Questions tagged [relay]

A relay is an electrically controlled switch. Electromechanical relays use an electromagnet to activate mechanical contacts, solid-state relays use semiconductor switches.

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15 views

How do I control a 12V relay with a 1.8V microchip?

Background I have a 12V power supply that is connected to a switching regulator to get a 1.8V power signal. I have a microchip running at 1.8V and want to control a 12v relay via GPIO. The relay is ...
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True RMS earth leakage relay

The relay shown below [Link] claims to trip in less than 25 ms to fault currents that are 5 x greater than the set trip current. Also the minimum time settings are inst (what time is "inst") ...
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556 views

Why is this relay turning on when booting up/down my raspberry PI?

I bought this relay from amazon https://www.amazon.co.uk/gp/product/B06XK6HCQC/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1 I'm trying to use it to turn power on/off for a stepper motor I'm ...
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39 views

two independent zones from central heating unit

I have a central heating unit (a pellet stove) for a two floor house. I'd like to control it independently from two thermostats. The stove at the moment is controlled by a single thermostat input and ...
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34 views

Feedback schematic/pcb 16 channel relay wifi module

I have a few questions about a 16 channel relay module I designed, maybe someone can help me. Generally this consists of a ESP-12F, two I2C IO Expander, two darlington array ICs to drive 16x 5V relays....
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45 views

Dual (additional) battery E-bike solution

What would be better solution when attemptng to install additional battery on E-bike: Parallel connection and increasing total Ah (batteries are from different manufacturers). Idividual usage of each ...
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2answers
37 views

Mechanical Relay “Must Operate/Release Voltage” - Confusion Around Terminology

I have a relay and am confused by its operation. It is a Potter & Brumfield Relay, model R50-E2-X1-24V Datasheet: https://www.westfloridacomponents.com/mm5/...
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2answers
106 views

How can I increase the output current to make it sufficient for relay module?

I am using the following circuit as an industrial warning and control system. According to input signals, LEDs and other outputs are HIGH or LOW. So, 24V in input is not always connected actually. ...
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27 views

MOC3043 on Multisim

I've been looking to simulate an optocoupler-triac driver for an AC Load in Multisim but I can't find a working model for a light emitting optocoupler specifically(the MOC-30XX family). I would really ...
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50 views

Would this single coil latching relay circuit work?

The goal is to switch it in one direction by the upper button and then the other by the lower button (momentary push). If it would work, where should I place the protection diodes? Or is it enough if ...
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78 views

Is a flyback diode necessary with a relay module for operating a Solenoid valve?

Assuming I have a relay module (I'm not sure about its features) that is connected to a 12 V DC solenoid valve and should be operated by a microcontroller. Do I need a flyback diode connected with ...
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Voltage drops after connecting to the relay [duplicate]

I used bridge rectifier circuit to convert 230v AC to 12v DC and connected to relay, before connecting to relay vtage is 12 v but after connecting it drops to 0.77 I use 12v 10ampa relay, do anyone ...
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220VAC to 12VDC Capacitive Dropper Power Supply Driving Relay Problem

I was making PIR based light on/off using tric initially, but led flicks continuously when it is ON state but incascent bulb there is no flicker Now I tried with relay but once really is connected ...
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Can't find suitable Bistable/Latching 12V DPDT Relay

I have a 12V actuator that is controlled by a 12V programmable timer. So my pulse is either power or no power. I am using a regular 12V DPDT relay which works fine. However, I would like to use a ...
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Making Relay Tester [closed]

I use Omron G2RL-1 relay. I want to make this relay tester to check whether it is good or bad. Would you suggest a simple tester circuit?
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363 views

What's wrong with this latching relay circuit?

I've been told that this relay circuit should latch. I built it and it does not. I want the LED light to stay on after the N.O dP switch is is closed and then released back to its N.O. state. Using 24 ...
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89 views

Can I use relays for heating element?

I know that relays are used for heating element or any electronic other device with high wattage/high current. But for my application, I am using a Nichrome wire as a heating element and only want to ...
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73 views

What could cause a relay not to release immediately? [duplicate]

I have got a relay that doesn't release immediately after power is cut off. What could be the possible causes of this?
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63 views

Solid State Relay replacement for SRD-12VDC-SL-C

I've bought a relay board controlled over modbus from ali that contains 16x SRD-12VDC-SL-C relays to control my heating cables on the floor using rpi and nodered, my question is can I find a SSR pin ...
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1answer
40 views

How to use a Bluetooth-controlled relay to simulate a button press on a garage door remote?

As a DIY project, I'd like to use this keypad (Danapad by Danalock) to open my garage door. The keypad communicates via Bluetooth with a "universal module" that's designed to open gates, ...
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37 views

Relay kept on by near transformer

I had a wireless powersocket for my PC peripherals until it stopped working. It just kept closed even if I turned it off and heard clicking. I opened the socket and replaced the board inside with my ...
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How to stop electric fluctuation while using PIR sensor

I used a triac to control the AC current to my led bulb 💡 but once the bulb is in on state, it's flickering. I made a bridge rectifier and using transistor connected to triac, the input is given ...
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78 views

How much energy does a transistor use? Is it worth building a NOT circuit for a relay?

I'm a super beginner, but I've developed a circuit that appears to work. My question is if there is a better way to do it. I have two power supplies. The primary supply will power a load. When the ...
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17 views

How to provide power to case fan and light bulb with RPi and relay?

I want to try to build a simple, straightforward RPi setup to control a incubator, and to provide a web interface to control it. Background--I'm a software girl, not really any experience with ...
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34 views

Why does this magnetic relay max DC voltage rating is much less than its max AC voltage rating?

Below is a specifications of this magnetic relay: For AC and DC the max switching current is given same as 10A. On the other hand, max switching voltage for DC is drastically lower than its AC ...
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3answers
391 views

2N2222 low side relay switch not turning off

I've been pulling my hair out over this for weeks and I can not for love nor money work out why it's not working. I have a very standard NPN low side switch setup to turn a relay on/off from a 3.3V ...
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How to check quality when procuring components? [duplicate]

How can a procurement person check the quality of components before purchasing, like resistors, relays, buzzers, capacitors e.t.c
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2answers
162 views

Relay contact insulation doesn't seem to be enough

I'm working with an ESP32 and a 4 relay module. The problem seems to be that the insulation of contacts in the relay is not enough. Relays close perfectly and my lights turn on, but when they open, a ...
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106 views

What is this sheet metal cutout on the PCB?

This PCB is from a car body control module which contains a bunch of relays to control various motors (windows, door locks, etc.). There is no RF devices on this board. This sheet metal cutout looks ...
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2answers
142 views

ESP-32 not working with big motor

I have spent the last two months trying to build a door controller for a chicken coop. The idea is simple: The ESP32 recieve signal from my house Wi-Fi to close or open the door. So the corresponding ...
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2answers
140 views

Can I use a ULN2003A IC as many transistor switches?

I want to make home automation using Arduino. Instead of relay modules, I prepare my own relay module using relays and transistor switches, in between the Arduino and relays. I want to make many ...
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1answer
48 views

Can a feed wire also be used as a relay trigger?

Can I use a low voltage wire (10.5 V) as a supply AND trigger With a single pole double throw relay? Is there a solid state option available? I need a way to switch power back and fourth to LED lights ...
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1answer
45 views

ULN2003A output not going to logic low

I am using an ESP8285 to make my own wifi relay device. I am using an ULN2003A to drive the relays, I have the 5V relay coil voltage connected to COM and the other coil connected to the output of the ...
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36 views

Is this implementation of activating of boom-arm vehicle barrier correct?

Previous Post From my previous, I asked about how the trig pin works on the boom-arm vehicle barrier. I would like to know if the below circuit is correct? This circuit assumes the boom barrier opens ...
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1answer
30 views

Advice on Arduino project for smart light bulb planning

I'm starting a new project (for personal use), I want to build a circuit that will enable me to control a lightbulb through my phone. I want to use it as an additional lighting at my living room. ...
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1answer
66 views

Dual control of relay

My current problem, as a noob, is kind of an OR problem. If you feel the urge to call me an idiot or any other choice name. Pleace feel free but I would appriciate if you can explain why. Still trying ...
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Is AC relay “inrush” current caused by more than the mutual inductance effect?

My interest is in the "inrush" current of an AC relay. I took apart a 24VAC one. It's energized current was about 40mA but when I removed the plate that is pulled by the electromagnet, the ...
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1answer
54 views

Understanding of how the trigger connector works on a boom-arm vehicle barrier

I would like to know how the trigger (TRG) pin works on the boom-arm vehicle barrier. From my understanding looking at the circuit below for an external radio receiver, when the trg pin is grounded is ...
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2answers
298 views

Can 16A relay be used instead of 8A relay?

I have a relay with 12V and 8A, it was not working properly. I want to change it with 12V 16A relay is that possible? Because I am thinking amper is the power of relay. If a relay can open 16A circut ...
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1k views

Control 16 motors with 8 relays

I build a project using 8 relays in a matrix (charlieplexing) to control 16 motors (actuators), plus one relay to control two DPDT relays to reverse the power for the motor to turn reverse. I only ...
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Timer not having output after initial powering

DGM TIMER RELAY BOARD 12V 1S-1HR Time Delay ON or OFF 12V Relay Board with jumper settings and 8 Time Ranges selectable from 0.1s up to 1 hour accessing loads 250VAC 10A or 30VDC 10A I believed this ...
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4answers
90 views

Can I use some type of transistor i.e. BJT or MOSFET to act as normally closed relay?

I am designing a power bank which uses sustainable power generation methods for a school electronics project. It is based around the Arduino Nano. At the moment I am planing to charge an 18650 cell ...
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2answers
61 views

DC Relay Module for Switching ~200 VDC @ 1.4A with Arduino Controller

The context of the problem is that I am trying to switch a ~200 VDC Meanwell Constant Current Supply @ 1.4A, to selectively power on a number of COB LEDs connected in series. My initial approach was ...
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1answer
44 views

Detect power outage and disconnect heavy loads from the UPS [closed]

I am looking for a simple system to detect power outage and disconnect heavy loads from the UPS backup to maximize the longevity of the power backup. The UPS works on a 24-V battery. The UPS switch ...
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1answer
45 views

Is it more reliable to connect to both sets of DPDT relay contacts when only SPDT is needed?

I am adding a socket mounted relay to a PCB and only need one set of contacts (SPDT). Does it increase the reliability of the component to connect the both sets of contacts? Are there any other issues ...
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1answer
48 views

How to pick a step down transformer for powering MCU?

I need to select a transformer to power my microcontroller, relay, 7 seg display and few LEDs. The maximum current draw will be 300mA. I doubled that to improve reliability. So the AC current works ...
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1answer
24 views

Can't get 2-relay module to work through JD-Vcc

I bought this 2-relay module: https://www.amazon.de/gp/product/B00E0NTPP4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 I'm testing it out using a 5v 1 amp power supply. If the JD-Vcc jumper is ...
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How to make a Triple Pole Double Throw relay in Proteus?

I have been using been using Circuit Wizard for awhile now to make simple wiring diagrams, to test if they work and then have to redo then in Visio, to add images of components that are not included ...
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18 views

Is it possible to enable wireless switching between two EV charging circuits using a relay and an ESP32 controller?

I am working on a project where the end goal is to enable bidirectional charging in an electric vehicle. The vehicle is equipped with a unidirectional OBC that connects to the 230V AC mains via a ...
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205 views

Why can't I trigger my relay?

Solution This issue was caused by the choice of SOT-23 symbol when creating my PCB in KiCAD. As you can see in the picture below, there are a number of symbols associated with transistors in the KiCAD ...

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