It is cool and it reminds me of tasty Newzealand honey ..
Step 1: Parts and Plan ... you allways need a plan ...
Several years later;
I went to the cellar and had a look at my tools ...
- one old transformer 220V to 12V
- one old vent from a defect atx power supply
- one very old electroly capacitor 470uF/16V
- one NEW! triac type TIC106
- one very old variable resistor from a portable radio with a power switch included 5 k Ohm
- one knob
- one diode 1N4007
- two NEW resistors, i don't remeber the values ... ?!
- one power cord (taken from the old radio ...)
- two nails
- some insulated wires
- some insulating tape
- one empty Newzealand honey plastic can
Then i went to the working room and checked the tools;
- one soldering iron
- some tin-solder
- some snippers
- a box cutter
- a drill (to drill holes ...)
- some screedrivers (to mount the knob)
- a combination wrench (to mount the potentiometer)
The result should be a cooling vent with a nice look and a seamless changeable airflow.
The vent runs with dc current. The tic and the capacitor will do the job. The tic is controlled by the dc halfwave created by the diode and regulated by the potentiometer.
Well, the values of the rasistors depend on the othe components. I experimented with the values to find a constellation where the potentiometer has a full range from nearly zero aurflow to full speed.
Just be careful not to R1 lower than 500 Ohm.