Velleman K8094 User manual

Allows you to record and play messages
of up to 8 minutes long.
ILLUSTRATED ASSEMBLY MANUAL H8094IP’1
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K8094
EXTENDED RECORD
PLAYBACK KIT
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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 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
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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
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- 5 -
DO NOT BLINDLY FOLLOW THE ORDER OF THE
COMPONENTS ONTO THE TAPE. ALWAYS CHECK THEIR
VALUE ON THE PARTS LIST!
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- 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
3
2
1IC-socket
4
IC1 : 28pIC2 : 8p
Ceramic Capacitor
5
c...
C10 : 47nF
Trimmer
6
Push buttons
7
SW...
SW1 : recordSW2 : playSW3 : eraseSW4 : next
Voltage regulator
8
VR...
VR1 : UA78L05
Pin-header
9
JP1 : 2pins
Microphone
10
MIC1
MIC1 : M300
DC-jack
11
SK1 : 9 ... 12VDC
Watch theWatch the
polarity!polarity!
RV1 :100K (Sample Freq.)
RV2 :10K(volume)
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- 7 -
Construction
Board-to-wire connector
12
SK2 : External control
Electrolytic capacitors
14
C...
C11 ... C13 :4,7μFC14, C16 : 220μF
Terminal block
15
SK5 : 2p(speaker)
LEDs
13
COLOR= 2...5
LD...
CATHODE
LD1 : 3mm green (power)LD2 : 3mm red (play/record)
Vertical cinch connector
16
J
SK3 : Line inSK4 : Line out
IC’s
17
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.
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- 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.
n
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e
ed.
ed
requen
cy”
”
e position
VD
C
12V
t
ern
al
d.
d.
Tur
tri
m
+-
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- 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
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- 10 -
R1
C3
SW
Sample freq.
RV1
C4
LINE IN.
MIC
MIC1
C5
9-12VDC. Line F.T.
R2
1
SK1
D1
ERASE.
C10
EXT. CONTROL
C9
IC2
Volume.
RV2
C8
C13
R8
IC1
R3
R7
C7
RECORD.
LINE OUT.
P8094'1
R10
PLAY.
SW2
C12
SW1
SK2
1
SW3
PLY/REC
VR1
LD2
C16
R6
C11
C6
C2
R5
C1 1.GND
LD1
6.Reset
5.Next
4.Erase
3.Play
2.Rec.
Velleman N.V.
NEXT.
SW4
R4
R9
SPEAKER
Control:
POWER
+ -
C14
PCB
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