Velleman High-Q K2572 User manual

UNIVERSAL STEREO

PREAMPLIFIER K2572

-Gain (presettable) : 40 dB

-Frequency response : 40Hz -30KHz (-3dB)

-Maximum input signal : 50mVrms (500mVrms)

-Output impedance : 1Kohm

-Power supply : 10 -30 VDC, regulated

-Supply current : typ. 5mA

-Dimensions : 44 x 65 mm (1.73" x 2.56")

VELLEMAN COMPONENTS NV

Legen Heirweg 33

9890 Gavere

Belgium

www.velleman.be

K2572 3

While the soldering iron is heating, read this first !

You want to enjoy your Velleman Kit as quick as possible, these

hints will assist you !

First, take your time. Hasty jobs often result in disappointments.

Make sure your workspace is wide, clean and well lit. Collect all

the necessary tools you might need for the assembly. Take

care, while unpacking that nothing is left in the wrapping or

boxes, such as small parts, manuals and leaflets. Please check

if all components are present. Use the supplied partlist as a

guide. In case there is something missing or damaged, return

the Kit to your dealer. Read all supplied manuals and notes

carefully before you start constructing...

The Velleman Kit Warranty

Please read this carefully. In most cases, you can easily solve

problems yourself. This text tells you all about.

The Kit, you have built or intend to build, was design by a team

of highly skilled design engineers. Before their design reaches

the customer, it has been tested and re-tested over and over

again. This procedure guarantees you that every design actually

works, when it is put together in the right way. But what if

something does go wrong ?

Avoid unnecessary expenses and loss of time ! Examine the

whole circuit closely. An even better procedure is to let

someone else do this for you. Every tiny detail is important. Are

all components put in the right place and correctly oriented.

Watch out for bad or forgotten solder joints and short-circuits !

What about the power supply ? Is it correct and present ? Does

the Kit require special calibration or adjustment ? Do the

possible external devices such as computers, audio sources or

power circuits match the Kit specifications ?

K2572 4

When all the above did not bring you any closer to a solution,

start thinking of a defective part or parts. Semiconductors like

transistors, FET’s, IC’s and processors, although very reliable

do not support abuse. You can send us suspect

semiconductors for inspection and eventual exchange but keep

in mind. Our experienced technicians can tell the difference

between a defective and a fried transistor, and in several cases

a stamp is much more expensive than a replacement

semiconductor bought at the local store.

Any Velleman-Kit if defective will be repaired or replaced at our

option within 30 days of purchase.

Simply return it to the place of purchase with proof of purchase.

K2572 5

INTRODUCTION

This universal pre-amplifier kit replaces the long-running K1803.

It has been upgraded with a low-noise integrated circuit and is

stereo instead of mono.

For audiophiles with a turntable who wish a complementary

phono amplifier, the K2573 stereo RIAA kit is fully compatible

with the K2572.

TECHNICAL DATA

Power supply : 10VDC minimum to 30VDC maximum, from a

stable source

Current consumption (no signal, no load) : typically 5mA

Amplification (adjustable) : 40 dB

Frequency range : 40Hz—30KHz -3dB

Output impedance : 1KΩ

Maximum input signal : 50mV (500mV)

UNIVERSAL STEREO PREAMPLIFIER ASSEMBLY

AND TOOLS

Check that you have all the parts.

RECOMMENDED TOOLS

Miniature 25W soldering iron

Multicore solder

Soldering iron stand and sponge

K2572 6

ASSEMBLY

1. RESISTORS

Start assembly with the resistors .They are not polarized, so

they can be inserted in either direction. Only the three primary

color bands are mentioned. There may be a fourth band which

can be ignored.

Inventory

Sequence

of assembly

Reference Part number / description

mmR1 22KΩ(red-red-orange)

mmR2 22KΩ(red-red-orange)

mmR3 1MΩ(brown-black-green)

mmR4 1MΩ(brown-black-green)

mmR5 10KΩ(brown-black-orange)

mmR6 10KΩ(brown-black-orange)

mmRV1 Trim pot 1KΩ

mmRV2 Trim pot 1KΩ(These may be

flat as well as vertical)

2. CAPACITORS

These capacitors are not polarized, so they can be inserted

either way.

Inventory

Sequence

of assembly

Reference Part number / description

mmC4 100 nF Sibatit capacitor

(Sometimes marked as 104)

K2572 7

3. THE ELECTROLYTIC CAPACITORS

Note carefully the positive leads before you fit the capacitor into

the PCB board. Watch the polarity !

Inventory

Sequence

of assembly

Reference Part number / description

mmC1 10 µF electrolytic capacitor

mmC2 1 µF electrolytic capacitor

mmC3 1 µF electrolytic capacitor

mmC5 1 µF electrolytic capacitor

mmC6 1 µF electrolytic capacitor

mmC7 1 µF electrolytic capacitor

mmC8 1 µF electrolytic capacitor

4. SOCKET

Inventory

Sequence

of assembly

Part number / description

mmIC socket

Mount IC socket where marked "IC1"

5. INTEGRATED CIRCUIT (IC)

Inventory

Sequence

of assembly

Reference Part number / description

mmIC1 8-pin integrated circuit

Mount the IC on its socket,

the notch being turned

toward C1.

K2572 8

USAGE

10 connections are provided on the PCB to connect the circuit

with signal inputs, grounds and power supply. These

connections are identical to those of the RIAA K2573; you can

connect them by the numbers.

1. ground

2. out left

3. ground

4. in left

5. ground (power supply)

6. plus (power supply)

7. in right

8. ground

9. out right

10. ground

The ground connections near the IN and OUT connections are

used to connect the stranded wires (-) of the connecting leads.

The output amplitude of the right and the left channel are totally

independently controlled by RV1 for the right channel and RV2

for the left channel.

As current consumption is very low, voltage can be taken from

any stable power supply of between 10VDC and 30VDC. Lower

the gain from 100 to 10 if the input signal is higher than 50mV;

this is done by replacing R5 and R6 with 100kΩresistors.

REMARKS

An unstable power supply will give noise and hum. The leads to

and from the PCB must be as short as possible and use only

screened wires

Never place the preamp in the vicinity of transformers or mains

power lines

K2572 9

Universal Stereo Mono Preamplifier

PCB Layout and component placement

K2572 10

Modifications and typographical errors reserved

©Velleman Components nv.

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