ESSENTIAL INFORMATION
BUILD INSTRUCTIONS
CHECKING YOUR PCB & FAULT-FINDING
MECHANICAL DETAILS
HOW THE KIT WORKS
KEEP YOURSELF COOL WITH THIS
USB FAN KIT
Version 1.0
USB Fan Kit Essentials
www.kitronik.co.uk/2162
Build Instructions
Before you start, take a look at the Printed Circuit Board (PCB). The components go in the side with the writing on
and the solder goes on the side with the tracks and silver pads.
1
PLACE RESISTORS
Start with the resistor R1. The text on the PCB shows where R1 should go. It doesn’t matter which
way around the resistor goes into the board.
PCB Ref
R1
PLACE THE FUSE
Value
15Ω
Colour Bands
Brown, green, black
2
Place the fuse into F1. It doesn’t matter which way around the fuse goes into the boards.
3
SOLDER THE SWITCH
Solder the PCB mounted right angled slide switch into SW1. The row of three pins that exit the back of
the switch must be soldered but it will not matter too much if you can’t solder the other two pins.
CONNECT THE POWER LEAD
4
The USB power lead needs to be connected. Feed the red and black wire of the lead through the
strain relief hole.
The red wire of the USB power cable is soldered to the power pad labelled ‘Red’ and the black
wire of the USB power cable is soldered to the power pad labelled ‘Black’.
5
CONNECT THE MOTOR LEAD & FAN
Finally, the motor lead needs to be connected. Feed the red and black wire of the lead
through the strain relief hole.
The red wire of the motor is soldered to the motor pad labelled ‘Red’ and the black wire of
the motor is soldered to the motor pad labelled ‘Black’.
Once soldered, push the plastic fan onto the motor shaft.
USB Fan Kit Essentials
www.kitronik.co.uk/2162
Checking Your USB Fan PCB
Check the following before you plug your fan into a USB port.
Check the bottom of the board to ensure that:
All holes (except the four large mounting holes and two strain relief holes) are filled with the lead of a
component.
All these leads are soldered.
Pins next to each other are not soldered together.
Check the top of the board to ensure that:
The red wire on the USB power cable is connected to the power connector labelled ‘Red’ and the black wire
on the USB power cable is connected to the power connector labelled ‘Black’.
The red wire on the Motor is connected to the motor connector labelled ‘Red’ and the black wire on the
Motor is connected to the motor connector labelled ‘Black’.
USB Fan Kit Essentials
www.kitronik.co.uk/2162
How the USB Fan Works
The circuit diagram for the USB Fan is shown above. It is a very simple circuit. The 5V that powers the circuit is
supplied from the USB connector.
The low power motor in this fan has been selected to not draw too much current from a computer USB port. If it was
powered directly from 5V it would take more current, and possibly damage a computer. The 15Ω resistor drops the
voltage down, reducing the voltage to prevent this happening in normal operation.
If the Fan becomes jammed then the motor will stall, and start to take more current. The fuse will protect the USB
port if this happens.
Finally, the on / off switch allows the circuit to be opened and closed: open the switch to turn the Fan off and close
the switch to turn the Fan on.
USB Fan Kit Essentials
www.kitronik.co.uk/2162
Designing the Enclosure
When you design the enclosure, you will need to consider:
•
The size of the PCB.
•
Where the on / off switch is mounted.
•
There are four 3.3mm holes in the corners of the PCB to secure the PCB in the enclosure.
The following technical drawings of the built USB Fan PCB and motor should help you to design your enclosure.
43
The four mounting holes are all 4mm from
the board edge.
The assembled PCB is approximately 10 mm
tall including solder points.
The Fan is 90mm in diameter, and
approximately 18mm in depth.
4
2.5
4
1
7 2.6
18
4
6
28
4 x 3.3mm mounting holes
Mounting the PCB to the enclosure
The drawing below shows how a hex spacer
can be used with two bolts to fix the PCB to
the enclosure.
Your PCB has four mounting holes designed
to take M3 bolts.
1.6
Dimensions in mm
Motor Dimensions
能源基础设施
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