

OHM

10

OHM

(ORG

ORG

ORG)

(BRN

GRY

RED)

(ORG

ORG

BLK)

(BRN

BLK

BLK)

33

OHM

1/2

W

100

OHM

1/2

W

(BRN

BLK

BRN)

470

OHM

(GRN

VIO

BRN)

8

POS

DIP

SW

8

POS

DIP

SW

(or

2

X

9

Berg

header)

4.7K,

10

Resistor

SIP

MC7805

Regulator

Crystal

4.9152

Mhz

Text

to

Speech

PC

Board

THM6071B

THM6072B

Screw,

6/32

x

3/8

Nut,

6/32

Transformer

PITB-109

22VCT

@300

MA

Jack,

Keystone

901,

Submini

phono

Connector,

DB-25,

RS-232C

Berg

Strip

9x2

(see

SW2

above)

Berg

Strip

3x2

Berg

Jumper

(qty

2)

Case

top

Case

bottom

Case

screws

(2)

Standoff,

(qty

4)

Screw,

#4

x

3/4,

self-tapping

(qty

4)

Knob,

volume

control

Label

(FCC/ID)

Face

decal

(MicroVox)

Misc

wire

Front

Plate

Back

Plate

Grommet

Sockets

8

solder

(1)

14

solder

(6)

16

solder

(4)

22

solder

(1)

24

solder

(3)

28

solder

(2)

40

solder

(2)

Page

6

Micromint MICROVOX User manual

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