Velleman K1803 User manual

K1803

ILLUSTRATED ASSEMBLY MANUAL H1803IP'2

T ot al sold e r poi n ts: 29

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

Thiskithasbeendevelopedaspre-modulefor

anumberofaudioapplicationswherethereis

insufficientinputsignal.Applicationsasa

microphonepre-amplifierorforlevelcorrection.

UNIVERSAL MONO PREAMPLIFIER

Specifications

 Power supply: 10-30VDC / 10mA.

 Output impedance: 1Kohm.

 Adjustable output level: max. 40dB.

 Frequency range: 20Hz to 20kHz ± 3dB.

 Max. input signal: 40mV.

 PCB dimensions: 30 x 40mm (1.2" x 1.57").

VELLEMAN NV

Legen Heirweg 33

9890 Gavere

Belgium Europe

www.ve llem an.be

www.velleman-kit.com

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 oft en on a wet s p onge or cl oth, t o k ee p it cl ean; th en ap ply sol de r t o t he ti p, t o gi ve it a wet look . Th is is c al le d ‘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.

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 !

You will find the colour code for the resistances on our website: www.velleman.be

DO NOT BLINDLY FOLLOW THE ORDER OF THE

COMPONENTS ONTO THE TAPE. ALWAYS CHECK

THEIR VALUE ON THE PARTS LIST!

 R1 : 100K (1 - 0 - 4 - B)

 R2 : 100K (1 - 0 - 4 - B)

 R3 : 100K (1 - 0 - 4 - B)

 R4 : 100K (1 - 0 - 4 - B)

1. Resistors

R...

 IC1 : 8p

2. IC socket, Watch the po-

sition of the notch!

 AF IN (2 x)

 AF OUT (2x)

 Power (+)

 Power (-)

4. PCB pins

Constructi o n

 RV1 : 220K (250K)

6. Trim potentiometer

RV.. .

 C1 : 10µF

 C2 : 10µF

 C3 : 10µF

 C4 : 10µF

 C5 : 10µF

5. Electrolytic capacitors.

Watch the polarity !

C...

 IC1 : LM358

 Pay attention

to the

position of

the notch!

7. IC mounting

 R5 : 100K (1 - 0 - 4 - B)

 R6 : 100K (1 - 0 - 4 - B)

 R7 : 2K2 (2 - 2 - 2 - B)

3. Vertical resistors

R...

8. Connection

Conne c tion

 Connect a stabilized supply between 10 and 30V with the points “+” and “-” on the print.

 The input is connected on the points “AF IN”.

 The output is taken on the connection “AF OUT” and the ground “-”.

 To connect your in– and output you’d better use a screened wire, this to avoid interferences and rumble

 With the trimmer RV1 you can control the output signal between 0 and max.

Connec tion e xa mple

Dyna mic mi crop hone

Telephone pick up coil

...

MAX. 40mV

To : Amplifier, Mixing

panel, Tape recorder, ...

10 ... 30VDC

INPUT

OUTPUT

9. Schematic diagram.

Schematic diagram & PCB

100K

10µ

GND

10µ

SK1

AF IN

SK2

AF OUT

IC1A

IC1B

10µ

2K2

100K

RV1

220K

10. PCB

Modifications and typographical errors reserved

H1803IP - 2010 - ed.2

VELLEMAN NV

Legen Heirweg 33, 9890 Gavere

Belgium - Europe

5 410329 434977

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