Velleman K4304 User manual

10 LED MONO VU METER
K4304
ILLUSTRATED ASSEMBLY MANUAL H4304IP-1
Total solder points: 93
Difficulty level: beginner 12345 advanced
Addavisualreadouttoyourexistingor
newequipment.

2
Features:
 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 connection 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.
Specifications:
 1 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 to 30KHz
 Low input for 0dB: 150mV to 6Vrms (47K)
 High input for 0dB: 1.5V to 60Vrms (470K).
 Power supply : 10 to 15VDC / 110mA max.
 PCB Dimensions : 68X37mm
 NOT SUITED FOR CONNECTION TO HIGH POWER CAR STEREO SYSTEM
Features & Specifications

3
Assembly hints
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 oftenon a wet sponge or cloth, to keepit clean; then apply solder to the tip, togive it a wetlook. This is called ‘thinning’ and will
protect the tip,and enables youto make goodconnections. When solder rolls off the tip,it needs cleaning.
• Thin raisin-core solder. Do not use any flux or grease.
• A diagonal 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. A basic 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.
⇒ 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.
0.000

4
Assembly hints
1.3 Soldering Hints :
1- Mount the component against the PCB surface and carefully solder the leads
2- Make sure the solder joints are cone-shaped and shiny
3- Trim excess leads as close as possible to the solder joint
REMOVE THEM FROM THE TAPE ONE AT A TIME !
AXIAL COMPONENTS ARE TAPED IN THE COR-
RECT MOUNTING SEQUENCE !

5
Construction
 D1 : 1N4148
 D2 : 1N4148
2. Diodes. Watch the polarity !
D...
CATHODE
 ZD1 : 6V2
3. Zenerdiode. Watch the
polarity !
 R1 : 47K (4 - 7 - 3 - B)
 R2 : 47K (4 - 7 - 3 - B)
 R3 : 330 (3 - 3 - 1 - B)
 R4 : 10K (1 - 0 - 3 - B)
 R5 : 10K (1 - 0 - 3 - B)
 R6 : 2K2 (2 - 2 - 2 - B)
 R7 : 470K (4 - 7 - 4 - B)
5. Resistors
R...
CATHODE ZD...
 IC1 : 8p
 IC2 : 18p
6. IC sockets. Watch the
position of the notch!
 J1
 J2, mount for BAR mode, do
not mount for DOT mode.
1. Jumper wires
+3
+3
+2
+2
+1
+1
0dB
0dB
-1
-1
-3
-3
-5
-5
-7
-7
-10
-10
-20
-20
BAR DOT
 D3 : 1N4007
4. Diode. Watch the polarity !
D...
CATHODE

6
 IC1 : UA741
 IC2 : LM3916
Construction
 C1 : 220nF (224)
 C2 : 220nF (224)
7. Capacitors.
11. IC’s. Watch the polarity !
C...
 R8 : 68 (6 - 8 - 0 - B )
10. 1W resistor
R...
2mm
 RV1: 220K
(Sensitivity)
8. Trim potentiometer
 C3 : 47µF

C4 : 47µF
 C5 : 47µF
9. Electrolytic Capacitors.
Watch the polarity !
C...
-

7
Construction
 Remark: Depending on your application, these LED’s can be mounted perpendicular
or parallel (see also points 13 and 14):
Perperdicular mounting : Parallel mounting :
12. MOUNT THE LEDs (Check the polarity)
PCB
SOLDER
SIDE
LED
13mm
SOLDER
PCB
SIDE
LED
 LD1 : green
 LD2 : green  LD3 : green  LD4 : green  LD5 : green  LD6 : green  LD7 : green  LD8 : yellow  LD9 : yellow  LD10 : red LD...
CATHODE

8
Ø3.5
52
60
7
4.5
Parallel mounting
13. PARALLEL MOUNTING (optional)
(A) Make the holes in the housing or panel (fig.1.0) :
(B) Mount the suitable spacers (fig. 2.0) :
6mm M3 COUNTERSUNK-HEAD BOLT
LOCK WASHER
10mm M3 SPACER
FRONTPANEL
2...3mm FRONTPANEL
10mm M3 SPACER
LOCK WASHER
Fig. 2.0
Fig. 1.0

9
6mm M3 COUNTERSUNK-HEAD BOLT
4mm M3 BOLT
2...3mm FRONTPANEL
10mm M3 SPACER
4mm M3 BOLT
PCB
LOCK WASHER
(C) Mount the PCB onto the spacers (fig 3.0) :
Fig. 3.0
Parallel mounting

10
14. PERPENDICULAR MOUNTING (optional)
Fig. 4.0
(A) Make or search for a suitable bracket :
(B) Make the holes in the housing or panel and
mount the bracket (fig. 5.0) :
Fig. 5.0
Perpendicular mounting
LOCK WASHER
M3 NUT
10mm M3 COUNTERSUNK-HEAD BOLT
BRACKET
FRONTPANEL
LOCK WASHER
M3 NUT
2...3mm FRONTPANEL
BRACKET