Dr C. H. VITHALANI sing this kind of circuit, you can change the speed of the lover from your lounger or understructure. Infrared device module TSOP1738 is used to receive the infrared signal transmitted by handy remote control. The signal is powered by regulated 9V. The AC droits is walked down by simply transformer X1 to deliver another output of 12V-0-12V. The transformer outcome is fixed by full-wave rectifier composed of diodes D1 and D2, filtered by capacitor C9 and governed by 7809 regulator to supply 9V regulated output. Virtually any button within the remote works extremely well for controlling the speed from the fan. Pulses from the IR receiver module are used as a trigger signal to timer NE555 (IC1) by means of LED1 and resis-


tor R4. IC1 is wired as a monostable multivibrator to postpone the clock provided to decade counter-cum-driver IC CD4017 (IC2). From the ten results of 10 years counter IC2 (Q0 through Q9), just five (Q0 through Q4) are used to control the lover. Q5 outcome is not used, whilst Q6 end result is used to reset the counter. One more NE555 timer (IC3) is usually wired being a monostable multivibrator. Combination of one of many resistors R5 through R9 and capacitor C5 handles the pulse width. The output from IC CD4017 (IC2) is applied to resistors R5 through R9. If Q0 is large capacitor HANDSET is recharged through resistor R5, if Q1 is usually 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) hard drives triac BT136. Resistor R13 (47ohm) and capacitor C7 (0. 01ВµF) combination is utilized as snubber network for triac1 (BT136). As the width from the pulse decreases, firing perspective of the triac increases and speed from the fan as well increases. Hence the speed in the fan improves when we press any press button on the remote device. Assemble the circuit on a generalpurpose PCB and house it in...


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