Assembly & Terminal options

Choose from several types of terminals:

• 5.08mm spaced thumb/screw terminals – most convenient and quick to use at input, can also be mounted at output
• “GOLD” banana jack/screw terminals – mount on input/output
• low profile banana jack terminals – mount on input/output
• pin headers may also be soldered at various points for easy snap-on DMM probing
• dedicated pin-hole output for low inductance oscilloscope probing
• many other potential options

The “gold” terminals mount in the smaller aperture of the terminals. A set of 3D-printed half-moon washers are provided to prevent these terminals from sliding in the mounting hole.

The lower profile banana jacks will mount in the larger apertures of the output terminals.

The above photo also illustrates the suggested mounting configuration for the terminals, but you may mount in any other way you find useful.

Some of the gold terminals may not flat mount on the PCB, and so it’s recommended to use the included washers to help keep them straight and make good contact.

Here is another mounting example by a user who chose not to use the 3D printed inserts, the extensions of the rectangular washers could be bent like the photo shows or cut off entirely:

Case modifications

The PCB mounting pillars in the provided ABS case are slightly recessed. If you use the green thumb terminal (which extends beyond the PCB and the case wall) you must make a 12mm wide notch to seat the terminal properly and avoid the risk to damage it or its solder joints when you screw the PCB to the case. Draw the outline of this notch with a marker and use a utility knife or equivalent tool to carefully carve this notch out.

It may also be convenient to make a rectangular cutout in the provided ABS enclosure for easy USB port access. Draw the outline of this cutout with a marker, then you may use a thin drill to carve out the bulk of the hole, then carefully remove the edges with a utility knife.

Dimensions and offsets are illustrated below, make sure to be careful and safe when using sharp tools:

If you solder the optional buzzer, you will also need to remove the retainers shown below, opposite the USB connector, where the buzzer will be next to the case wall, to make room for it: