This circuit is simplest electronic regulator that can use for fan, lamps or any other dimmable electric devices.
It is similar to commercial electronic fan regulators.
The triac don't need to heatsink because the ceiling fan consume low power(lower than 100W).
Parts list:
Triac BT136
Potentiometer 500k (with switch)
Diac DB3
Capacitor 0.1uF 400v(3pcs)
Resistor 10k
Resistor 15K
Resistor 100R
Coil 40uH
NOTE:
Don't touch the circuit when it connected to electric line