Division 6 Dual Mini Manual

Dual Mini Synthesizer Build Instructions

Make sure you have everything before you start soldering!

Install Diode

What You’ll Need:

To make assembly easier, we’re going to install components from shortest to

tallest. This way when you ip the board over to solder them, your work

surface will hold them in place. Let’s start with the diode.

To prep the leads, hold the body of the diode and bend the two leads 90

degrees.

Insert the diode into the holes marked D9 on the main PCB. Polarity does

matter for diodes, so when you insert it into the board, make sure the black

stripe on the diode lines up with the stripe on the silkscreen pattern.

Bend the leads outward underneath the board to hold the diode in place.

Flip the board over, solder the diode leads, then trim them just above the

solder joint.

For a quick soldering tutorial, visit division-6.com/solder

·Dual Mini Synthesizer Kit · Soldering Iron · Solder · Wire Cutters · Small Phillips Screwdriver · 9mm Nut Driver

Install Resistors

Working one value at a time, prep the leads of the resistors like you did with

the diode.

Insert the resistors into their proper locations (see BOM). Polarity doesn’t

matter for resistors, but your board will look neater if you line up all the

tolerance bands (gold) the same direction. Bend the leads outward

underneath the board to hold the resistors in place.

Flip the board over, solder the resistor leads, then trim them just above the

solder joint.

Install Ceramic Capacitors

Install and solder C3-C6. Polarity doesn’t matter for these capacitors.

Install IC Sockets

Page 1/4

Polarity doesn’t matter

Polarity DOES matter

Continued...

Insert the IC sockets into the board. Note that one end of each socket has a

notch in it to indicate which end of the IC has pin 1. Make sure to align these

notches with the notches indicated on the silk screen pattern.

Flip the board over and solder one pin on each corner of both sockets. This

makes it easy to reposition the sockets in case they aren’t seated all the way

down against the board; just reheat the corner pins and adjust the socket

positions as necessary.

Once you are happy with the positioning of the sockets, solder the remaining

pins. The pins are short enough that they don’t need to be trimmed.

Dual Mini Synthesizer Build Instructions

Install Power Connector

Insert P3 into the board, aligning the notch in the connector with the notch

indicated on the silkscreen pattern. Make sure the connector is at against the

board, then solder it into place. The pins are short enough that they don’t

need to be trimmed.

Page 2/4

Install Electrolytic Capacitors

Insert C1, C2, C7, and C8 into the board. Polarity does matter for electrolyt-

ics, so make sure the (-) stripe is lined up with the - (round) hole on the PCB

(and is opposite the “+” marking on the silkscreen pattern). Solder the

capacitors into place and trim the leads.

Install Regulator

Insert VR1 into the board, making sure the at side of the part is lined up with

the at side on the silkscreen pattern. Solder and trim the leads.

Flip the board over! From here on out, all the parts go on the other side

Install LEDs

Slip an LED spacer onto each LED D1-8.

Insert the LEDs into the PCB and bend the pins outward to hold the LEDs into

place. Polarity does matter for LEDs; you’ll notice that they all have a at

side on their package. If the at side is hard to see, each LED also has a long

and a short pin to indicate polarity.

FLAT SIDE = SHORT PIN = NEGATIVE (-) = SQUARE PAD ON PCB

It doesn’t really matter which color you put where, but the LEDs in your kit

were chosen with the following layout in mind:

You may want to temporarily t the front panel in place to make sure all the

LEDs are straight and line up with the LED holes in the panel. Solder and trim

the leads.

Install Pots

Dual Mini Synthesizer Build Instructions

Page 3/4

Attach Standos

Using 2 silver screws, attach the 2 standos so that they protrude from the

same side of the board you just installed the pots on. The holes for the

standos aren’t labeled, but they have thick silver rings around them.

Insert all the pots, making sure they are as straight and at to the PCB as

possible. Solder one mounting tab on each pot. Temporarily install the front

panel to ensure all the pot shafts are poking through the center of their holes.

If any pot needs adjustment, simply heat up the one tab you soldered and

adjust the positioning of the pot.

Once all the shafts are lined up to your satisfaction, solder the remaining pins

on the pots.

Install Buttons

Insert tact switches S1-S4 into the PCB. They t 2 dierent ways, and either

way is ne. They will snap into place, making it easy to ip the board over and

solder them. Make sure they are at and straight as you insert them. You may

want to temporarily place the the front panel to make sure the buttons line up

with the holes in the panel. Once everything is lined up, solder the button

pins. The pins are short enough that they don’t need to be trimmed.

Install 3.5mm Jacks

Insert J1-J26 into the main PCB, soldering one pin of each as you go to hold it

in place. Check to make sure that they are at against the board and lined up

with the silkscreen pattern; reheat and reposition if not. Place the front panel

on the jacks to ensure alignment, and solder the remaining pins.

Be careful here, because there’s one pot per synthesizer that’s dierent from

the rest! R7 and R20 are 1M (say B105 on the bottom), where all the others are

10k (say B103 on the bottom).

Continued...

Dual Mini Synthesizer Build Instructions

Page 4/4

Install Front Panel

Place the front panel on the module. Install the hex nuts on all the jacks.

Screw the two black screws into the standos to hold the top of the panel in

place.

Install Microcontrollers

Before inserting U1 and U2 into their sockets, you may need to bend the pins

inward a bit so that they’ll line up with the holes. Lay each IC on its side on a

at surface, then gently press down on the top of the chip so that the pins

bend evenly. Repeat for the other side of each chip.

Insert the chips into their sockets, making sure that the pin 1 notches on each

chip and socket are aligned with each other. Both ICs are identical, so it

doesn’t matter which chip goes into which socket.

Power Up

THE END

That’s it, you’re nished! It’s time to test out your handiwork. Connect the

module to a Eurorack power supply using the provided cable. Turn on the

power.

Both the synthesizers should blink their rmware revisions on the LEDs, then

the LFO LEDs should start blinking at LFO rate.

Connect the OUT jack to an amplier/speaker. Make sure the FILTER pot is all

the way up and LFO>VCO and LFO>VCA are set to the 12:00 positions. Press

the GATE button; you should hear some audio.

Now you can use the controls to dial in the sound you want.

Troubleshooting:

·If the module has no power at all, check to make sure the diode is

installed the right direction. Also use a voltmeter to verify that your

Eurorack power supply is working.

·If any LED seems to be stuck on, it may be installed backwards.

·For any other problems, start by checking all your solder joints. They

should look shiny and smooth, not dull. Look for blobs and shorts

between adjoining pads.

Calibration instructions can be found at

division-6.com/dualsynth

Still have problems? Email us at [email protected]!

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