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.

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

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

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 !

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

0dB

-1

-3

-5

-7

-10

-20

BAR DOT

 D3 : 1N4007

4. Diode. Watch the polarity !

D...

CATHODE

 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...

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

Ø3.5

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

6mm M3 COUNTERSUNK-HEAD BOLT

4mm M3 BOLT

2...3mm FRONTPANEL

10mm M3 SPACER

4mm M3 BOLT

PCB

LOCK WASHER

Fig. 3.0

Parallel mounting

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

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