Velleman-Kit K4305 User manual

Total solder points: 186
Difficulty level:
Beginner 1o2þ3o4o5oAdvanced
PARTLIST H4305P-ED1
K4305
2 x 10 LED STEREO VU METER
•For instant visualization of audio signal levels.
•Easy hook up to a LINE level ( LOW input) signal source.
•For use with mixing panels, amplifiers, CD players, radio’s, ...
•A special input (HIGH INPUT) is provided, which allows direct con-
nection to a SPEAKER* output .
•DOT or BAR display mode selectable to suit your application.
•Attractive display window supplied, which can be used both horizontal
as vertical.
•If wanted, the unit can be calibrated by means of a trim potentiometer.
*NOT SUITED FOR CONNECTION TO HIGH POWER CAR STEREO
SYSTEM
Specifications:
•2 X 10 LED’s
•BAR OR DOT MODE
•INDICATION RANGE: 0dB = 0.775mVrms.
-20dB, -10dB, -7dB, -5dB, -3dB, -1dB, 0dB, +1dB, +2dB, +3dB
•FREQUENCY RANGE: 20Hz tot 30KHz
•LOW INPUT FOR 0dB: 150mV to 6Vrms (47K)
•HIGH INPUT FOR 0dB: 1.5V to 60Vrms (470K).
•POWER SUPPLY: 10 to 15VDC / 250mA max.
•PCB DIMENSIONS 2X: 68X37mm
modifications reserved

5%
4K7= ( 4 - 7 - 2 - B )
1%
4K7= ( 4 - 7 - 0 - 1 - 1 )
COLOR= 2… 5
IPESF SDK NDGB FNL
C
O
D
E
CODICE
COLORE
CODIGO
DE
CORES
CODIGO
DE
COLORES
VÄRI
KOODI
FÄRG
SCHEMA
FARVE
KODE
FARGE
KODE
FARB
KODE
COLOUR
CODE CODIFI-
CATION
DES
COU-
LEURS
KLEUR
KODE
C
O
D
E
0
Nero Preto Negro Musta Svart Sort Sort Schwarz Black Noir Zwart 0
1
Marrone Castanho Marrón Ruskea Brun Brun Brun Braun Brown Brun Bruin 1
2
Rosso Encarnado Rojo Punainen Röd Rød Rød Rot Red Rouge Rood 2
3
Aranciato Laranja Naranjado Oranssi Orange Orange Orange Orange Orange Orange Oranje
3
4
Giallo Amarelo Amarillo Keltainen Gul Gul Gul Gelb Yellow Jaune Geel 4
5
Verde Verde Verde Vihreä Grön Grøn Grønn Grün Green Vert Groen 5
6
Blu Azul Azul Sininen Blå Blå Blå Blau Blue Blue Blauw 6
7
Viola Violeta Morado Purppura Lila Violet Violet Violet Purple Violet Paars 7
8
Grigio Cinzento Gris Harmaa Grå Grå Grå Grau Grey Gris Grijs 8
9
Bianco Branco Blanco Valkoinen Vit Hvid Hvidt Weiss White Blanc Wit 9
A
Argento Prateado Plata Hopea Silver Sølv Sølv Silber Silver Argent Zilver A
B
Oro Dourado Oro Kulta Guld Guld Guldl Gold Gold Or Goud B

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3
ASSEMBLY STEPS
Required tools to assemble the kit:
A small soldering iron of max. 40W.
Thin (1mm) solder, do not use any flux.
A small cutter to trim the excess wires.
1.
2.
3.
4.
Mount the compo-
nents against the
PCB surface and
carefully solder the
leads.
Obtain cone-shaped,
shiny soldered joints
by heating the com-
ponent leads suffi-
ciently.
This solder joint
results in a bad
connection.
Trim the excess
wires up to the
level of the sol-
der
•Careless assembly will certainly lead to troubles.
•Insert the part, oriented correctly, into its correct holes on the PCB.
•Mount the components in the correct order as stated in this manual.
•The component values in the diagram are for reference only. The val-
ues in this partlist are correct and must be followed.
•Use the boxes qto tick off your progress.
FBefore starting to build, also read the general guidelines

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4
Assembly
Mount all components onto the PC boards (mount the two boards)
1. JUMPERS
qJ1
qJ2, mount for BAR mode, do
not mount for DOT mode.
BAR DOT
+3
+3
+2
+2
+1
+1
0dB
0dB
-1
-1
-3
-3
-5
-5
-7
-7
-10
-10
-20
-20
2. DIODES (Check the polarity)
D...
CATHODE
qD1: 1N4148
qD2: 1N4148
qD3: 1N4000… 1N4007
3. ZENER DIODES
(Check the polarity)
ZD...
CATHODE
qZD1: 6,2V (6V2)

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5
4. ¼W RESISTORS
R...
qR1: 47K (4-7-3-B)
qR2: 47K (4-7-3-B)
qR3: 330 (3-3-1-B)
qR4: 10K (1-0-3-B)
qR5: 10K (1-0-3-B)
qR6: 2K2 (2-2-2-B)
qR7: 470K (4-7-4-B)
5. IC SOCKETS
(Check the position of the notch)
IC...
1
qIC1: 8P
qIC2: 18P
6. RESISTOR TRIMMERS
RV...
qRV1: 220K (250K)
7. CAPACITORS
C...
qC1: 220nF (0.22µF, 224)
qC2: 220nF (0.22µF, 224)
8. ELECTROLYTIC CAPACITOR
(Check the polarity)
C...
+
qC3: 47µF
qC4: 47µF
qC5: 47µF

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6
9. 1W RESISTORS
R...
2mm
qR8: 68 (6-8-0-B)

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7
10. MOUNT THE LEDs, BEND THE LEADS CAREFULLY
(Check the polarity)
PCB
SOLDER
SIDE
LED
qLD1: green (5)
LD...
COLOR = 2...5
CATHODE
qLD2: green (5)
qLD3: green (5)
qLD4: green (5)
qLD5: green (5)
qLD6: green (5)
qLD7: green (5)
qLD8: yellow (4)
qLD9: yellow (4)
qLD10: red (2)

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8
11. Insert the IC’s in the socket (Check the position of the notch)
IC...
PIN 1
1
qIC1: 741
qIC2: LM3916
Mount the units in a suitable housing or on a suitable panel:
12. Mounting possibility:
A. Make or search for suitable bracket:

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9
B. Make the holes in the housing or panel and mount the bracket:
4.5
Ø3.5
7
7
15
60
52
LOCK WASHER
M3 NUT
10mm M3 COUNTERSUNK-HEAD BOLT
BRACKET
FRONTPANEL
LOCK WASHER
M3 NUT
2...3mm FRONTPANEL
BRACKET

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10
C. Mount the PCB’s with spacers onto the bracket:
15mm SPACER
2...3mm FRONTPANEL
PCB
40mm M3 BOLT
40mm M3 BOLT
BRACKET
BRACKET
15mm SPACER
FRONTPANEL
PCB
M3 NUT
LOCK WASHER
SOLDER
SIDE
15mm SPACER
15mm SPACER
M3 NUT
LOCK WASHER

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11
Connect the unit to a suitable signal, this can be line level (LOW input) :
13. Connecting to a line level output (tuner, preamp, cd player… )
and connecting a power supply from 10 to 15VDC / 250mA max..
12V/250mA
12V/250mA
12V/250mA
MAINS
MAINS
FROM AUDIO AMPLIFIER
R
10...15VDC
1000uF/25V
+
1000uF/25V
1N4007
1N4007
+
SUPPLY
POWER
+
HIGH IN
LOW IN
+P4304
RIGHT
LOW IN
HIGH IN
+P4304
LEFT
L
TAPE
OUT
Connect the unit to a suitable supply voltage between 10VDC and
15VDC, this can also be a standard DC adapter. You can also build
your own power supply, see diagram. Use a 2x12V transformer, two
rectifier diodes and a electrolytic capacitor or use a single 12V trans-
former with a bridge rectifier and a electrolytic capacitor.

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12
Connect the unit to a speaker output (HIGH input):
14. Connecting to a speaker level output and connecting a power
supply from 10 to 15VDC / 250mA max..
12V/250mA
12V/250mA
12V/250mA
FROM POWER AMPLIFIER
MAINS
MAINS
SPEAKER RIGHT
-
+
INPUT (0)
10...15VDC
1000uF/25V
1N4007
+
1000uF/25V
1N4007
+
POWER
SUPPLY
+
LOW IN
HIGH IN
+P4304
SPEAKER LEFT
+
-
HIGH IN
LOW IN
+P4304
RIGHT
LEFT
Connect the unit to a suitable supply voltage between 10VDC and
15VDC, this can also be a standard DC adapter. You can also build
your own power supply, see diagram. Use a 2x12V transformer, two
rectifier diodes and a electrolytic capacitor or use a single 12V trans-
former with a bridge rectifier and a electrolytic capacitor.

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13
Connect the unit to a car radio:
15. Connecting to a speaker output from a regular car radio.
R-
+12V ANTENNE POWER OUT
CAR RADIO
RIGHT SPEAKER
R+
LOW IN
+
P4304
HIGH IN
HIGH IN
LOW IN
P4304
+
L+
L-
LEFT SPEAKER
LEFT
RIGHT
The 12VDC car battery power or car radio antenna output can be used
to supply the VU meter.
REMARK: Do not connect the unit to a high power car booster or car
stereo, this equipment uses isolated ground connection. The connection
to this kind of amplifier can cause permanent damage to the amplifier or
car radio!
•Adjust the units sensitivity according to your preference by means of
the trim potentiometer RV1

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14