3. Assembly and Reflow

Assembly Time!

Now that you have deposited solder paste on your circuit, all that is left to do is place your components and reflow the solder on the board.

Surface Mount Components

The circuit requires the following components that have been included with the voltage regulator kit:

• Linear regulator IC × 1

• Switching regulator IC × 1

• Blue LED × 2

• 330Ω resistors × 2

• 0.1µF capacitors × 2

• 100µF capacitors × 3

• 330µF capacitor × 1

• Diode × 1

• 330µH inductor × 1

• Wire connector × 6

• Battery Connector × 1

• 9V battery × 1

Carefully place your components onto the corresponding pads, as shown in the board layout below.

Use the tweezers included with the V-One to place components precisely.

Do not smear the solder paste when placing components. Once they are placed, press down gently so the components rest evenly on the pads.

Both the LED and the Electrolytic Capacitors have a polarity. Remember to double-check that they are placed in the correct orientation before you solder them to the board. When in doubt, reference the circuit schematic shown above.

LED Corner cutout indicates this components cathode side

The solid paint stripe indicates this components negative terminal

The solid paint stripe indicates this components negative terminal

The solid stripe on this component indicates the cathode side

Once all of the surface mount device (SMD) components are placed, proceed to the HEAT step.

Even though diodes are typically marked where the cathode is, there are of course exceptions to this rule. Because of this it is very important to carefully review the datasheet of every diode/LED that you plan to use in your future designs.

Reflow

Now that all of the surface mount components are placed, the circuit is ready to be reflow soldered.

1. From the start menu, select the HEAT option.

2. Click the REFLOW tile.

3. Select the solder paste you're using, based on the lot name printed on the cartridge label.

4. Click REFLOW to start the process.

The V-One gets hot while reflowing. Do not touch! Do not leave unattended while heating!

When the heating cycle finishes, the V-One will start glowing blue. This means the soldered PCB is safe to remove.

The Result

Plug in the 9V battery and watch your circuit come alive. If everything is working, the LED will be lit, and you should be able to measure 5V from the output side of the board.

Both the top two and bottom two sets of pads will output 5 volts.

You can use this circuit to provide a steady source of 5V power to other connecting boards, such as the pulse generator kit.

Congratulations, you have completed the Voltage Regulator circuit board!

That concludes the tutorial. If you ran into any hiccups along the way, let us know at [email protected].

As a reminder, this circuit is part of a set of circuits designed to work together in a series. Although this circuit operates normally on its own, we recommend completing the pulse generator circuit and the 99 decimal counter circuit for a well-rounded learning experience.

Pulse Generator Project

99 Decimal Counter Project