Velleman K4102 Manuale utente

K4102

ILLUSTRATED ASSEMBLY MANUAL H4102IP-1

Total solder points: 79

Difficulty level: beginner 1 2 3 4 5 advanced

Practicetheguitarwithoutdisturbing

others.

GUITAR PREAMPLIFIER WITH HEADPHONE OUTPUT

Features:

An electric guitar cannot be connected to just any amplifier or audio installation. This preamplifier has been

designed for this purpose and provides you with a headphone output, allowing you to practice without

disturbing others. Moreover, it is fitted with a special device for tone adjustment, allowing anyone to create

their personal sound.

 sound adjustment

 adjustable input sensitivity

 low noise

 housing included

Specifications:

 Headphones output: max. 2 x 50mW / 32ohm

 Power supply: 9V battery (not incl.)

 Dimensions: 70 x 30 x 105mm (2.8" x 1.2" x 4.1")

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 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.

• 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 !

DO NOT BLINDLY FOLLOW THE ORDER OF THE

COMPONENTS ONTO THE TAPE. ALWAYS CHECK

THEIR VALUE ON THE PARTS LIST!

Construction

 R1 : 470K (4 - 7 - 4 - B)

 R2 : 470K (4 - 7 - 4 - B)

 R3 : 47K (4 - 7 - 3 - B)

 R4 : 10K (1 - 0 - 3 - B)

 R5 : 10K (1 - 0 - 3 - B)

 R6 : 10K (1 - 0 - 3 - B)

 R7 : 68 (6 - 8 - 0 - B)

 R8 : 68 (6 - 8 - 0 - B)

 R9 : 390 (3 - 9 - 1 - B)

 R10 : 2,2 (2 - 2 - B - B)

 R11 : 2,2 (2 - 2 - B - B)

2. 1/4W Resistors

R...

 ZD1 : 4V7

1. Zenerdiode. Watch the

polarity!

ZD...

CATHODE

 C1 : 470pF (471)

 C2 : 10nF (103)

 C3 : 33nF (333)

 C4 : 33nF (333)

 C5 : 100nF (104)

 C6 : 100nF (104)

 C7 : 470nF (474)

 C8 : 470nF (474)

 C9 : 470nF (474)

3. Capacitors

 IC1 : 8p

4. IC socket. Watch the

position of the notch!

 RV1 : 100K

 RV2 : 1K

5. Resistor trimmers

 SW1

6. Switch

SW.. .

 C10 : 220µF

 C11 : 220µF

 C12 : 220µF

Watch the polarity!

7. Electrolytic Capacitors

C...

Construction

 J1 GUITAR IN

 J2 LINE OUT

8. RCA connectors

...

 J3 : 3,5mm stereo phone

9. Headphones connector

J...

10. LED

LD...

CA TH ODE

23mm

0.9"

18mm

 LD1 : 3mm red

 IC1 : NE5532A

11. IC. Watch the position of

the notch!

The connection leads are first

plaited through the openings to

reduce pulling. The red is

connected to the "+" and the

black to the "-".

12. Battery snap

E...

BLACK

RED

Fig 1.0

Assembly in the housing

13. Assembly in the housing

 Attach the sticker showing the connections to the housing, fig 4.0.

 Mount three spacers to the bottom of the housing, together with a shakeproof washer and an M3

countersunk bolt, see figure 2.0

 Mount the PCB on the spacers using the three M3 bolts

 Click the shaft into the tone-control potentiometer and mount the knob on the shaft, fig 3.0

 After connection of the 9V battery (check the polarity), the cover of the housing can be

clicked in place.

HOUSING

6mm M3 BOLT

PCB

LOCK WASHER

8mm M3 SPACER

4mm M3 BOLT

Fig 2.0

Fig 3.0

Assembly in the housing

Tone control

Power led

Level adjustment

Power on/off

Headphones

Output

Guitar IN

Fig 4.0

Sticker

 Connect a 9V battery and switch the equipment on. The LED should normally light up. This LED is also used as a

"battery low" indication.

 Turn potentiometer RV1 to the middle of its adjustment range and connect a pair of headphones to the unit. A slight

hum should be heard in the headphones when the central terminal of the input connector is touched. Turn the tone

control RV2 clockwise and slight noise should be heard.

 The guitar can be connected to the input connector by using a suitable cable. The sensitivity can be controlled using

"RV1".

 The output connector can be connected to the "TAPE IN" or "AUX" input of a stereo system. Be very careful with

the volume knob so that you do not damage your expensive speakers.

14. Test & use

Test & use

15. Schematic diagram.

Schematic diagram

R-HEADPHONE

GND

L-HEADPHONE

R10

C10

R11

C11

TONE

RV1

ZD1

LD1

C12

SW1

+9V

LEVEL.ADJ

RV2

BATTERY

GND

GUITAR.IN

GND

LINE.OUT

GND

CONTROL

Indice

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