Dreadbox DYSMETRIA Instructions for use

1. Before you get started
1.1 Tools you will use
1.2 Bill of Materials
2. Soldering the Components
STEP 1 Resistors
STEP 2 Diodes
STEP 3 IC sockets, Headers and Power Board
STEP 4 Capacitors and Remaining Components
STEP 5 The Control Board
STEP 6 Connections
Manual
CONSTRUCTION

1. Before you get started
1.1 Tools you will use
The following tools are required for this assembly, but they are not included in the KIT:
- a soldering Iron with variable temperature setting
- a small sponge for cleaning the soldering iron
- a cutter
- solder wire (two kinds suggested 0,5mm and 1,5 mm)
- a small at screw driver
- a USB adapter 1A or more
- a USB type A to type B cable
- a multimeter
- 2x crocodile test cables
- 1x 3,5mm patch cable
Before you start the construction of this DIY project, make sure you have basic soldering skills and
that you can identify the electronic components. If it is your rst time soldering, there are several
tutorials on youtube that can help you :)
It would be easier and helpful for you to work on a big desk, so as to have plenty of space to work on.
Also a room with an open window would be ideal while you solder.
Before you start the soldering process, make sure you have all the components needed and noted in
the BILL OF MATERIALS SECTION. Please note that we might have added more components than
needed or less (hopefully not). It would be very helpful if you count all the components before starting
the project (but without removing these from their bags).
Make sure to READ THE MANUAL before you start assembling!

1.2 Bill of Materials or What's in the box?
BAG 1
BAG 2
POWER
BOARD
BAG 3
PANEL
CONTROL PCBVOICING PCB

Qty Value Notes
610mm plastic spacer BAG 1.1
611mm plastic spacer BAG 1.1
615mm plastic spacer BAG 1.1
210mm metal spacer BAG 1.1
1M3 nut BAG 1.1
21mm washers BAG 1.1
14 M3x6 Black Bolt BAG 1.1
51k Trimmer BAG 1.2
1100k Trimmer BAG 1.2
11N4148 diode BAG 1.2
21n4007 diode BAG 1.2
43v6 zener diode BAG 1.2
45v1 zener diode BAG 1.2
116MHz Crystal BAG 1.2
2LM1117 voltage regulator 5V BAG 1.2
22N3904 transistor BAG 1.2
1TL431 voltage reference @ 2V5 BAG 1.2
322p capacitor BAG 1.3
6220p capacitor BAG 1.3
31n capacitor BAG 1.3
24n7 capacitor BAG 1.3
310n capacitor BAG 1.3
23 100n capacitor BAG 1.3
3470n capacitor BAG 1.3
33u3 electro capacitor BAG 1.3
247u electro capacitor BAG 1.3
13 220 resistor BAG 1.4
41k resistor BAG 1.4
22k7 resistor BAG 1.4
29 10k resistor BAG 1.4
718k resistor BAG 1.4
22 22k resistor BAG 1.4
530k resistor BAG 1.4
10 49k9 resistor BAG 1.4
10 100k resistor BAG 1.4
2270k resistor BAG 1.4
5470k resistor BAG 1.4
1Miniature slide switch BAG 1.5
1USB type B jack BAG 1.5
1ATMEGA328 MCU BAG 2
16N137 optocoupler BAG 2
125AA320A-I/P eprom BAG 2
174HC165 shift register BAG 2
1LM324 op amp BAG 2
1MCP4822-E/P DAC BAG 2
3TL074 op amp BAG 2
3DIP8 IC socket BAG 2
4DIP14 IC socket BAG 2
150 pin Female head BAG 2
12u2 Elec cap BAG 2
15 Mini stereo jack 3.5mm BAG 3.1
2Push button with Red led BAG 3.2
1Rotary switch 4 positions BAG 3.2
210KB rotary potentiometer BAG 3.2
2Pot washer BAG 3.2
2Pot nut BAG 3.2
14 10KB slide potentiometer , 30mm travel BAG 3.3
3ON/ON switch (two position) BAG 3.4
3ON/OFF/ON switch (three position) BAG 3.4
2Small knob BAG 3.4
1Large knob BAG 3.4
1Ribbon cable BAG 3.4
1Midi adapter from 3,5mm to DIN5 cable BAG 3.4
1Voicing PCB
1Control PCB
1Power PCB
1Panel
1DIP16 IC socket BAG 1.5
1DIP28 IC socket BAG 1.5
110 pin header male BAG 1.5
220 pin header female BAG 1.5
110 pin header female BAG 1.5
1Ribbon header male BAG 1.5
Qty Value Notes

2. Soldering the components
STEP 1 - Resistors (bag 1.3)
Remove all the resistors from Bag 1.3. Before
you start soldering, measure them and note their
value on their tape, as shown on the photos.
Remember that resistors have a 1% to 5%
tolerance, so for example, a 10k resistor might be
measured from about 9.500 ohm to 10.500 ohm.
The maximum temperature for this step on the soldering iron should be 380º C.
We strongly suggest though, to set it at about 310º-320º degrees.

A few tips for soldering leaded components
Remove parts that are about
to be soldered from their tape.
Prepare all the components that need to be bend before soldering.
With the cutter, cut carefully all the
excess leads.
Bend these as shown. This is the wrong way.

1k Resistors: Let’s start! Find and solder the 1k resistors.
2k7 Resistors: Find and solder the 2k7 resistors.

10k Resistors: Find and solder the 10k resistors.

18k Resistors: Find and solder the 18k resistors.

22k Resistors: Find and solder the 22k resistors.

30k Resistors: Find and solder the 30k resistors.
49k9 Resistors: Find and solder the 49k9 resistors.

100k Resistors: Find and solder the 100k resistors.
270k Resistors: Find and solder the 270k resistors.

470k Resistors: Find and solder the 470k resistors.

220 Ohm Resistors: Find and solder the 220 Ohm resistors.

STEP 2 - Diodes (bag 1.2)
Remove all the parts that are included
in the 1.2 Bag . You should have the
items shown in the picture.
Max temperature of the soldering
iron, for this step should be 320º C. We
usually prefer to have it set at about
290º C, just to be on the safe side.
The single diode that is not in a tape is the 1n4148. Solder it to the control board as shown.

Now locate and solder the 3v6 zener diodes. They are marked with a “3” on their tape.
Now locate and solder the 5v1 zener diodes. They are on the leftover unmarked tape of 4pcs.

Next come the 1N4007 diodes. Those serve as reverse power protection for the power supply.
On the top side of the voicing PCB, you will place the crystal. This serves as a clock for the MCU.
Solder it as shown.

Now it is time to solder the 5V regulators. They are fed with 12V and convert this to 5V. There are two
of them, as you always want to have separate rails for the digital and the analog path.
Solder them as shown.
Get the 100k Trimmer and solder it as shown.

Finally, solder the rest of the trimmers, marked as 1k.
You should have the following parts as leftovers from this step, 2x 2n3904 and the TL431.
Put them to the side, as we will solder them later on.

STEP 3 - IC sockets, Headers and Power Board (bag 2)
Remove all the IC sockets that are included
in Bag 2. Put the rest of the parts back to
the bag.
Max temperature of the soldering iron, for
this step, should be 350º C.
Solder the IC sockets as shown.
Things you should be careful about:
1. The socket orientation
2. Make sure the sockets are placed rmly on the board. You can start by soldering only 1 pin, ip the
board to check and if they are ok, solder them down.