Majella MCVC Manuale utente

MCVC

DIY MANUAL

Version 1.0

MCVC

DIY Manual

INTRODUCTION

THE MCVC (MIDI to CV Converter)

The MCVC is a four-channel MIDI (Musical

Instrument Digital Interface) to Control

Voltage (CV) converter. The MCVC is a

straightforward interface between the

Eurorack synthesizer system and devices

that communicate using the MIDI -

protocol. The MIDI CV Converter bridges the

gap between MIDI and Eurorack systems,

by converting MIDI messages to control

voltages, corresponding to eurorack signal

standards.

CONTENTS

The MCVC comes in a box and is fully

assembled and tested. Included are a 16-

pin IDC power cable and M3 mounting

screws + rack crash protection washers.

SUPPORT

If you have any further questions or queries

please contact:

support@majella-audio.com

SPECIFICATIONS

Below are the specifications of the MCVC.

!!Dimensions 128,5 x 70,8 (14 HP) x

15mm

!!Doepfer A-100 compatible

!!16pin Power (

Using 5V rail!

)

!!Current usage: +12V 39mA, -12V

.25mA, 5V 30mA.

POWER CONNECTION

This Module is designed to be connected to

a Eurorack system power supply using a 16

pin ribbon cable. The -12V (red lead) should

be directed as shown in the picture below.

WARNING!

The MCVC is designed for Eurorack systems.

The supply should be +-12V and connected

signals should not be outside of the +-12V

range! Do not reverse polarity when

connecting the power, this will damage

your module permanently!

Please treat your Majella Audio products

with care. Majella Audio does not offer

warranty for any damages to the MCVC due

to accidental damages (fluid spills,

scratches, wrong input/output connections

etc.)

MCVC

DIY Manual

Requirements

The kit contains the PCB with all SMD parts

pre-soldered, panel and all electrical

components to finish the module. You will

need (as a bare minimum): basic soldering

tools and a Digital multimeter to finish this

module.

Required tools:

•!Soldering iron/station 

•!Soldering tin 

•!Wire cutter 

•!Multimeter (minimal 3 decimals)

•!Trim screwdriver (flat)

•!2 mm Allen key (hex key)

•!Nut driver (plier, at own risk)

Bill of materials (BOM)

To start, it is good practice to check if the kit

is complete. We double check the kitbags,

but its never a bad idea to triple check.

MCVC

DIY Manual

IC socket (1x 8 pin)

Its best to start with the lowest parts on the

top side of the MCVC printed circuit board

(PCB). The yellow marking in figure 1 shows

its placement.

Please note the orientation of the IC

(socket). The notch in shows where Pin 1 of

the socket is placed and should be pointed

upwards as shown in figure 1.

Figure 1: IC Socket placement

(YELLOW)

MCVC

DIY Manual

Capacitors (12x)

There are 12 capacitors (100nF) that need to

be soldered. The placement is shown in

figure 2 (yellow markings).

Figure 2: 100nF capacitors placement

(YELLOW)

MCVC

DIY Manual

Trimmer (1x)

Now we solder the trimmer. See figure 3 for

its placement (yellow marking). Mind its

orientation! The small trim screw should be

pointing towards the left as shown in figure

3 (yellow marking).

Figure 3: Trimmer (YELLOW)

MCVC

DIY Manual

Minijacks (17x) Take care on this one!

We advice to (without soldering) place the

jacks into the PCB (yellow marked, figure 4).

Then place the panel on the jacks. Carefully

turn around the MCVC and lay it down on

supports, as shown below in figure 5:

Figure 5: support

Solder one pin from each connector. Make

sure to press the panel so that each

minijack connector is tight pressed to the

PCB when soldering the pin. Check if all

minijacks fit tight between the panel and

PCB. Then solder the rest of the pins.

Figure 4: 3.5 mm minijacks (YELLOW)

MCVC

DIY Manual

Switch (1x)

Next up is the switch. It should be placed as

marked yellow in figure 6. Make sure it’s

tight to the PCB. When soldered, toggle the

switch downwards, this will make it easier

to fit the panel on top later on.

Figure 6: Toggle switch (YELLOW)

MCVC

DIY Manual

Headers (1x 16pin, 1x 6pin)

The 16pin header and the 6pin header

should be placed on the bottom side of the

PCB (the back of the module). This is show

in figure 7 (yellow marking). MIND its

orientation! The Notch is shown in figure 7.

Figure 7: Headers (YELLOW)

MCVC

DIY Manual

LEDs (4x)

There are 4 LED’s that need to be placed.

The orientation of each LED is very

important!

The anode (+ positive, long leg) is placed to

the left for LED 1 – 3, and placed to the right

for LED 4. This is shown in figure 9. The

anode (+ positive, long leg) is marked with a

red dot in figure 9.

Figure 9: LED orientation (YELLOW)

It helps to use the panel while placing the

LED’s so that they fit the panel nicely.

Figure 8: LED’s (YELLOW)

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