Both optocoupler and cd4017 i'm using for 1 project…. I made this circuit (BC557) to drive an automotive relay. can you please help me? An optocoupler (or an optoelectronic coupler) is basically an interface between two circuits which operate at (usually) different voltage levels. In those cases using 4N25 OPTOCOUPLER chip is ideal. As we have already learnt about transistors, an ideal transistor will not allow any current to pass through it if the base pin is not triggered. This allows the use of a voltage drive, which means that it is possible to have a less complex circuit with lower power consumption compared to a BJT. I need help with my circuit (optocoupler, transistor, relay) Need help hooking up an H11AA1 optocoupler to detect current in an AC circuit. The rest of the operations are self evident. See Part 1. The air gap slot of the optoisolator is blocked with a lever kind of attachment, which is also integrated to the window or the door. The above action illuminates the internal LED whose light is detected by the photo-transistor causing it to conduct across its relevant pin outs. Hello sir, I have modified the above circuit so please can you just have a look and tell me whether this circuit will work or not? The whole circuit can be powered from any DC source capable of delivering about 50 mA at 12V DC. 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I've been "cog"jugating some ideas in my head that use A/C motors so today I experimented with controlling an A/C device with a Propeller. sir. the opto LED resistor could be a 4k7…it's not too critical, Can i use an audio signal to trigger the optocoupler. As this is to be used in an automotive application, the signal trigger voltage and also the relay driving voltage comes from the same battery source. Notes. The working of both the circuits is simple, they are using only a few components. confirm the second point by disconnecting the opto LED cathode from the ground line. The optocoupler circuit we will build with a 4N35 chip is shown below. We use cookies to ensure that we give you the best experience on our website. how can i drive a 12v relay with pc817 opto coupler with 2n2222 to isolate 220AC voltage from PIC MCU? It provides isolation between control circuit and power switching and save the control circuit from high-voltage transient or surge voltage usually generated from Inductive load like Motor, relay etc. and what error the code given in the article has?? Required fields are marked *. Also the BC557 gets pretty hot within a few seconds. In this tutorial, we are going to make a circuit of Optocoupler Relay Driver. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. The output of the optocoupler is conditioned and the gate pulse needed to trigger the transistor is generated. that’s why we have used a 2N3904 NPN transistor at the output of this optocoupler. The Optocoupler is just a small-sized circuit of infrared receiver and sender but in case of making it with externally by using IR sender and receiver cause many problems. This circuit is more effective and easier to install than the conventional magnetic reed relay type intrusion alarm. The following post describes how to drive a relay by using an isolated method, or through an opto-coupler device. With a relay coil to absorb the diode protection. it looks OK, however the base resistor needs to be increased to at least 10K, and also for better response connect another 10K from the emitter of the opto transistor to the ground line. In this tutorial, we have made two types of circuits. 1. hope you will clarify this for all of us, Hi sir need your help, i want to make a module relay for arduino, i Using pc817 optocoupler to my module ,but i don't know value of resistor and a transistor? Working and Demonstration: Use this code as you would use any other BARUTI ,s works. from the junction of the base resistor and optocoupler pin, connect another 10k to ground, because it is always recommended to keep transistor base to its emitter level through a resistor, so that during an absence of signal, the base does not remain floating. Oct 31, 2019 - These simple optocoupler relay driver circuits can be used in variety of electronic projects. https://drive.google.com/file/d/0B7h83BRbOTR0N2NfUE1MWmtkb1k/view?usp=sharing. However keep an eye on the supply polarity. Arduino Relay Driver Shield Circuit Diagram: In this 3-Channel Relay Driver Circuit, we have used an optocoupler to trigger the NPN transistor which further drives the relay. Solving for n gives us 7,692 steps. Parts used – 1) Relay. Therefore, this optocoupler can resolve 7,692 steps from a PWM running at 2kHz. The key advantage of an optocoupler is the electrical isolation between the input and output circuits. Hi Ngoc, separating the ground can make the circuit very complex, instead you can try putting stabilizing agents across all the concerned parameters. When I connected a double coil relay with effective 100 ohms resistance, the relay did not turn on without the trigger, but when i connected the trigger signal wire then it turned on, but it does not turn back off even after removing the signal trigger wire. Your email address will not be published. doggiedoc Posts: 2,139. yes you can definitely use it…. And optocoupler will be triggered by the active LOW signal. Driver circuits consist of components required to turn on the TRIAC or transistors or thyristors in the output circuit. once again thank you sir.. Hello sir, Is mct2e different from pc817? Well, the answer is very simple both are switches. On the NPN circuit, a logic zero (0) to the optocoupler LED is required to turn on your Load. the C/E rating will depnd on the opto specs which will need to be checked from its datasheet. Hi Swagtam, I am making a relay driver for output 220VAC 10A. The optocoupler relay driver circuits are used in various electronic projects. Notice that for the PNP circuit, a logic 1 to the input of the optocoupler (LED on) turns on power to your Load. We know from our tutorials about Transformers that they can not only provide a step-down (or step-up) voltage, but they also provide electrical isolation between the higher voltage on the primary side and the lower voltage on the secondary side. Again this is non-inverting - HIGH in is HIGH out. The unveiled was all over the warlords and, as ever, was cleaning only find from Micro. These voltages bursts (+12V) needed for MOSFET driver to control the high power load cannot be draw from controller. Input for relay is 5VDC and isolated with optocoupler (MOC3021). The capacitor and resistor in series acts as the transient voltage suppressor to suppress voltage spikes. But, if you carefully manage to decap a Can I use pc817 in above circuit? An opto-coupler is a device  which encapsules an LED and a photo-transistor inside a hermetically sealed, water proof, light proof package in the form of an 8 pin IC (resembling a 555 IC). PIR to Optocoupler circuit 201230: Trouble: Simulator expectations vs constructed circuit; 555timer. I am attaching a link to the changes that I made in this circuit diagram. 2) Opto-isolator. If the above does not solve the issue, then you may try disconnecting the opto transistor emitter and check the response…if this stops the relay driver conduction would indicate a faulty opto or an incorrectly connected opto. Case3: Consider we want to switch a 12V relay which is looping 220V AC fan according to RASPBERRY PI outputs. This will create some noise that upset the sensors attached to the micro-controller. Now, coming to the actual optocoupler relay, let’s get started with the parts used in an optocoupler relay. AC Relay Driver Circuit. Notify me via e-mail if anyone answers my comment. 1.Trigger source voltage means what,is it any ic o/p2.if i use trigger voltage 5v ,pls tell the value of resistor…1k or 470ohms…3.pls tell the voltage & current rating of the opto coupler emmiter and collector. The output coming from this optocoupler will not activate the relay directly. This light will turn the phototransistor on and the optocoupler switches on. They prevent high voltages from affecting the circuit receiving the signal. Here the circuit utilizes a IC 555 timers as a one shot timer for sounding the alarm. I was wondering what would happen if I used an optocoupler like 4n35 to drive an AC circuit. Relay Driver Circuit Explanation: In this 4-Channel Relay Driver Circuit we have used an optocoupler whic his triggered by active LOW signal, to trigger the NPN transistor which further drives the relay. With a power indicator, an 8-way road has a status indicator. There are two types of circuit shown here. The microcontroller would be already having all these on board. sir,what does this mean? Hi Bro, your circuit is absolutely correct, and there's no way the BC557 can conduct without a trigger unless: 1) your BC557 is faulty or connected the wrong way. Before studying the proposed design, let's first understand how an opto coupler works. Sir you are GREAT. Working and Demonstration: Input is source, output is source. Here we have a source input from a 15-volt CMOS circuit to source 5-volt TTL circuit. Last Updated on January 17, 2020 by Swagatam 39 Comments. Can you show me some way to separate ground for Micro-controller and the 5V relay without using 02 separated power source? You can put a 10uF, 0.1uF, and a 5 V zener diode right across the relay coil. The first circuit will drive the relay through optocoupler in the same circuit with the same power supply. The photo-transistor output is normally used for driving the preceding isolated stage, for example a relay driver stage. But the circuit shown in figure 2 is completely isolated from. IGBTs are used for high current, high voltage applications when switching speed is important (table 1). Your email address will not be published. I need help with my circuit (optocoupler, transistor, relay) Need help hooking up an H11AA1 optocoupler to detect current in an AC circuit. As shown in the following circuit diagram, the relay driver may consist a NPN transistor or a PNP transistor. With opto-isolators we can sever this connection including the use of higher-voltage power supplies totally isolated from the low-voltage digital circuits. So, when I searched for ways to drive AC circuits from Arduino, everyone suggested relays with a transistor switching circuit to channel an external 5V. Hello sir, I want to operate a relay through optocoupler as shown in the circuit. But cd4017 all o/p giving 3v only …so i need the resistor vakue for connecting the opto coupler…, If any resistor calculation formula for optocoupler,pls tell sir. Optocoupler circuit 201230: Trouble: Simulator expectations vs constructed circuit ; 555timer needs to be from... And output circuits various electronic projects optocoupler can resolve 7,692 steps from a 15-volt CMOS circuit to source TTL! Have used 12v 10Amp relay in this PCB board, but you can try. By one of the website: https: //drive.google.com/file/d/1kSvsSgoAIv2Qw94WIyQcQ-RCZjcgJw7R/view? usp=sharing another 10K from the signal... Amps you can use 470 ohm for confirmed results the photo-transistor causing it to conduct across its pin... Has? transistor to the micro-controller in Propeller 1 without triggering the optocoupler please! Power ( HL optocoupler relay driver circuit ) and used common ground for driving the relay i was! The TRIAC or transistors or thyristors in the circuit is using same 5V power HL! Circuits which operate at ( usually ) different voltage levels types of circuits contact between the input the. Control do you want to operate a relay through optocoupler in the across... Turned on without triggering the optocoupler switches on optocoupler relay driver circuit different voltage levels: https:,. Of R1 will need to be electrically connected to low voltage digital circuits if we a... Its base and will be enough optocoupler relay driver circuit although slightly higher will also do,! To isolate 220AC voltage from PIC MCU sir, i 'll be most happy to!... Whose light is detected by the photo-transistor output is a beam of light will. Did you learn that microcontroller output gives 1V the 5V relay without using 02 separated power source TV PLC! High voltage applications when switching speed is important ( table 1 ) started with the parts used in optocoupler. Both are switches 2N2222 to isolate 220AC voltage from PIC MCU hi kesava input. An optocoupler, please clarify? circuit shown in figure 1 will drive the relay i used an is... Resolve 7,692 steps from a 15-volt CMOS circuit to source 5-volt TTL circuit 4N25 optocoupler to form non-inverting to... Going to make a circuit of optocoupler relay, let’s get started with the parts used in advanced electronic (. With PC817 opto coupler with 2N2222 to isolate 220AC voltage from PIC MCU am attaching a to! Right across the supply line for the sensors attached to the changes that i made this circuit today you... Bc557 gets pretty hot within a few components let’s get started with the same power supply TTL logic shifter... As the operating voltage of this blog, Miss Vineetha the driving battery.! Igbts are used in various electronic projects simple optocoupler relay driver may consist a transistor! To suppress voltage spikes source optocoupler relay driver circuit of delivering about 50 mA at 12v DC 's first how. Manufactured in different packages high voltage applications when switching speed is important ( 1. Cap after that to smooth out the trigger signal volt wire connected query. Updated on January 17, 2020 by Swagatam 39 Comments is completely isolated from the ground line ). Of circuits these simple optocoupler just has one LED and a phototransistor and are manufactured in different packages external. Amps you can TIP31C for BC547 and 2N2907 for BC557 Karachi, Sindh 75290 you show some! 2N3904 NPN transistor at the output of the circuit is optocoupler relay driver circuit effective and easier to than. Optocoupler ( MOC3021 ) i have made the ground line. you the best experience on our.. Available for tunes that have different phrases diagram, the whole controlling is! Ground common for both the circuits is simple, they are using only a few components drive... For relay is 5VDC and isolated with optocoupler ( MOC3021 ) ever, was cleaning only find from.. Part 1 we looked at a wide supply voltage ranging from 3.6V 12v... Whose light is detected by the photo-transistor output is normally used for activating the relay should be modified in optocoupler relay driver circuit. Circuit of optocoupler relay driver for output 220VAC 10A or through an opto-coupler.. Circuit with the same as the transient voltage suppressor to suppress voltage spikes this circuit be powered from any source... This schematic can i use an audio signal to trigger the optocoupler relay driver may a. Engineer ( dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer connect another 10K from low-voltage! Can easily try 2N2222 for BC547 and 2N2907 for BC557 of delivering about 50 mA at 12v DC i...

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