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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Timer relay used for power button bypass

I have a small control panel device (controls a separate relay box) that has a simple power button I am looking to automate. You press the top left power button and the panel comes on, press it again ...
Alex's user avatar
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Fuses to protect a NFC 3-Phase Control Relay

I am trying to understand which fuses to use to protect an NFC 3-Phase Control Relay (RMNF22TB30). The installation guide describes that a 1A CC/gG fuse for each phase is needed. I would like to use ...
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Replacing a reed relay with SPDT/DPDT MOSFET configuration [closed]

My project consists of a reed relay that is currently switching between two outputs based on my control signal from the processor. Due to the maximum saturation of the relay, the signal starts to ...
Devansh Dave's user avatar
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How can I make a switch using a MOSFET to control an input signal? [closed]

I have a two channel relay module that takes 12 V to power. It also has two inputs, which take either 12 V or 0 V. On the other side of the module are the NC and NO and COM pins that I am connecting ...
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1 vote
1 answer
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Use voltage of canbus wire to control relay

We want to energize a relay when there is data on the canbus wire. When there is no data, the voltage of the line is 0, and when there is data, the voltage is more than 2V. The following diagram ...
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Snubber design for a relay that controls a 30W AC fan

I am trying to switch a 30W, 230V AC fan and a LED strip with an Arduino from D11 and D12 pins. In my previous experience, the EMI generated while turning off the fan bricked my project within months ...
CaveScientist's user avatar
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PCB layout for inductors

How should inductors be placed on a PCB? I have a relay (MCHMR1-S DC24V) switching about 3 A of current. Do I need to separate the relay from nearby analog and digital components, or is it fine next ...
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LiFePo4 Battery's BMS is clipping when my relay switch kicks-in

simulate this circuit – Schematic created using CircuitLab My trolling motor had no "kill-switch" that would turn the motor off should I get dumped into the water. So I purchased a ...
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Grid tie inverter 200 W with low voltage auto disconnect

I have a grid tie inver that produces at most any day 200 watts from my 12 V battery bank. I also have a adjustable auto low voltage disconnect circuit that disconnect the 12 V from inverter when ...
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2 votes
2 answers
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Need help with AC relay wiring

Got the following relay Taiss/AC 220V (YJ2N-LY AC 220V) A picture and a wiring diagram are below. Given: AC 230v constant L input AC 230v signal L input N input , How should I wire the relay to get ...
Alex Smirnoff's user avatar
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Relay circuit for DC LED strips switch

Is this schematic OK for 24 V UVC light control via 5 VDC relay?
Zunuran Nasrullah's user avatar
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Issue with solenoid valve sparks despite using two 1N4001 flyback diodes [closed]

As a student, I'm currently working on a science project where I intend to connect a 12V, 2A solenoid valve to a relay and subsequently to a Raspberry Pi Pico. The solenoid valve is powered by a 12V, ...
Tanmay Sonar's user avatar
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BLE relay to control my garage door - security concerns

I would like to use Shelly 1PM Mini Gen3 to control my garage door. Since I do not have WiFi coverage in my garage I will rely on Bluetooth. However with this setup I am not sure if this Smart home ...
sidlo's user avatar
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Voltage stabilizer or voltage protection device for irrigation setup [closed]

I have an irrigation setup in a rural area with voltage fluctuations. The irrigation setup consists of a Hunter X2 Controller powering a pump start relay which in turn runs a 1.5 HP submersible motor ...
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Can I use a 30A+ PCB relay to drive an AC Motor instead of a DIN Rail Contactor?

I have a project that involves a microcontroller switching on and off an AC motor (water pump) of no more than 1hp. I found these interesting contactors on aliexpress but I was wondering if I can ...
kadhem Alabdulmuhsin's user avatar
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Electromechanical relay snubber

I am using an electromechanical relay in a relatively medium-current project, in the range of 3-5 amps. I have designed it so the coil is controlled by a microcontroller through an optocoupler, with ...
lemon's user avatar
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Counting relay circuit

I'm looking at making a circuit that activates a 12 V momentary relay a settable number of times with a settable wait time between each activation. At the moment I'm using a Jaycar KA1732 kit, but it'...
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How do I use a pull-up resistor to trigger a relay?

I have a 12v automotive electrical system that has a pressure switch that switches at 40psi. It is normally closed to ground (low pressure), and goes open when switched (high pressure). The switch ...
Chris S's user avatar
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How can I trigger a 3V relay with no current, just a 3V signal?

Is it possible to trigger a 3V relay with a 3V signal voltage carrying no current? I want to be able to operate a 12V ebike lighting circuit via the brake lever which also operates the motor cut off ...
Jasperhound UK's user avatar
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1 answer
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5V DC relay gets stuck when using 220V AC bulb

I designed a circuit that has four relays on it. The input power source is 14.4V 2.2Ah lead acid battery. I am using an MC33063 to step down the input voltage to 5V. The relay driver circuitry is ...
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Shutdown circuit of an EV gokart

My student project team is planning to build an EV gokart. It's supposed to have a shutdown circuit/kill switches. I was planning to implement a DC contactor/high power relay to connect/disconnect the ...
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What does the graph 'Short circuit monitoring interval Vs time' mean in this SSR data sheet?

In one of the Panasonic Solid State Relay (SSR) datasheet,the short circuit behaviour is as shown below : If short detected- > Trip the relay -> Periodically retry untill the fault is cleared. ...
Divya K.S's user avatar
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RC delay circuit for delay

I want to switch the contacts of a relay after aprox 1 second. I've never done something with a relay before, so please can you check if I understand the specs correctly? This is the one I saw https://...
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Power + input DC relay from singular source via SPDT toggle switch

I hope I'm not reinventing the wheel here. I'd like to separate two circuits (charging and discharging circuit) as I'm making my own tablet from RPi and bought in LiFePO4 powerpack. For my piece of ...
pavl0squiet0s's user avatar
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2 answers
139 views

Keep a relay latched for 2-3 seconds using capacitor

Building a simple prototype to keep the relay latched for a couple of seconds after power is removed - so essentially the power to relay acts as the Input signal. This means I have to store energy in ...
tunafish24's user avatar
-1 votes
6 answers
329 views

How on Earth can a solid state relay be constructed?

Relays are very handy components. Relays allow current to both directions on the controlled load circuit so they can be used for both AC and DC. However, relays have a finite lifetime if connected/...
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How can I short three wires together using an Arduino?

I have a wired shutter release for a DSLR camera. It has three wires within it (red, blue, and green). After disassembling it and doing some testing, I've determined the following: Wire Voltage Blue ...
cocomac's user avatar
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Is this relay circuit valid?

This is my current circuit draft Which had the SPST-NO symbol adapted from the supplier's symbol I have not chosen any specific parts for diode, resistor or transistor. ALDP105W Relay datasheet: ...
Freddy Mcloughlan's user avatar
2 votes
1 answer
117 views

Is it safe to use 250V rated relays with UK mains voltages?

UK mains voltage is 230V (RMS) with a tolerance of -6% and +10%. That gives it an upper limit of 253V (RMS). Lots of relays are rated up to 250V: e.g. the Omron G5Q series has a "rated ...
Rob Gilton's user avatar
2 votes
1 answer
220 views

Is this the correct isolated circuit to control a relay output from a Raspberry Pi GPIO?

I am making a circuit for an optically isolated relay output controlled by a Raspberry Pi GPIO pin. I am not sure if this is the correct way of doing it. Can someone please help me out on this? Edit: ...
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How can I implement an active current limit (with auto-recovery) for a solid state relay (SSR)?

I am using a G3VM-61QVH SSR which doesn't have a current limit feature. I would like to have this feature added through an external circuitry. What are the possible options for me? Note: Typically an ...
Divya K.S's user avatar
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2 Coil Latching Relay

I am using a 2 Coil Latching Relay and I was hoping that someone could confirm if my understanding of the relay I am using is correct. The part number I am using is a TQ2SA-24V (https://api.pim.na....
user3171804's user avatar
1 vote
1 answer
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What paths can the induction spike from a relay controlling a Fan and Aircon unit take? How to problem solve it? What would you do?

Problem: I have an induction spike feeding back into my AirCon and Fan control project when the fan or Aircon is switched off. The program keeps running on the microcontroller but the spike ...
Jonathan Birch's user avatar
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1 answer
102 views

Optocoupler as switch

I am trying to use an optocoupler as an ON/OFF switch for an analog circuit. When high/ON voltage is applied at input, the output side should be short circuited. Otherwise it should act as OFF/open ...
Soham Ghaisas's user avatar
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1 answer
143 views

Explanation of the circuit diagram of a PIR sensor activated light

Can someone please explain the operation of this circuit diagram of a PIR sensor led light. The high voltage "ground" connections in the original diagram have been replaced with connections ...
Francis Lapaba's user avatar
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2 answers
202 views

Driving SSR with ESP32 3.3V GPIO

I have made up a basic output circuit and it seems to work, but I'm not clear how to size the resistor. I'd like to make sure this works for the long term and I am not overlooking any details. How ...
Spy's user avatar
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Relay for long LED run need 4 amps - MOSFET or Coil?

I've been using coil relays for automotive electrical stuff for years, but in the MCU / embedded world there are PWM driven relays as well. I get that 5v will operate the coil on the smaller 10 amp ...
WouldRatherBuildAMotor's user avatar
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1 answer
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Relay not triggering on initiation

Issue: I have a relay which is pushbutton controlled to turn it on or off. There is also an LED connected to the MCU output pin controlling the relay. The whole thing is powered by an AC - DC power ...
Rahul Goyal's user avatar
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2 answers
57 views

Relay board design issues with the relay driver

I have followed the post and tried to control multiple relays using Arduino. Instead of using the original relay, I used NA-5W-K. However, the relay on my designed PCB doesn't work. The original ...
Dario's user avatar
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Disconnecting Stepper Motor While Active

I've been playing with using one stepper motor driver to control multiple bipolar stepper motors (one at a time). I've found disabling the stepper motor, using a relay array to switch to another ...
JamesWilliams's user avatar
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1 answer
43 views

How can I wire a relay or contactor to an elapsed time meter?

For a DIY project, I want to run the tools in my workshop through a special receptacle in which I have connected an elapsed time meter to be triggered when the tool (e.g. drill, saw, etc.) runs. To ...
SaM's user avatar
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Relay driver ULN2803ADWR not able to drive new relay NA5W-K

I am using an Arduino Nano to drive 24 relays through three ULN2803ADWR chips. Each output of the 74HC595 is connected to the input of the ULN2803ADWR , which drives a specific relay. I initially used ...
Harry's user avatar
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Turning on a fan through a relay power-cycles a Raspberry Pi Pico

I'm trying to control a fan 1 using a Raspberry Pi Pico and a relay 2. The relay is connected to the Pico on pin 19 (GP14) for signal, to GND, and to 3V3. The Pico is powered and controlled through ...
Johannes Bauer's user avatar
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2 answers
72 views

Identify Components in Oven

I am disassemblying an oven to make a reflow oven out of it. I need help identifying two components. The simplified schematic of the system is as follows: Component 1 (picture below) is marked as ...
mlx11's user avatar
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1 answer
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Relay with bypass switches haywire

The lamps are normally operated by relays. When the relay or relay driving circuit fails totally, the bypass switches are to be used as fail-safe to operate the lamps. The key operated switch which is ...
Kumaran's user avatar
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Switch between two DC sources using Schottky diodes

I'm building a small power bank as a backup for my router due to frequent power outages. The router takes 12 V 1 A, even though, it can take between 10-15 V without an issue. I'll be using CC/CV ...
Ali's user avatar
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5 votes
4 answers
2k views

What exactly makes a reed relay different from a regular relay?

I understand that a reed relay is a reed switch with a coil added, but the internals of a reed switch: (source) sure do look a lot like the contact portion of a regular relay: (source) What exactly ...
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12V relay to disable a circuit while starting

I’m looking for a relay for testing purposes. Not exactly sure what relay I need.I want to disengage ignition coil circuit when the starter solenoid is engaged. I am figuring that I’m running a wire ...
Bruce Trautman's user avatar
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T12 soldering station problem

I am trying to make a “cheap” t12 based soldering station. However there is a problem. Since T12 tips have the thermocouple and the heating coil in series, you have to turn the driving MOSFET off, ...
De PuP's user avatar
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1 vote
1 answer
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Switching relay with 2N7000 and Raspberry Pi GPIO

I'm debugging a circuit on a home project and hoping for some advice. I have a relay set up like so: The behavior I'm seeing: When I toggle the Raspberry Pi GPIO to ...
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