DNOU1K Assembly

Table of Contents

Step by Step Instructions

Please read Getting Started with DNOU1K before assembling the board.

Step by Step Instructions #

Secure the board with a PC Board holder or other method.

The board has been placed in a PCB holder, set so that the holder won’t interfere with parts placement and soldering. The PCB holder isn’t necessary, but it sure is nice if you do a lot of assembly.

Insert the ULN2803 IC into the holes where shown. Note the orientation of the Pin 1 mark on the case.

If you do not have a chip insertion tool, insert the pins on one side of the IC into the corresponding holes. Then, using your fingers to press on the case/pins on the opposite side, put just enough pressure on the IC to flex without damaging the inserted pins and insert the opposite row into their respective holes. Use cross lock tweezers to hold the chip tightly against the board.

Turn the board upside down and solder 18 pins.

Turn the board right side up and, using the same techniques as before, insert the 74HC595 IC into the holes where shown. Again, note the orientation of the Pin 1 mark on the case and use cross lock tweezers to secure the part to the board.

Turn the board over and solder 16 pins.

Now insert and solder the LEDs and the 2kΩ resistors. The long lead of an LED is the anode — inserted it into the hole with the square pad. Bend the leads on the bottom of the board to hold the parts in place while soldering. Flush cut the excess leads after soldering.

Next, insert and solder the 8 output resistors, bending the leads on the bottom of the board to hold them in place.

The leads from the output resistors have been bent to secure the resistors for soldering.

Solder the resistors, then flush cut the excess leads.

The last parts to install are the terminal blocks. These are “rising cage” terminal blocks, providing superior wire hold across a range of wire gauges. Before installing the blocks, inspect them and use a screw driver to lower the cage (turning the screw to the left) and fully open the terminals. Note that the terminals are shipped by the manufacturer in a “closed” state which looks “open” because the cage is at the top of its travel without any wire.

Insert and solder the 9 port terminal block.

Finally, insert the 3 port terminal blocks on the other end and solder in place. If you prefer, you can replace any 3 port terminal block with a pin header using the same pitch: 2.54mm/.1″.