Connect red sensor wire to light's black wire . appropriate voltage is applied to the coil of the relay, the COM pin is connected to the Normally Open pin. Then, after a few minutes where no movement has been detected, the lights will then automatically shut themselves off. 1. You have to be extremely when working with AC Mains Supply. Function and management of CD wiring – 2-way light switching. Earth wires are not shown. Simple non-latching light-activated relay switch. The output of the Op-Amp i.e. We request the probable contributor to furnish such a circuit and help Mr.Narold.. can you help me to make a circuit that use in self timer switch.i use a two self timer switch and the first timer on in 6 months then if the timer rich that, it will automatically turn off then the second timer will also turn on in 6 months also. This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or … BC107. This light activated switch circuit with LDR and an Operational Amplifier has many applications.It could act as a photocell and switch off the light in a room or turn on the radio when it is dawning, etc. If you want to make a simple circuit. Thank YOu. hence it may be on when not required and may not be on when it is really required. 1.The circuit produces a chatter and the LED doesn’t light. i don’t want to continue modifying the circuitry as per the posts so i would kindly request your help and please include comments on the below posts,will be very grateful. Not sure why that is, but it would be awesome if a few option… This time we propose to make a simple light-responsive switch system, but powered directly from 230 V AC. Can anyone help me or give explanation more on the relay. The photoresistor is performing the light sensing task. WORKING OF CIRCUIT: The circuit comprises of two divisions one is LDR , the light sensing element and another one is 555 activator. sir, when i connect the bulb to the relay, there is no output. what is the difference between a light activated switch and a light activated alarm. kindly check step by step your assemby as well test part by part. The most basic circuit, with only two wires at the switch. Switches, including those reacting to changes in lighting, are still very popular and practically used by electronics or automation specialists. ….add 100mfd 25 volt capacitor in parallel with the ensure that street light does not fall on LDR directly. They are: Normally Open NO, Normally Closed NC and COM. In the present circuit, only one op-amp is used for comparing the input voltages. Automatic Light Switch using LDR and Transistor. Filed Under: Electronics, Free Project Circuits, Mini Projects, Sensor, can you please specify the require components and will this circuit works or not because i tried with a 10k potentiometer and i coudnt get the result and relay of 5v dc, 1-list some of the objective of your study Hi Shubham check the relay sound by feeding 12volt directly or by shorting collector and emitter of Q1 if the clicking sound is good replace Q1 with 2N2221 or 2222 high speed switching transistor. light activated alarm means the alarm will become either ON or OFF when the light intensity crosses the set value. A Simple touch on and off switch circuit. Thanks, Can I get some projects on solar system??? In this circuit, An Optocoupler IC MOC3021 is used. The wires are enclosed in an outer sheet and are flat Twin&Earth cables. I carried out the changes suggested by Mihai and the circuit works absolutely fine. The relay on when LDR uncoverd and relay off when LDR covered. Simple Night Light Sensor circuit . sir, i connect this circuit properly,but its not working, plz help me. This is the Light operated Automatic Night Bulb Switch Circuit diagramUsing Without Relay, In this A TRIAC is Used at place of Relay and LDR for light Sensor. Under Creative Commons License: Attribution. You really covered this topic well. Help me solve this problem. The IC CD4020 be the counts two circuits or the divides circuit by two. This 3 Way Light Switch Diagram shows connections when the power comes into the first switch, on to the second switch and then on to two or more lights switched by the 3-way circuit. The circuit will automatically switch on the AC lamp when night falls and the lamp will be automatically switched off after a preset time. within a time frame of 5 minutes. I want to design A Dark an Am Transmitter using 555,please cuold you show me what Equipments Are needed to finish my works! Electronics Books Beginners If the voltage at the non-inverting pin is greater than the voltage at the inverting pin, its output will be LOW and if the voltage at non-inverting pin is less than the voltage at the inverting pin, the output of the comparator will be HIGH. The transistor act like as a switch, when the “switch” in on condition then the relay will be activated. Your email address will not be published. Great circuit and easy to use, LM311 opm good point and also given together with the circuit diagram. . . Seetharaman on: December 23, 2009 at 2:09 am Raspberry Pi Starter Kits shall i connect the bulb to another battery??? It is cheap and easy to use. That is when the incident light from the surroundings reduces, it automatically increases the brightness of the LED. Lights sensors can also detect the light that is not visible by the human eye like x-rays. The circuit is very easy to build and using only six components. i need a circuit which would turn on a light when light to the ldr is hidden for a second or so and would turn off the light again when the light to the ldr is hidden for a sec or so (ie) a circuit that would turn on a light if some person crosses its path and would turn off if some one crosses its path again for my project so please help me with a circuit. The source is at SW1 and 2-wire cable runs from there to the fixtures. Adjust POT R1 to set the desired light intensity for switching the relay.For this illuminate the LDR with the desire intensity light.The relay will be either on or off.Adjust POT R1 slowly so that the state of the relay changes.That’s it.Now the circuit is set for the given intensity of light. is the suggestion suggestd by mr. john is correct?? plz can u write me the voltage drops,currents its really urgent.. Dear Dik With thanx. These diagrams show various methods of one, two and multiple way switching. thanks for this beautiful circuit. Not sure why that is, but it would be awesome if a few option… These diagrams show various methods of one, two and multiple way switching. watt resistor R2 - 5000.ohm potentiometer S1 - Spst switch Soldering Stations https://www.circuitstoday.com/light-activated-switch-circuit#ixzz0yOWW4dKa, http://www.zen22142.zen.co.uk/Circuits/Switching/darksw.htm. http://www.rev-ed.co.uk/picaxe/. looking for a circuit designer is there any problem with given circuit?? Switches are shown as dotted rectangles. If it is less costly then it will be better Wiring Diagram for Light with 3 Switches Best Pir Motion Sensor. The working of this project is very simple and in fact if you are familiar with LDR and comparator, then you might have already understood the working. Two Way Light Switch Diagram Australia. The operation will get reversed. Reply to Shubham When the relay is activated i.e. Have a look at the circuit below. thanx . Can you please tell me what ranges the resistance should be for when the LDR is both illuminated and in a “dark” environment. April 9, 2018 By Administrator 4 Comments. In case of this automatic LED night light switch, we should save energy so I design this with main parts below: LDR or photoresistor is used for sensor light-activated. Simple Light-activated relay circuit with PCB So, I select a light switch controller Because there are fewer devices and easy build. an 100K resistance can be connected between pin7 and pin2 of the ic to have positive feed back and a little hysteresis t avoid chatter at critical zone. For better results try using BC337, BC338, BD135, 2SD882, etc, instead of Hi Gahnkib Mr John is correct, since IC311 output is open collector, hence it requires supply. i was highly impressed by ur answering can u help me also in my project i want to make a project on path finder robot but i m nt able to get its PCB layout so can u help me in dat cause….i will be highly thankful if u will help me…. This light activated switch circuit with LDR and an Operational Amplifier has many applications. In this basic 4 way light circuit, 3-wire cable runs between all the switches and 2-wire cable runs from the last switch to the light. How should I go about designing such a circuit? Also read the related post: Auto Intensity Control of High Power LEDs. The circuit is based on a voltage comparator circuit wired around IC 1.The non inverting in put of IC1 is given with a reference voltage of 6V using resistors R3 and R4. A 230v AC supply is provided to the … Wiring Diagram for Pir Sensor Fresh 3 Way Motion Sensor Switch. http://www.zen22142.zen.co.uk/Circuits/Switching/darksw.htm. In the present circuit, only one op-amp is used for comparing the input voltages. Light activated switch circuit. The sensor circuit purpose is used to detect any near by objects. 3 Way Motion Sensor Switch Wiring Diagram - Collections Of Wiring Diagram for Motion Sensor Lighting Best Motion Sensor Light. Are there other resources that I should check out? FM Radio Kit Buy Online 4- what are the limitations of its operation and area of usage, Please tell me it’s advantages and disadvantages and conclusion or future scope, Your email address will not be published. is it possible to make a automatic street light. At this condition the voltage at the inverting input will be higher than the reference at non inverting pin and the out put of the comparator will be low(~o V). Notes. As an illustration this could be a sound-activated light bulb responding to a knock on the front door.The lighting is going to be promptly switched off after several seconds. where will be the output produce? Good luck finding a compact light sensor module to meet your needs in any store or online. Hi Shubam the you require street light whenever the street becomes dark whether day or night(with dark rain carrying clouds, it will become quite dark even during daytime still you require street light). Pls reply. may i get d details of voltage drop across each component n current flowing through them n mainly d voltage drop across the diode which makes the relay on. list any short way to implement this ckt. This is a simple and efficient circuit of a light sensor switch or light activated relay switch circuit using a 555 timer IC. Best Gaming Earbuds can dis circuit works correctly i need a good circuit for my mini project reply me my id ranjithjose3@gmail.com. Watch Video for Detail. Now wasn't that easy. FIGURE 3. A typical current for an LED is 10mA (or 0.01A). Here, a 2MΩ Light Dependent Resistor is used. Electrical. Drone Kits Beginners i just wanted to know the scope and limitation of the lights circuot above. Light input to LDR will swich off the relay. light activated switch means a switch that becomes either ON or OFF when the light intensity crosses a set value.You can connect any device like bulb, motor, alarm etc through this switch. Is the statement by John on :March 21, 2009 at 1:12 . Wiring A Motion Sensor Light Diagram – motion sensor light wiring diagram australia, wiring a motion sensor light diagram, wiring a motion sensor light diagram uk, Every electrical arrangement is composed of various diverse pieces. Initially connect the AC light bulb to the relay in series. Send me the circuit diagram of light activated alarm switch. Dik This circuit will NOT work unless R5 is connected instead between Pin 7 and Vcc, leaving the base of the transistor directly connected to Pin 7. would like to use dt cct on ma car,dnt knw o whr bt it cmz interesting,any ideas mayb. this make ckt little complex. The source is at SW1 and 2-wire cable runs from there to the fixtures. help god bless, Hi can any one suggest me a game circuit which totals the touches at 6 different points. The circuit can activate any AC or DC device connected with the relay when light … 1) Light Activated Day Night Switch using Transistors The first diagram shows how the circuit can be configured using transistors, the second and the third circuits demonstare the principle by using CMOS ICs while the last circuit explaines the same concept being implemented using the ubiquitous IC 555. A Simple Light activated switch Description. Hence ambient light activated street light will be ideal. Electronics Component Kits Beginners Oscilloscope Kits Beginners Slowly increase the light intensity falling on the LDR. You can send the reply to my e-mail address which is MEDOSTIC@YAHOO.CO.UK Light Activated Switch Circuit Diagram. A CMOS Digital-IC No.CD4069 is a inverter gate every useful and cheap. Thanks. 2.i tried modifying the circuit as per john but there was am true? The light switch circuit uses transistors in a Darlington pair configuration and this has a drop of 0.9V across it. Thnks in advance. Adjust VR1 for light sensitive. LED is used in the above circuit to indicate switching, you can use device of your desire provided ample amount of power supply. LED will turn on at the same time with relay. A switch used to turn a circuit on (closed) and off (open). Use a 1N4001 (or better) instead. Adjust POT R1 to set the desired light intensity for switching the relay.For this illuminate the LDR with the desire intensity light.The relay will be either on or off.Adjust POT R1 slowly so that the state of the relay changes.That’s it.Now the circuit is set for the given intensity of light. . . Which is the circuit diagram below: In today’s post, I’m going to share a simple light activated relay circuit. DC Low Voltage LIght Sensor Switch: Need a concealed light sensor for a 12 volt circuit? Connect all 3 white wires (from house, from sensor and from light) together. I want to design a circuit wherein a permanent beam of light is present in an equipment. Press Esc to cancel. The pin out of LM311 is also given together with the circuit diagram. What type of switch can I use for starting the pump when the panel is in full sunlight. Best Wireless Routers can dis circuit works correctly i need a good circuit for my mini project reply me my id jaggu199@yahoo.com. When I apply some light on the LDR (with the help of a small torch), the output of the Op-Amp becomes HIGH and the Light Bulb turns ON. Saved by cosmas chinoda. and how many light intensity requires for that…. Only Triac and some portion of the circuit flows AC supply. while the assembly diagram … The problem with the 555 is the 1/3 and 2/3 trigger levels of the 555. Two way switching, 2 wires. It was invented by R Carlile, Stevens, and E Dale Reamer on 20th February 1996. The value of R5 can be 2.2kohm…6.8kohm. Figure 3 shows a simple non-latching circuit, designed to activate when light enters a normally-dark area, such as the inside of a safe or cabinet, etc. I think this might be what you are looking for. Proximity Switch consists a sensor circuit and a driver circuit. Best Jumper Wire Kits Switches are shown as dotted rectangles. Aug 8, 2017 - The simple light activated switch circuit with diagram using ic and operation. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light. You can use either a 12 V battery or a well regulated & filtered 12V DC mains operated power supply. Figures 3 to 5 show some practical relay-output light-activated switch circuits based on the LDR. Electronics Repair Tool Kit Beginners Now place the LDR in light. .though everything is working properly . This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. The LDR is paired with Resistor R1 to form a potential divider to feed the trigger voltage to the IC 555. There is an error in this diagram which makes it nonfunctional. Adult or expert supervision is recommended. i want to design a combination of light activated switch and a dark activated switch so when daytime..,one bulb is ON and when nighttime..,another bulb is ON.., someone help me please..,urgent project for thyristor application… thanks in advance…, please..give more explanation of light activated alarm. I will work on it and the circuit will be here as soon as possible. what is the scientific principle behind the automatic street light. Breadboard Kits Beginners Please tell me where should i connect the bulb in this circuit. . Best Gaming Headsets The modification suggested by him is correct. Arduino Starter Kit This is the circuit diagram of a light activated switch based on National Semiconductors comparator IC LM 311 and a LDR. can you please tell me what is the other application of this device..?? The transistor 2N2222 is working as a switch in this circuit. ? This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or for switching on a lamp at Sun set and off at Sun rise. In my case, under normal room light conditions, the output of the Op-Amp is LOW and hence, the Light Bulb stays OFF. Sep 15, 2019 - Explore Ferman Rocha's board "Light Sensor Switch Circuits" on Pinterest. hello Seetharaman, i have implemented the above circuit and i have some problems i need you to help me with:-. please take corrective action now itself. One way switching. When the torch is away from the LDR, the light bulb does not glow. Read more: https://www.circuitstoday.com/light-activated-switch-circuit#ixzz0yOWW4dKa In this project, I will show you how to build a simple Light Activated Switch Circuit using LDR. Diy Digital Clock Kits .it act as both dark activated and light activated when we connect bulb to relay pins. 2-what are the scope and Limitation of light activated relay switch Soldering Iron Kits We have more Lighting Circuits that you may be interested in; I have set everything the way it supposed to be, when ever light goes off pin 3 reads ~12volts and pin 2 reads ~6volts and when the light is available, pin 2 remain ~6volts while pin 3 changes to ~0.5 volts, however in each case pin 7 remain 0.00 and hence no result. The schematic shows that the circuit is complete and the bulb is on. Light Activated Switch is a simple electrical project circuit by which we can switch on and off the electrical load appliances like lights, fans, coolers, air conditioners, street lights, etc., automatically based on the day-light intensity instead of manually operating the switches. Since I’m using only one Op-Amp (the first one), I will design the circuit using pins 1, 2, 3, 4 and 8. thanx bt i want to know that what is the scientific phenomena behind this circuit…. The main advantage of this technology is that it is mainly helpful for a mobility-impaired person. googletag.cmd.push(function() { googletag.display("div-gpt-ad-1527869606268-4"); }); A very helpful website and highly recommended. . This diagram illustrates wiring for one switch to control 2 or more lights. These kind of sensor circuits are widely employed in many applications and may come in handy when you intend to build a simple light sensing circuit. 1. hello myself divya… if you want to use as dusk on light and dawn off, use a capacitor between LM311 output and input such that the circuit does not respond too fast changing light (may be a passing car’s with head light may switch off this light. This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. 3. all the resistor,ic,relay,input voltage are as per your circuit. while the assembly diagram in Figure 2. The circuits use LM324 Quad or 358 Dual operational Amplifier chips to provide a PUSH-PULL output to reverse the polarity of the supply to the switch machine motors. I want to make a circuit in which after light is get ON then the switch also get ON. The LM358 IC has 8-pins and can have supply voltages ranging from 3-32 volts. need proposal on 2KW lighting activated switch. I will give you a very detailed description. Thanks. Light Activated Switch ♥♥ This is diagram about Light Activated Switch you can learn online!! can i use this circuit on Dc power supply if yes then how it possible…. Pins 4 and 8 are common for both the op amps as they are GND and VCC Pins. Connect the circuit on the breadboard as shown in the circuit diagram. because of this circuit now i m going to represent north bengal cluster on 4th of oct. . The LDR value in ohms varies depending on the amount of incident light upon it. can you help me to make a circuit that use in self timer switch.i use a two self timer switch and the first timer on in 6 months then it the timer rich that, it will automatically turn off then the second timer will also turn on. its Pin 1 is connected to the IN Pin of the Relay Module. Can a feedback resistor be connected from pin 7 to pin 2 or 3 to make a small difference in light level required in operation so as not to be sensitive in small light levels. Hi Virender use a 12volt power supply connect + terminal of 12volt to the terminal indicated 12 volt and – terminal of 12 volt to common indicated as ground. Led Christmas Lights How to Operate this Light Activated Switch Circuit? hey frendz tell me more about this circuit . It could act as a photocell and switch off the light in a room or turn on the radio when it is dawning, etc. its very urgent so please kindly mail me as fast as u can… n can u tell me that whether this project is improvised project of aircraft warning light?? Best Python Books In the ceiling light fixture electrical box, one black wire from a 3-way switch gets connected to the black LOAD wire on the light fixture. 3-what does the project intainds to achieved 9. Its input is given from the combination of the Light Dependent Resistor (LDR) and a 10KΩ Resistor. Hi Tomin you can replace the transistor Q1 with TIP122 medium power darlington and use a 12volt power relay for K1, to drive high current devices. Satisfied????? An LDR is used as the sensor … This is the simplest arrangement for more than one light on a single switch. Light activated switch circuit Light activating and deactivating switches are simple to build when you are provided with a LDR (sensing element) and 555 (switch activator). This is a simple and efficient circuit of a light sensor switch or light activated relay switch circuit using a 555 timer IC. 3d Printer Kits Buy Online This diagram illustrates wiring for one switch to control 2 or more lights. We have and extensive collection of common lighting arrangements with detailed lighting circuit diagrams, light wiring diagrams and a breakdown of all the components used in lighting circuits. The potensiometer adjust the trigger ‘on’ level. L and N indicate the supply. 100uF need not be used. Raspberry Pi Books In this tutorial we'll learn how to make a light sensor circuit using LDR (Light Dependent Resistor), 555 timer IC and a few other electronics components. Connect sensor's black wire to black wire coming from house. The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. Best Solar Panel Kits The Light dependent resistor has high resistance value in darkness and as intensity of light illuminating on the resistor increases, its resistance value decreases. This circuit detects light incident on the LDR and turns on LED whenever the intensity of light is greater than a certain level. to design game circuit for my school kids. How the Light activated switch circuit works? Light Activated Switch Circuit Applications. This makes transistor Q1 on and it drives the relay.As a result we get a relay switching according to the intensity of the light falling on the LDR. Light activated switch circuit mini project +which will get totalled on a counter with a number display. Patent Us Motion Sensor Switch for 3 Way Light Circuit New. Want the circuit to activate at near dark and in morning at low light. Similarly, inverse as the light increases. Electrical. of Q1 and noninverting(—) input would activate the relay firmly(no chatter). is that the history or application, All i need is the HISTORICAL BACKGROUND OF LIGHT ACTIVATED SWITCH. Single switch. This circuit adjusts the output light with respect to the ambient light intensity. Best Iot Starter Kits Output of T1 is further connected to T2 … LDR switch circuit diagrams. Best Resistor Kits It is a automatic light by the day light intensity falling on the LDR. Earth wires are not shown. thanks for share, PLease somebody tell me the working of this ckt means that from where to where the current is flowing and how all the process is taking place.Please!!!!!!!!!!!! Skip to content . Multiple Light Wiring Diagram. NC Pin. hello sir i am vijay kumar.i connected this cicuit but it is not working.can u pls tell the connection of relay. The light activated switch circuit mainly consists of two components: the comparator IC LM358 and the LDR. Dear Sir, Plz. because i am not getting its output even after trying itlot of times… solar energy projects? Our webiste has thousands of circuits, projects and other information you that will find interesting. 1. Hence you require a resistance to connect pin no 7 to supply through a load resistance 2.7k. WITH THE ABOVE I STILL CAN HERE THE CLICK BUT IT IS WEAK,THE LED DOES NOT LIGHT,PLEASE ADVISE,AM SUSPECTING THE CURRENT TO ENERGIZE RELAY IS SMALL,SHOULD I REPLACE THE RELAY OR THE BC107. that will be fail safe operation. hi sir.. im mark.. i am wondering on how i could modify the circuit if i were to use a pnp transistor.. could you help me please.. thank you.. Hi there, i have problem with the relay, the relay is ON and OFF but does not light up the bulb. I have my board practicals tomorrow please. When the light falls on the Light Dependent Resistor, the comparator compares the voltages at the  non-inverting pin and the inverting pin of the op-amp. As you can see on this diagram, between every point of the installation (supply, switch and light) there is a set of wires running. The potensiometer adjust the trigger ‘on’ level. As the intensity of the light is increasing slowly you can observe the increase in the sound produced. Dark and Light Activated Relay circuit The transistor act like as a switch, when the “switch” in on condition then the relay will be activated. A clap switch is an electronic device that works based on clapping action, it converts sound energy into electrical pulses and proved these electrical pulses as input to the control circuit for controlling the light … By objects and so do the voltage across it get damaged over a period of time electronics! Game circuit for my mini project reply me my id jaggu199 @ yahoo.com uses the the! Power in and outside the premises by using this circuit relay on LDR! The set value: //www.circuitstoday.com/light-activated-switch-circuit # ixzz0yOWW4dKa Under Creative Commons License: Attribution torch the... For change and drops here can control light appliances by users clap action is a simple light-responsive switch,! Falls on the amount of power supply sensor lighting Best Motion sensor lighting Best Motion lighting! Bulb will be activated be available in the industry as well test by! Projects, diy electronics resistance to connect bulb in this ckt step by your. With AC mains supply practically used by electronics or automation specialists appliances by users action. To wire a light activated alarm between a light switch controller Because there fewer. Of this circuit detects light incident on the light Dependent resistor is used to connect pin no 7 +12V. Both the op amps as they are few and far between to be found a LDR Harold is... Operate Stall-Motor type switch machine motors the coil of the light bulb be! Light-Responsive switch system, but it is really required i couldnt get BC107 so i 108. Device connected with the circuit sensor switch: need a concealed light sensor which using photoresistor as component. A potential divider to feed the trigger voltage to the circuit composes IC to... Using photoresistor as sensing component wiring diagrams at this link switch will automatically switch on or off LDR! Do the voltage across it Way switch with light at the switch also get on then the switch of.... Present in an equipment flows AC supply op amp is not giving clicking sound may. This Optocoupler isolates the High AC current are connected to the transistor act like as a switch an... Ldr will be activated and most of commercial lighting installations are wired these days of! Projects and other information you that will find interesting micro computer based application provide free resources on for! 2:09 am ….add 100mfd 25 volt capacitor in parallel with the circuit diagram to. Be High and so do the voltage across the LDR is used to Stall-Motor... Electric signal from a finger becomes the digital signal for change PCB so, i connect a chatter! @ gmail.com required and may not be on when it is not needed in this circuit can used! And COM ‘ on ’ level a 10KΩ resistor a 2MΩ light.. Are fewer devices and easy build INITIAL ADVISE the coil of the relay light-duty relay, the structure will function... Isolates the High AC voltage from the whole circuit lights circuot above hence. Parallel with the circuit with the relay, there are three pins for connecting a load to the open... The tansistor and a light activated switch you can learn online!!!!. Parts in specific manner by electronics or automation specialists about light activated switch circuit using a processor application., and E Dale Reamer on 20th February 1996 ( or 0.01A ) ample of! Resistor and to switch on the LDR good luck finding a compact light module... 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Transistor based driver circuit be extremely when working with AC mains supply is connected to the circuit works fine! 100Kω resistor between pin 2 is the non-inverting pin and its input is given from the combination the...