AVD Audio MP312-4 Manuel utilisateur

FOUR CHANNELS MIC PREAMP MP312-4

Assembly Manual

MP312-4 Four Channels Mic Preamp.

Hello DIY lovers!

Thanks for choosing AVDAUDIO!

We are proud to introduce our new MP312-4 Four Channels Mic Preamp.

This unit was made based on vintage API312 version preamp.

Unit has four independent channels. Each channel has:

input gain and output attenuator

phantom power supply bottom +48v

-20Db pad input gain bottom

phase reverse bottom

mute bottom

The box is with external power supply.

If you had bought this DIY Kit, hope this manual help you to complete this

unit. And we hope it will be easy to build and will give you pleasure!

We wish you happy DIY moments with this kit and please contact us at

[email protected] if you have any questions.

Let's start this build!

FOUR CHANNELS MIC PREAMP MP312-4

•Descriptions and material for building.

The MP312-4 DIY kit contains:

•Metal case with front panel and power supply case.

•PCBs (Main PCB and power supply boards)

•Power transformer (115V or 230V included)

•Four variable potentiometers for preamp gain

•Four T-Pad 600ohm attenuators

All parts are marked on PCB. This includes two markings –NAME and VALUE.

These parts can be found in the BOM here download MP312-4 BOM>>>

Or follow this link: http://www.avdaudio.com/files/boms/BOM3124.pdf

What you will need for build:

•soldering station

•basic understanding of components

•DIGITAL MULTIMETER to check VALUE of capacitors and

resistors.

•You can also use a table with resistor color codes, which

can be found here: resistor color code information>>>>

Or copy this link: http://www.resistorguide.com/resistor-color-code/

All capacitors (electrolytic, ceramic) are clearly labeled, but you may also check these

values with a digital MULTIMETER!

Electrolytic capacitor:

FOUR CHANNELS MIC PREAMP MP312-4

Ceramic capacitor:

IMPORTANT!

To avoid any mistakes after the order of the components check each component by

multimeter! Make sure that it corresponds to the nominal value indicated on the PCB

and place them on a blank sheet with the measured values. Want to remind to you:

•Resistors are not polarized elements

•All diodes are directional! Make sure you insert them in the correct direction.

•Film capacitors are polarized elements

•But ceramic capacitors are not polarized

Remember please!

Unit has four same channels. We will build this, based only on the one channel. Others

channels be assembled by the same way. But other important steps we will show

separately.

2) Second step we start to build preamp with main PCB.

All parts you need for this board you can find in the BOM. Marked “Preamp parts”

Here is a picture of Preamp PCB:

FOUR CHANNELS MIC PREAMP MP312-4

Preamp PCB has four same channels. All channels are identical. Manual shows building

of one channel only. Build other channels by the same way. Others important moment

will show you separately.

Let’s start main PCB!

Solder all resistors and diodes.

Each channel has one diode 1N4004 and eleven resistors. Next nominal of resistors you

can use per channel: 160R, 200R, 510R, two of 750R, 5K1, two of 6K98, 10K, 20K, 150K.

Do the same on each other channels!

In the end of this step you must solder two diodes 1N4004 on the power side of the

board! You can soldering two power capacitor (100uf/50v) this step as well. Or soldering

as we do it after! But it helps you to do this easily now!

FOUR CHANNELS MIC PREAMP MP312-4

Don’t forget about one 10K resistor. It is on the right side of board for power led diode!

Find three different ceramic capacitors on the each channel: 120pf, 220pf and two ps of

1000pf. Each capacitor is marked:

120pf capacitors are marked as:

FOUR CHANNELS MIC PREAMP MP312-4

220pf capacitors are marked as:

1000pf capacitors are marked as:

FOUR CHANNELS MIC PREAMP MP312-4

Placed each capacitor and solder these:

1000pf capacitor is (two ps):

FOUR CHANNELS MIC PREAMP MP312-4

220pf and 120pf capacitors are placed:

Place 4 pushbuttons per each channel on the board:

FOUR CHANNELS MIC PREAMP MP312-4

To be sure before solder! Push button placed directly on the PCB. Must not have any

distance from PCB!

Turn up board and solder each push button. You can solder at first only one leg of each

pushbutton. Try to press switch to pin on PCB. Then check you have all switches directly

on PCB. And solder other legs.

FOUR CHANNELS MIC PREAMP MP312-4

Do not recommend cut push button’s legs.

For DOA we use HARWIN sockets.

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