Here is the circuit of clap-operated remote control fans is used to control not only switching properties but also control speed of fan. The main advantage of clap operated remote control for fan is, it can control up to ten-step speeds of fan where normally a fan has three to five step speeds.

Circuit description clap operated remote control for fan

This entire circuit clap operated remote control for fan is divided into four major section i.e. sound-operated trigger pulse generator, clock pulse generator, clock pulse counter and load operator.

Sound-operated trigger pulse: - The heart of this section is transistor T₁ BC148, configured as class-C amplifier mode. The MIC₁ is used to change voice signal into its corresponding electrical signal and is given to base of transistor T₁ in order to amplify and increase its intensity.

Clock pulse generator:- This section is build around timer IC NE555 and configured as monostable multivibrator. The trigger pulse generated by transistor T₁ is given to pin 2 of IC₁ and time period (T) for output high is calculated by formula.

T = 1.1RC

Clock Pulse counter:- This section is build around decade counter CD4017BC which counts the clock pulse generated by timer IC (IC₁). The output from IC₁ is given to pin 14 of IC₂. IC₂ has ten outputs, viz, o, 1, 2, 3, 4…..9. Here we use only three outputs i.e. output 1, 2 and 3 from pin 2, 4, and 7 respectively. Output 4 from pin 10 is directly connected to reset pin 15.

Load operator:- This section is build around three transistor as relay driver to operate three separate relay. Output from each pin of IC₂ is given to base of each transistor through 100Ω and LED as shown in circuit diagram. Output is taken from collector of transistor and is connected to relay. The three LEDs used to indicate gear or speed i.e. LED₁, LED₂ & LED₃ indicates gear 1, gear 2 & gear 3 respectively.

NOTE:-This circuit used to operate in 1^st speed similarly, 2^nd clap for 2^nd speed, 3^rd clap for 3^rd speed and 4^th clap to switch off the fan.

PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R₁ = 10 KΩ

R₂ = 1.2 MΩ

R₃ = 2.2 KΩ

R₄ = 150 KΩ

R₅ = 220 KΩ

R₆ = 10 KΩ

R₇, R₈, R₉ = 100 Ω

Capacitors

C₁, C₂ = 0.1 µF/16V

C₃ = 4.7 µF/16V

C₄ = 0.01 µF (ceramic disc)

C₅ = 1000 µF/12V

Semiconductors

IC₁ = NE555 (Timer IC)

IC₂ = CD4017BE (decade counter)

T₁ = BC148

T₂, T₃, T₄ = BEL187

D₁, D₂ = 1N4001 silicon diode

Miscellaneous

MIC₁ = Condenser microphone 34LOD

LED₁ = Green

LED₂ = yellow

LED₃ = RED

6V-0V-6V, 500mA secondary transformer