Using this circuit, you can change the speed of the
fan from your couch or bed. Infrared receiver module TSOP1738 is used to
receive the infrared signal transmitted by remote control. The circuit
is powered by regulated 9V. The AC mains is stepped down by transformer
X1 to deliver a secondary output of 12V-0-12V. The transformer output is
rectified by full-wave rectifier comprising diodes D1 and D2, filtered
by capacitor C9 and regulated by 7809 regulator to provide 9V regulated
output. Any button on the remote can be used for controlling the speed
of the fan. Pulses from the IR receiver module are applied as a trigger
signal to timer NE555 (IC1) via LED1 and resistor R4.
Circuit Diagram :
Remote-Controlled Fan Regulator Circuit Diagram
IC1
is wired as a monostable multivibrator to delay the clock given to
decade counter-cum-driver IC CD4017 (IC2).Out of the ten outputs of
decade counter IC2 (Q0 through Q9), only five (Q0 through Q4) are used
to control the fan. Q5 output is not used, while Q6 output is used to
reset the counter. Another NE555 timer (IC3) is also wired as a
monostable multivibrator. Combination of one of the resistors R5 through
R9 and capacitor C5 controls the pulse width. The output from IC
CD4017 (IC2) is applied to resistors R5 through R9. If Q0 is high
capacitor C5 is charged through resistor R5, if Q1 is high capacitor C5
is charged through resistor R6, and so on.
Optocoupler
MCT2E (IC5) is wired as a zero-crossing detector that supplies trigger
pulses to monostable multivibrator IC3 during zero crossing.
Opto-isolator MOC3021 (IC4) drives triac BT136. Resistor R13 (47-ohm)
and capacitor C7 (0.01µF) combination is used as snubber network for
triac1 (BT136). As the width of the pulse decreases, firing angle of the
triac increases and speed of the fan also increases. Thus the speed of
the fan increases when we press any button on the remote control.
Assemble the circuit on a general-purpose PCB and house it in a small
case such that the infrared sensor can easily receive the signal from
the remote transmitter.
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