Arcadian Rhythms Assembly Instructions

Thank you for purchasing the Synthrotek Arcadian Rhythms Eurorack kit. This is pretty easy build but there are some important steps that you MUST follow.

Please build according to the BOMand not these instructions or the pictures alone. Some components may have changed since these were written, or we may not be able to get the same components that are in the pictures.

Let’s begin!

Take the green PCB and carefully break off the smaller portion from the larger.

Resistors & 4×1 Header

Take the 6 resistors and place them into the panel as shown below. Resistors are not polarized, so you can place them either way. Turn over to solder then clip excess leads. KEEP YOUR RESISTOR CLIPPINGS, THEY WILL BE USED LATER!

Solder in the 4×1 header to rear of the small PCB

Arcadian Rhythms Resistors and Header
Arcadian Rhythms Resistors and Header

Trimmer Resistors and Jacks

Carefully solder in the three jacks as show below and then place the three trimmer resistors into the large PCB. Carefully turn the PCB over and solder in place.

Solder in the three jacks into the small board as shown below.

Arcadian Rhythms - Trimmers and Jacks
Arcadian Rhythms – Trimmers and Jacks

10 Pin Power Header

Next, align the notch on the 10 pin Eurorack power connector with the notch in the silkscreen, as shown below. Flip the board over and solder everything in place.

Arcadian Rhythms - 10 Pin Header
Arcadian Rhythms – 10 Pin Header

4×1 Socket

Place the 4×1 Pin socket into the PCB, carefully turn over and solder into place as shown below.

Arcadian Rhythms 4x1 Socket
Arcadian Rhythms 4×1 Socket

Long Pin Standoffs

Screw in the 4 long pin standoffs as shown below

Arcadian Rhythms - Long Standoffs
Arcadian Rhythms – Long Standoffs

Buttons and Panel Connection

First, connect the small PCB with the jacks to the panel and hand-tighten the nuts.

Next, marry the panel and large PCB and secure the panel to the standoffs with the black hex screws.

NOTE! Some arcade buttons have one set of leads that are SHORTER than the others. If you have these kind (as shown below), you will have to attach your excess resistor lead clippings to the shorter leads so that they will fit through the PCB. If all the leads on the button can be inserted directly into the PCB, disregard this part.

Arcade Button Leads Extended
Arcade Button Leads Extended

You can now place the arcade buttons into the project as shown below. The arcade buttons will only fit into the PCB pads ONE WAY! Make sure you align the solder pads with the orientation with the leads of the arcade buttons!

Arcadian Rhythms Board Connection
Arcadian Rhythms Board Connection

After you have the arcade button pins aligned with the solder pads, CAREFULLY turn the project over. Take a good look at the solder pads to make sure that the arcade button pins (or resistor clippings) are through the holes.

Arcadian Rhythms Board Connection - 2
Arcadian Rhythms Board Connection – 2

Finally, solder the arcade button leads into place. Clip any excess leads if you used resistor clippings.

Arcadian Rhythms Board Connection - 3
Arcadian Rhythms Board Connection – 3

Trimmers: The three trimmers control the brightness of the LEDs. LED brightness can vary between different colors, and even between switches of the same color. We recommend turning them all the way clockwise, then adjusting to taste.

Way to go! It’s time to push some buttons!