The article talks about a basic infrared controlled fan regulator or dimmer circuit applying normal parts for example a 4017 IC and a 555 IC.
Talking about the demonstrated remote controlled fan dimmer circuit, three main phases might be observed incorporated: the infrared signal sensor stage making use of the IC TSOP1738, the Johnson's decade counter, sequencer making use of the IC 4017 and a PWM processor stage using the IC 555.
Infrared Remote controlled Fan Regulator Dimmer circuit
The different procedures engaged within the circuit may be recognized with the aid of the following points:
When an infrared beam is targeted at the sensor, the sensor generates a low logic as a reaction to this which often brings about the PNP BC557 to perform.
The sensor employed here is a TSOP1738, it is possible to find out more about it within this simple IR remote control post
The conduction of the BC557 transistor as a reaction to the IR beam links the positive supply to pin14 of the IC 4017 that could be regarded as a clock pulse by the IC.
This clock pulse is translated into a single sequential hop of a high logic from the present pinout to the next succeeding pinout in the sequence across the demonstrated outputs of the IC 4017.
This sequential transfer or shift of a high logic pulse from one pinout to the next across the whole outputs from pin#3 to pin#10 and back is performed as a reaction to each and every temporary beam focused on the IR sensor by the IR remote handset.
You can actually observe that the IC 4017 outputs possess a couple of accurately determined resistors whose outer free ends are shorted and linked to ground via a 1K resistor.
The above configuration forms a resistive potential divider which produces a sequential incrementing or dropping potential levels at the node "A" due to the shifting of the high logics across the outputs as mentioned in the above justification.
This different potential is shut down at the base of an NPN transistor whose emitter may be seen linked to pin#5 of IC 555 that could be set up as a high frequency astable.
The 555 phase essentially features similar to a PWM generator which differs proportionately as its pin#5 potential is varied. The different PWMs are made at its pin#3.
By default pin#5 is associated with a 1K resistor to ground which helps to ensure that when you have no voltage or minimum voltage at pin#5 leads to an exceptionally narrow PWMs at its pin#3 and as the potential or voltage at its pin#5 is enhanced the PWMs also acquire width correspondingly. The width is maximum when the potential at pin#5 reaches 2/3rd of the Vcc of its pin#4/8.
Nowadays it seems that, as the outputs from the IC 4017 shifts producing a different voltage at the base of the NPN, a related amount of different voltage is shifted over pin#5 of the IC 555 which often is converted into an appropriately changing PWMs across pin#3 of the IC.
Since the pin#3 of the IC is linked to the gate of a triac, the conduction of the triac is correspondingly affected from high to low and vice versa as a reaction to the transforming PWMs over its gate.
This really is efficiently transformed into a preferred speed control or a suitable regulation of the linked fan across the triac's MT1 along with the AC mains input.
Hence the speed of the fan turns into adjustable from fast to slow and vice versa as a reaction to the infrared IR beams toggled on the connected IR sensor of the circuit.
How you can Install the circuit.
It might be taken care of the support of the following measures:
At first maintain the emitter of the BC547 transistor turned off with pin#5 of the IC555.
Now the two stages (IC 4017 and IC 555) may be believed to be isolated from each other.
First check the IC 555 stage in the following manner:
Disconnecting the 1K resistor across pin#5 and ground ought to increase the speed of the fan to maximum, and also connecting it back should reduce it to minimum.
The above will reveal the proper functioning of the IC 555 PWM stage. The 50k preset setting is not essential and might be set to around center of the preset range.
Subsequent, we have to verify whether the IC 4017 output node at "A" produces a varying voltage from 1V to 10V as a reaction to each pressing of the IR remote beam over the circuit's IR sensor.
If the above problem is satisfied, we are able to believe the stage to be working properly, and now the emitter of the BC547 may be integrated with pin#5 of the IC555 for the final testing of the fan speed regulation using a IR remote handset.
The remote handset could possibly be any TV remote control which we usually use in our homes.
If the above design will not function easily with a attached fan, it might have to undergo a small changes for enhancing the outcomes as demonstrated below:
The circuit requires the help of a MOC3031 triac driver stage for enforcing an inconvenience free and clean fan control by means of the remote handset.
WARNING: THE WHOLE CIRCUIT IS DIRECTLY LINKED WITH THE MAINS AC, OBSERVE EXTREME CAUTION WHILE TESTING THE CIRCUIT IN POWERED POSITION
Talking about the demonstrated remote controlled fan dimmer circuit, three main phases might be observed incorporated: the infrared signal sensor stage making use of the IC TSOP1738, the Johnson's decade counter, sequencer making use of the IC 4017 and a PWM processor stage using the IC 555.
Infrared Remote controlled Fan Regulator Dimmer circuit
The different procedures engaged within the circuit may be recognized with the aid of the following points:
When an infrared beam is targeted at the sensor, the sensor generates a low logic as a reaction to this which often brings about the PNP BC557 to perform.
The sensor employed here is a TSOP1738, it is possible to find out more about it within this simple IR remote control post
The conduction of the BC557 transistor as a reaction to the IR beam links the positive supply to pin14 of the IC 4017 that could be regarded as a clock pulse by the IC.
This clock pulse is translated into a single sequential hop of a high logic from the present pinout to the next succeeding pinout in the sequence across the demonstrated outputs of the IC 4017.
This sequential transfer or shift of a high logic pulse from one pinout to the next across the whole outputs from pin#3 to pin#10 and back is performed as a reaction to each and every temporary beam focused on the IR sensor by the IR remote handset.
You can actually observe that the IC 4017 outputs possess a couple of accurately determined resistors whose outer free ends are shorted and linked to ground via a 1K resistor.
The above configuration forms a resistive potential divider which produces a sequential incrementing or dropping potential levels at the node "A" due to the shifting of the high logics across the outputs as mentioned in the above justification.
This different potential is shut down at the base of an NPN transistor whose emitter may be seen linked to pin#5 of IC 555 that could be set up as a high frequency astable.
The 555 phase essentially features similar to a PWM generator which differs proportionately as its pin#5 potential is varied. The different PWMs are made at its pin#3.
By default pin#5 is associated with a 1K resistor to ground which helps to ensure that when you have no voltage or minimum voltage at pin#5 leads to an exceptionally narrow PWMs at its pin#3 and as the potential or voltage at its pin#5 is enhanced the PWMs also acquire width correspondingly. The width is maximum when the potential at pin#5 reaches 2/3rd of the Vcc of its pin#4/8.
Nowadays it seems that, as the outputs from the IC 4017 shifts producing a different voltage at the base of the NPN, a related amount of different voltage is shifted over pin#5 of the IC 555 which often is converted into an appropriately changing PWMs across pin#3 of the IC.
Since the pin#3 of the IC is linked to the gate of a triac, the conduction of the triac is correspondingly affected from high to low and vice versa as a reaction to the transforming PWMs over its gate.
This really is efficiently transformed into a preferred speed control or a suitable regulation of the linked fan across the triac's MT1 along with the AC mains input.
Hence the speed of the fan turns into adjustable from fast to slow and vice versa as a reaction to the infrared IR beams toggled on the connected IR sensor of the circuit.
How you can Install the circuit.
It might be taken care of the support of the following measures:
At first maintain the emitter of the BC547 transistor turned off with pin#5 of the IC555.
Now the two stages (IC 4017 and IC 555) may be believed to be isolated from each other.
First check the IC 555 stage in the following manner:
Disconnecting the 1K resistor across pin#5 and ground ought to increase the speed of the fan to maximum, and also connecting it back should reduce it to minimum.
The above will reveal the proper functioning of the IC 555 PWM stage. The 50k preset setting is not essential and might be set to around center of the preset range.
Subsequent, we have to verify whether the IC 4017 output node at "A" produces a varying voltage from 1V to 10V as a reaction to each pressing of the IR remote beam over the circuit's IR sensor.
If the above problem is satisfied, we are able to believe the stage to be working properly, and now the emitter of the BC547 may be integrated with pin#5 of the IC555 for the final testing of the fan speed regulation using a IR remote handset.
The remote handset could possibly be any TV remote control which we usually use in our homes.
If the above design will not function easily with a attached fan, it might have to undergo a small changes for enhancing the outcomes as demonstrated below:
The circuit requires the help of a MOC3031 triac driver stage for enforcing an inconvenience free and clean fan control by means of the remote handset.
WARNING: THE WHOLE CIRCUIT IS DIRECTLY LINKED WITH THE MAINS AC, OBSERVE EXTREME CAUTION WHILE TESTING THE CIRCUIT IN POWERED POSITION
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