Simmons Sd81 User manual

8P8/=5Cotuert

torn

Proof

of

equation

Introducing

the

SDS

1,

the

new

battery

powered

digital

drum

from

Simmons.

Its

sounds

are

digitally

recorded

and

easily

interchangeable,

either

from

the

library

of

sounds

available

at

your

Simmons

dealer

or,

more

excitingly,

from

your

own

personally

sampled

collection,

care

of

the

revolutionary

sampling

and

EPROM

blowing

device,

the

SDS

EPB.

The

SDS

1

is

a

full

sized,

hexagonal

Simmons

pad,

complete

with

new

rubber

playing

surface,

and

facilitates

perfect

dynamic

control

over

volume,

pitch

bend

(up

or

down),

attack

and

brightness.

Connections

are

provided

for

battery

eliminator

and

external

trigger,

accepting

signals

from

drum

machines,

miked

acoustic

drums,

drum

tracks

off

tape,

sequencers

etc.

A

clever

little

instrument

—

but

eight

concert

toms?

The

SDS

1

features

a

unique

"run

generator"

which,

when

implemented,

instructs

the

instrument

to

output

the

selected

sound

at

a

lower

pitch

for

each

consecutive

strike

of

the

drum.

The

period

of

time

over

which

this

effect

is

active

can

be

controlled.

Therefore,

if

the

SDS

1

is

struck

eight

times

with

the

run

time

set

at

four

seconds

and

a

concert

torn

sound

sample

installed,

the

SDS

1

=

8

concert

toms.

Well

done

Simmons,

stay

at

the

top

of

th

class.

GrOUp

Centre

IllC*

23917

Craftsman

Road,

Calabasas,

Ca.

91302

Telephone

818-884-2653

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[SIMMONS)

c

SDS1

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O

SDS1

OPERATING

INSTRUCTIONS

The

SDS1

is

a

single

battery

operated

digital

drum

incorporating

many

of

the

features

found

on

the SDS3,

7,

and

8

professional

electronic

drum

kits.

It

can

be

used

singularly,

to

augment

existing

electronic

and

acoustic

drum

kits,

or

as the

basis

for

a

'multiple

SDSl'

digital

drum

kit.

The

sound

produced

by

the

SDS1.

is

a

digital

recording

of

a

real

drum

stored

in

a

PROM.

(Programmable

Read

Only

Memory).

The

PROM

is

plugged

into

the

front

of

the

drum

and

can

be

changed

easily,

enabling

the

sound

of

the

drum

to be

changed

totally.

A

library

of

sounds

are

available

from

your

Simmons

dealer

including

all

popular

drum

and

electronic

drum

sounds,

or

you

can

program

your

own

sounds

for

use

with

the

SDS1

with

the

Simmons

Sampler

and

E-PROM

blower

(SDS

EPB).

The

SDS1

is

dynamic,

the

harder

you hit the

drum

the

louder

and

brighter

the

sound

is.

OPERATION

Mount

the

drum

on the

arm

provided

and

clamp

the Ax2

adapter

to

a

convenient

stand

(full

stands

are

available

from

your

Simmons

dealer).

If

you

require

to

mount

the

SDS1

as

a

right

hand

drum

(i.e.

The

control

panel

is

at

the top

of

the

drum)

fit

the

'reverse

legend1

over

the

front

panel

by

removing

the

six

control

knobs

(they

just pull

off).

Fit

A

x

PP16

1.5v

cells

in

the

battery

holder

at

the

side

of

the

drum.

Make

sure

you

insert

the

batteries

the

correct

way.

-

reversing

the

batteries

may

damage

the

SDSl.

Insert

the

batteries

into

the

holder

negative

(-)

ends

first,

so

that

the

+

end

of

the

last

battery

is

sticking

out.

Alternatively,

power

the

SDSl from

an

external

battery

eliminator

(v

voLts

DC)

such

as

the

type

used

to

power

calculators

etc,

via

the

DC

IN

3.5mm

Jack

socket

on

the

front

panel.

c

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e

AMPLIFICATION

Connect

the

SDS1

to

a

suitable

amplifier

via

a

standard

amplifier

1/4

inch

Jack

-

Jack

lead,

the

output

from

the

drum

is

on

the

clamp

side

of

the

drum

along

with

the

battery

holder.

The

SDS1

produces

a

punchy

sound

with

a

fast

initial attack,

you

will

need

a

good

amplification

system

to

achieve

the

best

results

from

the

SDSl.

A

full

bandwidth

P.A.

type

amplifier

with

a

bin/horn

speaker

combination

would

be

fine.

Alternatively,

in

many

cases,

the

group's

P.A.

system

can

be

utilised.

PROMS

The

SDSl

comes

supplied

with

a

PROM

which

contains

the

desired

drum

sounds

(i.e.

Snare

-

Tom

Tom).

This

should

be

inserted

with

the

notch

away

from

the

playing

surface,

i.e.

to

match

the

front

panel

legend

•^TCAUTION

-

PROMS

are

delicate

silicon

chips

and

will

not

stand

abuse.

The

easy

access

to

the

PROM

used

in

the

SDSl

gives

you

maximum

flexibility

but

also

the

opportunity

to

destroy

the

PROMS

as

well

as

the

SDSl

internal

circuitry.

The

following

precautions

should

be

taken:-

1.

Do

not

expose

the

PROM

to

ultra

violet

light,

direct

sunlight,

or

any

source

of

high

intensity

light

or

heat

-

this

will

erase

the

data

(the

sound

of

the

drum)

stored

in

the

PROM.

2.

Do

not

remove

the

voice

identifier

sticker

on

the

PROM

-

this

gives

some

protection

against

accidental

erasure.

3.

Do

not

plug

the

PROM

into

the

socket

upside

down

-

this

can

cause

untold

harm

to

PROM

and

SDSl

-

if

in

doubt

consult

your

dealer.

4.

If

you

are

building

a

library

of

sounds,

use

PROMS

supplied

by

Simmons

and

store

them

In

the

black

conductive

foam

supplied

and

store

them

out

of

direct

light

in

a

safe

place.

5.

Avoid

handling

the

PROMS

in

areas

where

high

static

charges

are

likely

to

build

up

-

i.e.

nylon

carpets

and

Van

der

Graff

generators.

6.

Please

do

not

hit the

PROM

with

a

drum

stick.

The

SDSl

can

play

two

types

of

PROM;

8k

(8000

bytes)

labelled

2764 and

16k

(16000

bytes)

labelled

27128.

The 27128

can

store

a

sound

twice

as

long

as

the

2764

(and

is

also

twice

the

cost).

Generally

the

64

is

used

for

short

sounds

i.e.

cow

bells,

snares,

bass

drums,

the 128

for

Tom

Toms,

cymbals

etc.

-

See

more

on

PROMS

for

further

discussion

on

sampling

and

E-PRQMS.

Scan by Manual Manor

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r

o

Enough

of

the

don!ts.

Here's

where

you

get

to

hit

the

drum

FUNCTIONS

1.

SENSITIVITY

AND

VOLUME

Turn

the run

time,

Bend,

pitch,

sens,

and

volume

haf

way.

Turn

the

run

amount

fully

anticlockwise.

Hit

the

SDS1 and

adjust

the

output

volume/amplifier

volume

for

the

desired

level.

Adjust

the

sens

(sensitivity)

to

suit

your

style

of

playing.

At

minimum

sensitivity,

the

drum

will

not

trigger

the

sound

at

all,

as

you

turn

the

sensitivity

clockwise

the

drum

becomes

progressively

more

sensitive

until

all

dynamic

control

is

lost

at

its

fully

clockwise

position.

(Only

the

softest

taps

on

the

drum

will

sound

quieter).

2.

PROM

TYPE

If

the

prom

is

a

27128,

switch

the

PROM

type

switch

to

128.

(If

the

switch

is

in

the

f64f

position

only

the

first

half

of

the

sound

will

be

played).

If

the

PROM

is

a

2764,

switch

the

PROM

type

switch

to

64.

(If

the

switch

is

in

the

f12&!

position

the

sound

will

be

played

twice

- ie.

repeated).

You can use the

switch

in

any

position

if

you

require

the

'shortening1

or

Techor

effect.

3.

PITCH

The

PITCH

control

adjust

the

pitch

of

the

drum.

Clockwise

-

the

pitch

of

the

drum

is

high,

anticlockwise

-

low.

As

the

pitch

of

the

drum

is

increased,

the

sound

gets

shorter.

As

the

pitch

is

lowered,

the

sound

lengthens.

At

its

lov/est

pitches

the

digital

sound

becomes

distorted

and

'grainy1

-

this

is

normal

and

unavoidable

-

See

further

discussion

on

SAMPLING

+

E-PROMS.

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r

BEND

The

pitch

of

the

drum

can

be

altered

by

the

BEND

control.

At

its

half-way

position,

it

has

no

effect.

Turning

the

control

clockwise

from

"the

central

point

adds

an

increasing

amount

of

bend

down:

i.e.

as

the

drum

is

struck,

it

starts

.at

a

higher

pitch

and

the

pitch

fails

as

the

sound

dies

away,

Turning

the

control

anticlockwise

from

the

central

point

has

the

reverse

effect:

i.e.

as

the

drum

is

struck,

the

pitch

is

lower

but

rises

as

the

sound

dies

away.

The

amount

of

bend

is

also

affected

by

how

hard

the

drum

is

struck

-

the

harder

the

hit,

the

more

the

pitch

of

the

drum

is

bent.

RUN

The

RUN

generator

in

the

SDS

1

is

used

to

mimic

a

torn torn

fill

around

a

multi

torn

drum

kit.

Turn

the

bend

off

(half

way)

so

as

to

hear

the

effect

of

the

run

generator,

set

the

run

time

and

run

amount

half

way.

Hit

the

drum

six

or

seven

times

in

rapid

succession

-

each

hit

produces

a

note

lower

than

the

When

the

run

is

in

progress,

the run

LED

will

glow,

the

run

period

is

indicated

by

how

long

the

LED

is

lit.

The

speed

at

which

the

pitch

of

the

drum

descends

is

controlled

by

the run

time

(at

minimum

a

fraction

of

a

second

-

at

maximum

four

seconds)

and

the

interval

between

the

highest

and

lowest

note

in

the

run

is

controlled

by

the

run

amount

control.

If

a

short

run

time

is

.selected

and

a

fast

pattern

played

on

the

drum,

a

'sample

and

hold'

effect

can

be

achieved

-

the

run

generator

producing

a

randomly

pitched

sound

at

each

successive

hit.

c

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SEQUENCER

INPUT

A

sequencer

or

any

gate

signal

can

be

used

to

trigger

the

SDS1

by

feeding

the

trigger

signal

into

the

trig

jack

on

the

front

panel

of

the

SDSl

(3.5mm

Jack).

.

The

SDSl

will

trigger

on

the

positive

edge

of

the

gate

signal

and

will

•react

dynamically

to

the

amplitude

of

the

incoming

signal.

Other

signals

such

as

click

tracks

and

sharp

acoustic

noises

can

be

used

to

trigger

the

SDSl.

(Via

microphone

etc).

A

particularly

interesting

percussive

effect

can

be

obtained

by

using

an

existing

drum

pattern

on

tape,

using

this

signal

to

trigger

the

SDSl

and

utilising

the

run

facility

to

produce

a

new

drum

track

(or

noise

track

depending

upon

the

digital

sample

stored

in

the

PROM)

of

random

pitches.

EXTERNAL

POWER

SUPPLY

By

plugging

an

external

power

source

into

the

DC

input

socket

on

the

front

of

the

SDSl,

the

SDSl

can

run

without

batteries.

A

DC

supply

of

€

volts

at

50 ma is

required

with

the

+ve

wired

to

the

tip

of

the

3.5mm

Jack.

USE

WITH

THE

SDS

EPB

The

SDSl

can

be

used

to

produce

any

acoustic

sounds,

from

bells,

breaking

glass,

to

jingles,

guitar

chords

and

dogs

barking

-

if

that

sound

has

been

stored

in

a

PROM

and plugged

into

the

SDSl.

The

Simmons

Digital

Sampler

and

E-PROM

Blower

(SDS

EPB)

will

allow

you

to

sample

the

sound

of

your

choice,

program

an

E-PROM

with

that

sound

and

then

use

the

E-PROM

as

the

sound

source

for

the

SDSl

-

using

the

controls

on

the

SDSl

to

manipulate

the

sound.

EG.

Record

a

single

guitar

chord,

plug

the

PROM

into

the

SDSl

and use

the

run

generator

to

produce

randomly

pitched

percussive

guitar

chords

as

the

drum

is

struck.

;

So,

for

yoir

Information,

here

is

a

printed

extract

from

the

EPB

Manual

to

tell

you

about

sampling,

E-PROMS

and

the

like:-

L

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r

FURTHER

DISCUSSION

ON

SAMPLING

AND

E-PROMS

The

SDS

EPB

is

a

digital

sampler/Eprom

blower

capable

of

recording

sounds

digitally

and

storing

them

in

an

Eprom

for

use

in

the

SDS7

and

SDSl.

Depending

on

the

capacity

of

the

Eprom

selected,

the

EPB

can

record

sounds

of

between

0.4

and

3

seconds

duration

making

it

ideal

for

percussion

synthesis.

The

EPB

is

an

invaluable

tool

to

the

SDS7

or

SDSl

owner,

further

increasing

the

scope

of

what

is

already

the

world's

most

versatile

drum

system.

WHAT

IS

AN

E-PROM

E-Prom

stands

for

erasable

programmable

read

only

memory.

The

memory

itself

consists

of

'cells'

of

information.

Each

'cell'

can

be

either

1

or

a

logic

zero

(i.e.

on

or

off).

^&*

These

'cells'

are

referred

to

as

a

'Bit1.

These

bits

of

information

are stored

together

in

groups

of

eight.

Each

8

bits

being

a

'byte'

or

'word'

This

byte

can

represent

any

number

in

the

range

zero

(all

bits

=

0)

to

255

(all

bits

=1)

and

these

numbers

can

in

turn

represent

a

musical

tone

or

wave

form

(see

sampling).

The

number

of

bytes

of

information

that

a

prom

can

contain

depends

upon

the

size

of

the

silicon

chip

inside,

coupled

with

how

small

each

cell

can

be

manufactured.

Up

until

a

year

or so

ago

the

largest prom

available

(affordable)

could

store

only

2000

bytes

but

with ever

advancing

technology

proms

are

now

readily

available

which

can

store

4000,

8000,

16,000

and

32000

bytes

of

information.

*

These

chips

are

marked

with

a

number

that

corresponds

to

the

number

of

'bits'

that

it

contains.

(Remember

1

byte

=

8

bits),

so:-

2K

(K-1000)

E-Prom

is

marked

(27)

16

(

16

=

2x8)

4K

" "

(27)

32

(

32

=

2x8)

8K

" "

(27)

64

(

64

=

8

x

8)

16K

"

(27)

128

(

128

=

16

x

8)

(

32K

"

(27)

256

(

256

= 32

x

8)

(Cont....

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r

C

WHAT

IS

AN

E-PROM?

(

Cont)

The

number

27

is

a

type

code,

and

this

along

with

date

codes,

manufacturers

trade

marks,

numbers

and

access

speeds

can

be

marked

on

the

chip.

Read

only

memory

means

that

the

prom

can

only

output

data

(Bytes).

Once

the

prom

is

installed

in

a

system,

data

can

only

read

from

it.

Data

can

never

be

stored

in

it,

other

than

the

original

programmed-data.

The

SDS

EPB

will

enable

you

to

enter

data

into

the

prom

initially

(this

data

will

represent

an

acoustic

sound)

-

this

is

called

blowing

the

prom.

E-Proms

however,

have

a

window

in

the top

of

the

chip

which

exposes

the

silicon

wafer

underneath.

If

the

chip

is

exposed

to

ultra

violet

light

for

a

length

of

time

(approx

30

mins)

any

information

stored

in

the

chip

is

destroyed

-

clearing

the

chip,

which

can

then

be

re-programmed

as

required.

The

EPB

has

16K

Bytes

of

sample

ram

which

is

used

when

a

sound

is'

sampled.

This

ram

is

arranged

in

2

x

8K

blocks.

So

that

if

you

wish

to

sample

a

short

sound

you

can

switch

to

8K

and

save

on

the

cost

of

proms.

(8K

proms

being

approx

half

the

price

of

16K

proms).

The

process

of

recording

a

sound

is

as

follows:-

Select

record

ram.

Sample

Sound,

Playback

the

sample

sound

in

ram.

If

sound

is

ok

insert

prom

in

socket.

'Save*

ram

data

in

prom.

Playback

E-Prom.

c

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Sampling

-

A

brief

discussion

C

Fig.

1

is a

graph

of

amplitude

against

time of

somebody

singing

'Ahhh'.

The

amplitude

of

the

signal

can

be

represented

by

a

number

and

if

the

wave

form

is

measured

at

regular intervals

these

numbers

would

represent

the

•

change

in

amplitude

of

the

signal

over

time.

These

numbers

can

be

stored

in

a

prom

and

when

cycled

out and

converted

into

a

voltage

proportional

to

that

number

would

produce

the

wave

form

shown

in

Fig.2.

too

So-

25

*

\

rr

\

m

jL

■*-k

With

the

addition

of

filtering,

a

fairly

accurate

representation

of

the

original

wave

form

is

produced.

(Dotted

line).

*

It

can

be

seen

that

the

faster

the

sampling

the

more

accurate

the

reconstruction

will

be•

A

rule

of

thumb

being

that

you

need

a

minimum

of

two

samples

for the

highest

souTwal

^H7

IT

WlSh

t0

^J^

Eg'

If

the

highest

f"<^ncy

in

a

torn

sound

was

8KHZ

the

minimum

sample

rate

for

a

reasonably

good

sound

would

be

Ok

A

I

ss

lOMiZ

ie.

The

sound

is

sampled

16,000

times

a

second.

If

a

16K

E-Prom

is

used

then

it

can

be

seen

that

the

sample

will

only

last

for

one

second.

If

the

sound

is

longer

than

a

second

there are

tvo

things

that

you

can

do;

in't-and^tn

ST^'™"

"

^

l

of

the

durins

puyback-

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SUMMARY

1.

An

E-PROM

can

be

programmed

or

'blown1

with

numbers.

2.

These

numbers

can

represent

an

audio

waveform.

3.

The

larger

the

E-PROM,

the

more

numbers

it

can

store,

and

therefore

it

can

contain

a

longer

sound.

4.

The

larger

the

E-PROM

the

more

expensive

it

is.

5.

Once

programmed,

the

data

can

only

be

changed

by

exposing

the

chip

to

ultra

violet

light,

which

erases

all

the

information

stored.

6.

Once

erased

then

the

E-PROM

can

be

re-programmed.

For

further

information

on

PROMS

and

the

EPB

contact

the

Simmons

Sales

office

or

your

local

Simmons

stockists.

SDS1

TECHNICAL

Batteries

-

4 x

1.5

AA

Cells.

Battery

life

(constant

hitting)

8

Hours.

Standby

battery

life

(Jack

connected

Normal

use)

30

Hours,

Ext

Power

requirements.

-

$v

DC

at

50MA

via

3.5mm

Jack.

Ext

frig

Amplitude

-

.5

-

5

volts

via

3.5mm

Jack.

Output

level

(max)

-

2v

p-p.

Dimensions

(drum)

-

360

x

320

x

60

(excluding

turnkey).

Dimensions

(box)

-

416

x

416

x

136.

Weight

(drum)

-

1.5KG.

Weight

(packed)

-

3.3KG

(including

ARM

+

Ax2).

c

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-2

BC182

ZTX500

SDS1

-

PARTS

LIST

VARIABLE

RESISTORS

CAPACITORS

TR1

TR2

1

CS0700-182

CSO7OO-5OO

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-3

SDS1

-

PARTS

LIST

DIODES

(including

L.E.D.)

SOCKETS

ZIFS

Jl

CS1020-001

Spot

V

Toggle

JACKS

SI

CS1300-002

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i

•

>

.

i

I

■:•■.

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Simmons SD81 User manual

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