Erica Synths EDU DIY Wavefolder Eurorack Module Kit - 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:
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