Velleman High-Q Kit K1803 User manual

UNIVERSAL MONO PREAMPLIFIER
K1803
ILLUSTRATED ASSEMBLY MANUAL H1803IP-1
Total solder points: 29
Difficulty level: beginner 12345 advanced
Thiskithasbeendevelopedaspre-modulefor
anumberofaudioapplicationswherethereis
insufficientinputsignal.Applicationsasa
microphonepre-amplifierorforlevelcorrection.

2
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 44mm (1.2" x 1.7").
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 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 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. Alwayslook 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
CORRECT MOUNTING SEQUENCE !
You will find the colour code for the resistances and the LEDs in the HALG
(general manual) and on our website: http://www.velleman.be/common/service.aspx

5
 R1 : 2K2 (2 - 2 - 2 - B)
 R2 : 220K (2 - 2 - 4 - B)
 R3 : 22K (2 - 2 - 3 - B)
 R4 : 22K (2 - 2 - 3 - B)
1. Resistors
R...
 IC1 : 8p
4. IC socket, Watch the po-
sition of the
 AF IN (2x)
 AF OUT
 +
 -
5. PCB pins
Construction
 RV1: 1K
2. Trim potentiometer
RV1
 C1 : 10µF
 C2 : 1µF
 C3 : 1µF
3. Electrolytic capacitors.
Watch the polarity !
C...
 IC1 : UA741M
 Pay attention to the position
of the notch!
6. IC mounting

6
7. Connection
Connection
 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 between the outer right connection “AF OUT” and the mass “-”.
 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.
AF OUT
AF IN
+-
R1
R2
R3
R4
C1 C2
IC1
RV1
C3
10 - 30V DC
+-
Dynamic microphone
Telephone pick up coil
Max. 40mV
Etc... +
--
+Amplifier
Mixing panel
Tape recorder
Other application
TO :
INPUT OUTPUT
Connection example

7
8. Schematic diagram.
Schematic diagram & PCB
R4
22K
R3
22K
R1
2K2
R2
220K
C2
1µF
C1
10µF
C3
1µF
RV1
1K
GND
IC1
741
+V
AF IN
AF OUT
AF OUT
AF IN
+-
R1
R2
R3
R4
C1 C2
IC1
RV1
C3
9. PCB

Modifications and typographical errors reserved
© Velleman Components nv.
H1803IP - 2004 - ED1 (rev1)
VELLEMAN Components NV
Legen Heirweg 33
9890 Gavere
Belgium Europe
www.velleman.be
www.velleman-kit.com
5410329 310318

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