Velleman K8094 User manual

Allows you to record and play messages

of up to 8 minutes long.

ILLUSTRATED ASSEMBLY MANUAL H8094IP’1

ILLU

LLU

STRA

TED

ASS

ASSE

MBLY

BLY

MAN

UAL

H809

4IP’

P’

’

K8094

EXTENDED RECORD

PLAYBACK KIT

฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀ ฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀฀

The K8094 allows you to record and play messages of up to 8 minutes long.

Recording speed is continuously adjustable so that you can choose a perfect compromise between duration and sound quality. It

also allows you to generate funny sound effects. Messages are retained in memory at power loss. The unit comes complete with

microphone, line level in- and output and an output for a small speaker. Applications: Play messages in musea, stores, interactive

installations, scale models, toys, as doorbell, gadget, etc…

Features

record duration:•

o standard quality: 8 minutes

o high quality: 2 minutes 40s.

built-in microphone• line level in- and output• pushbutton control•

(suited for open collector control)

Speciﬁcations

power supply: 9...12VDC• consumption:•

o idle: <15mA

o playback: 100mA max.

speaker output: 500mW (8 ohm - 10% THD)• adjustable sample speed: 4...12KHz• memory write up to: 100.000 recordings• operating temp. range: 0..50°C / 32...122°F• dimensions: 110x75x25mm / 4.33 x 2.95 x 0.98”•

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Supply voltage (V) - led voltage (V)

required current (A) = series resistance (ohms)

Required resistor power handling=

voltage over resistor x current passed trough resistor

9V - 1.7V

0.005A = 1460 ohm

9V - (3 x1.7V)

0.005A = 780 ohm

(9V - 1.7V) x 0.005A = 0.036W

closest value :

use a 1k5 resistor

use an

820 ohm resistor

a standard 1/4W resistor

will do the job

Supply voltage (V) - (number of leds x led voltage (V))

How to Calculate the series resistor:

Example: operate a red led (1.7V) on a 9Vdc source.

Required led current for full brightness: 5mA (this can be found in the datasheet of the led)

LEDs in series:

Example: 3 x red led (1.7V) on 9V battery

Required led current for full brightness: 5mA

(this can be found in the datasheet of the led)

series resistor:

Leds feature a speciﬁc voltage

drop, depending on type and

colour. Check the datasheet for

exact voltage drop and rated

current !

Never connect leds in parallel

Leds and how to use them

An open collector output can be compared to a switch which switches to

ground when operated

Example: How to switch an LED by means of an open collector output

open collector outputs

assembly

hints

- 4 -

1. Assembly (Skipping this can lead to troubles ! )

Ok, so we have your attention. These hints will help you to make this project successful. Read them carefully.

1.1 Make sure you have the right tools:

A good quality soldering iron (25-40W) with a small tip.• Wipe it often on a wet sponge or cloth, to keep it clean; then apply solder to the tip, to give it a wet look. This is called ‘thinning’ and• will protect the tip, and enables you to make good connections. When solder rolls off the tip, it needs cleaning.

Thin raisin-core solder. Do not use any ﬂux or grease.• Adiagonal cutter to trim excess wires. To avoid injury when cutting excess leads, hold the lead so they cannot• ﬂy towards the eyes.

Needle nose pliers, for bending leads, or to hold components in place.• Small blade and Phillips screwdrivers.Abasic range is ﬁne.•

For some projects, a basic multi-meter is required, or might be handy

1.2 Assembly Hints :

Make sure the skill level matches your experience, to avoid disappointments.• Follow the instructions carefully. Read and understand the entire step before you perform each operation.• Perform the assembly in the correct order as stated in this manual• Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.• Values on the circuit diagram are subject to changes, the values in this assembly guide are correct*• Use the check-boxes to mark your progress.• Please read the included information on safety and customer service•

* Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’ on a separate leaﬂet.

1.3 Soldering Hints :

Mount the component against the PCB surface and carefully solder the leads1.

Make sure the solder joints are cone-shaped and shiny2.

Trim excess leads as close as possible to the solder joint3.

0.000

- 5 -

DO NOT BLINDLY FOLLOW THE ORDER OF THE

COMPONENTS ONTO THE TAPE. ALWAYS CHECK THEIR

VALUE ON THE PARTS LIST!

- 6 -

Construction

R...

R1 ... R3 : 4K7 (4 - 7 - 2 - B)R4, R5 : 1K (1 - 0 - 2 - B)R6 : 100K (1 - 0 - 4 - B)R7 : 47K (4 - 7 - 3 - B)R8 : 390 (3 - 9 - 1 - B)R9 : 10 (1 - 0 - 0 - B)R10 : 10K (1 - 0 - 3 - B)

Resistors

Ceramic Capacitor

C1 ... C9 : 100nF

Diode (Check polarity!)

CATHODE

D...

D1: 1N4007

1IC-socket

IC1 : 28pIC2 : 8p

Ceramic Capacitor

c...

C10 : 47nF

Trimmer

Push buttons

SW...

SW1 : recordSW2 : playSW3 : eraseSW4 : next

Voltage regulator

VR...

VR1 : UA78L05

Pin-header

JP1 : 2pins

Microphone

MIC1

MIC1 : M300

DC-jack

SK1 : 9 ... 12VDC

Watch theWatch the

polarity!polarity!

RV1 :100K

(Sample Freq.)

RV2 :10K(volume)

- 7 -

Construction

Board-to-wire connector

SK2 : External control

Electrolytic capacitors

C...

C11 ... C13 :4,7μFC14, C16 : 220μF

Terminal block

SK5 : 2p(speaker)

LEDs

COLOR= 2...5

LD...

CATHODE

LD1 : 3mm green (power)LD2 : 3mm red (play/record)

Vertical cinch connector

SK3 : Line inSK4 : Line out

IC’s

Watch theWatch the

polarity!polarity!

Watch theWatch the

polarity!polarity!

IC1 : ISD17240PY

(voice REC/playback chip)

IC2 : LM386

Sampling Frequency

Turn RV1 left to decrease the sample

rate and increase the total recording

time, turn it fully clockwise to de-

crease the total recording time. The

shorter the recording time the higher

the quality of the played message.

- 8 -

Basic connection diagram

Max. 12VDC

(8ohm - 10% THD)

500mW

Light up when power

supply is connected.

Remove shunt when internal

microphone is needed.

Basic connection diagram

- 8 -

Turn the “sample frequency”

trimmer into centre position.

Turn the “volume”

trimmer into middle

position.

int

ed.

requen

cy”

”

e position

12V

ern

Tur

tri

- 9 -

Extended possibilities

Record a message:

Keep button1. SW1 pressed to record.

Release button2. SW1 to end recording.

Repeat this procedure to record a nextmessage.

Play latest recorded message:

Brieﬂy press button SW2 to play the latest

recorded message.

Play all messages:

Keep button SW2 pressed to play all

message, releasing the button will end the

play-function.

Play next message:

Each time you press the button SW4 you

move the memory pointer 1 recorded mes-

sage further

Erase latest message:

Brieﬂy press button SW3 to erase latest

recorded message. Led LD2 will ﬂash 2x to

conﬁrm.

Erase all messages:

Keep button SW3 pressed to erase all

recorded messages. Led LD2 will ﬂash 9x

to conﬁrm.

Line out (ex. ampliﬁer)

When you use a “line in” input mount

a jumper on JP1 to disable the internal

microphone.

Use the “Line out” output if the internal

ampliﬁer is not be sufﬁcient enough.

Extended possibilities

SW1SW1 SW2SW2 SW3SW3SW4SW4 **

redred

OrangeOrange

YellowYellow

GreenGreen

BlueBlue

BrownBrown

Line in (ex. CD-player)

Reset the position off the memory pointer

and place it at the begin of the latest recorded

message. when you then press the ‘play’- but-

ton the latest record message

will be played.

Optional: connect up

to 5 external control

buttons, relay contact or

“open-collector” outputs

- 10 -

Sample freq.

RV1

LINE IN.

MIC

MIC1

9-12VDC. Line F.T.

SK1

ERASE.

C10

EXT. CONTROL

IC2

Volume.

RV2

C13

IC1

RECORD.

LINE OUT.

P8094'1

R10

PLAY.

SW2

C12

SW1

SK2

SW3

PLY/REC

VR1

LD2

C16

C11

C1 1.GND

LD1

6.Reset

5.Next

4.Erase

3.Play

2.Rec.

Velleman N.V.

NEXT.

SW4

SPEAKER

Control:

POWER

+ -

C14

PCB

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