Erica Synths EDU DIY Wavefolder Eurorack Module Kit User Manual

Page 50

In order to save space on the PCB, some of our projects, including the Wavefolder,

have vertically placed resistors. The next step is to place & solder those. All

components on the PCB have both their value and denomination printed onto the

silkscreen. If you are not sure about a resistor’s value, use a multimeter to

double-check. Bend a resistor’s legs so that its body is aligned with both legs and

insert it in its designated spot. Then solder the longer lead from the top side of the PCB

to secure it in place, turn the PCB around and solder the other lead from the bottom.

You can insert several resistors at once. Once done with soldering, use pliers to cut off

excess leads.

Next up: insert & solder the electrolytic

capacitors. Electrolytic capacitors are

bipolar, and you need to mind their

orientation. The positive lead of each

electrolytic capacitor is longer, and there

is a minus stripe on the side of the

capacitor’s body to indicate the negative

lead. On our PCBs, the positive pad for the

capacitor has a square shape, and the

negative lead should go into the pad next

to the notch on the silkscreen.

Then insert and solder the transistors.

Make sure you place correct transistors in

relevant places (we use both NPN BC548

and PNP BC558) and align them with the

marked outline on the silkscreen –

orientation is critically important here.

Also, insert film capacitors and solder

them.

Then complete the component side of the

Mixer PCB by soldering the PSU socket

and multiturn trimmer potentiometer.

Make sure the orientation of the socket is

as shown in the picture below – the arrow

pointing to the first pin is aligned with a

notch on the silkscreen. The key on the

socket will be facing inwards the PCB.

Now your PCB should look like this: