DeskFan | Portable power supply for 3pin pc fans | Li-on 18650

Power supply for 3pin 12V PC fan. (Adjustable voltage from 3V to 28V)

Requires 2 M3x4mm screws to hold the electronics.

Charges the battery at 1A maximum. There are 2 led indicators visible from the side and bottom: Red = charging , Blue = Charged / waiting for battery

BOM (Bill of material)

Electronics:

• 1x Li-Ion 18650 battery

• 1x TP4056 Usb-C charging module

• 1x Boost Converter MT3608 (voltage booster)

• Mini digital display Voltmeter (28mm between holes)

• 2x KCD11 switch (10x15mm) 250V 3A

• 3 Pin connector (Arduino type)

Uses a spring and a metal plate :

• metal plate size 13*11mm

• spring length 9mm

(These plates can be obtained from electronic device containing a return between 2 batteries see photo "XXXXXXXX")

Size once assembled (Lxhxp): 150x23x26mm

/!\ Printing without support for "Bati.stl" and "Cover.stl" (supports are integrated).

Parts requiring supports : "Spring.stl" , "Fixing PCBs.stl"

STL file:

3Pin Holder-1.STL

AntislideTP4056-1.STL

Bati-1.STL

Battery PLUS tray-1.STL

Button_Voltage-1.STL

Button_Voltage_Pin-1.STL

Component_Subplate-1.STL

Cover-1.STL

Fixing PCBs-1.STL

Spring-1.STL

Assembly instruction:

----- Preparation -----

• Solder the 4 wires to the 2 switches then pass the switches through "Component_Subplate.stl"

• Clip the digital display Voltmeter on "Component_Subplate.stl" having passed the 2 wires of the voltmeter through the rectangular hole.

• Make the remaining soldering by following the electrical diagram to connect the components.

  ----- Battery compartment -----

• Strip 2 wires then wrap them through the 2 slots of "Battery PLUS tray.stl" & "Spring.stl"

• solder the wire on itself to maintain the loop.

  ----- Final assembly -----

See photo guide (Slides 1 to 6) and Photo "wiring diagram".

Material: PLA or whatever

Nozzle temperature: 205°C

Plateau temperature: 60°C

Material: PLA 1.75mm

Layer height: 0.2mm (scraficial layer of 0.2mm)

Filling: 20%.

Support:

/!\ Printing without support for "Bati.stl" and "Cover.stl" (supports are integrated).

Parts requiring supports : "Spring.stl" , "Fixing PCBs.stl"

Printing speed: 60mm/s

Printed on an Ender 3 V2