Parallel Port 3 Axis CNC Driver, Opto-Isolated, Unipolar Steppers

Step 4 Capacitors, Headers, DB-25

C1 & C2 are 10uF Electrolytic

C3 is a 1uF Electrolytic

Capacitors first, these are polarized so they need to go in correctly.
The white stripe down one side of the capacitor is the negative pin.
In the top-side illustration the black half is the negative side.
*also shown in the image notes below.

Headers SV1 - SV5 are next.
If you are using locking headers consider what way you need the lock part facing.
Otherwise they can go in however.

SV1 is the Y axis motor
SV2 is the X axis motor
SV3 is the Z axis motor
SV4, pin 1&2 is Negative Supply
SV4, pin 3&4 is Positive Supply
SV5 is positive supply for the motors


The right angle, male, DB-25 port is last for this step.
*note: A female port will not work as the pinout is different. If you want to use a female port or a panel mount port, use some solid strand wire to run from the port to the PCB.

A right angle port can be kinda of tricky to get in, but get a thin piece of metal, a tweezers or nail, to pry and direct pins into their holes. Only pins 2-7 and 18-25 are used, so the other ones could be clipped off to make the placement easier.

Keep it flush with the PCB, nice and tight or later plugging and unplugging will damage on the connections. Then solder a few pins to keep it in place.

Flare out the mounting pins as pictured below, and solder.

Finish up the rest of the pins, remembering only pins 2-7 and 18-25 need to be soldered, the rest don't.