Bladeless Fan with Adjustable Airflow

thingiverse

UPDATE 5/30/18: The original circuit allowed voltage adjustment from 0-12V. However, the fan would shut off at around 9V or less, leaving only a small portion of the potentiometer's adjustment range usable. To resolve this issue, I included a second schematic that utilizes a Zener diode, expanding the voltage range to 9-12V. Are you looking for even more powerful airflow? Consider using an 18V or 24V supply to boost maximum air circulation (just be cautious not to exceed these limits, as it could damage or shorten the fan's lifespan). This remix of Thing 2170098 features a bladeless fan upgraded with a power switch and adjustable airflow knob. I customized the fan casing to accommodate the following components: Power Jack: DIGIKEY P/N 839-1291-ND (CONN PWR JACK 2.1X5.5MM) Fan: DIGIKEY P/N 1570-1083-ND (FAN AXIAL 40X20MM 12VDC) Potentiometer: DIGIKEY P/N 987-1738-ND (POT 500 OHM 1/10W) Switch: DIGIKEY P/N EG2463-ND (SWITCH TOGGLE SPDT 0.4VA 20V) Power Supply: DIGIKEY P/N 993-1232-ND (AC/DC WALL MOUNT ADAPTER 12V 3W) Refer to the attached schematic/diagram for detailed wiring instructions. For additional STL files necessary to complete the fan, please consult the original Thing. ASSEMBLY NOTES: If you encounter difficulties getting the inner case into the outer case, try placing the inner case in a freezer for a short period to shrink it slightly. This should allow it to snap into place easily afterward! To provide extra stability and prevent the fan from tipping over, use M10 (metric) or 3/8 (imperial) nuts on the bottom of the pedestal. I opted to use small machine screws instead of self-tapping screws for attaching the outer case to the fan casing. This worked perfectly fine. Yellow poster putty was used as gasket material around the fan and between the fan casing and outer case. You may notice some of this material at the seams in the images. For securing the toggle switch, I recommend applying a small amount of super glue or epoxy for added stability. GENERAL NOTES: The 500Ω potentiometer I utilized works well as a voltage divider (not a rheostat). Higher resistance options would also be suitable, provided the supply can deliver sufficient current. While higher resistance will enhance maximum output voltage, this improvement is relatively minor. The total cost of purchasing all parts from Digikey is approximately $20; with spare electronics on hand, you can significantly reduce costs.