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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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How to: Led Dimmer switch to on/off switch

I have a led strip with a wonderful no touch dimmer on the bottom of the kitchen cabinets. What i would like to do is to "link" the inner lighting of the cabinets to the same switch, in a manner that ...
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2answers
41 views

Alternative to alternating relay? or help?

I'm using a littelfuse relay shown in the link to switch motor directions. I'm sending a pulse to the relay switch of 0.02s in order to switch between the L1 and L2 contacts. The pulse seems to be too ...
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46 views

I'm having a problem with making an SPDT relay using MOSFETs

Good Day! I'm trying to make an Electronic SPDT Relay using MOSFETS, (Normally opened, Normally Closed and COM) it works like this: if the P channel Mosfet is on, the N channel Relay must be OFF, ...
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1answer
23 views

Control relay (active low) without an transistor

I am using the Sain Smart 16-channel relay module. A relay is energized when the corresponding input pin is connected to the ground. I am using an Arduino to control the relay module using the GPIO ...
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2answers
43 views

A GPIO pin opening/closing a high power circuit?

sorry if this a very beginner question but I'm still quite new to the field of electronics generally. I have a requirement to connect a Raspberry Pi to an existing electronic lock, and hopefully use ...
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1answer
21 views

Trigger motor through Raspberry Pi if it's plugged in, otherwise through touch sensor

I'm trying to design a custom PCB that is powered through USB (5V DC), has a touch sensor, powers a DC motor and can optionally have a Raspberry Pi Zero plugged into it through a GPIO header. If the ...
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0answers
75 views

Relay slow respond - power-on delay

[This question has been completely re-written since originally asked.] This circuit: shares its power supply with a motor connected to CN1 NC relay contact. On power-on the motor runs for about 0.5 ...
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0answers
21 views

Variable voltage relay (Open 10v and below, Closed 12v and above)

I need to trigger (close) a relay when my circuit voltage goes from 9v to 12v. Trying to keep this simple but fear that the voltage difference is too small for relay to open when voltage drops to 9v. ...
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1answer
31 views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
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2answers
96 views

Solid state relay does not reset

I replaced some old electromechanical relays by those solid state relays from Wieland to improve the switch speed of my system but I can't manage to switch off the solid-state relay. Here is the ...
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2answers
55 views

How to connect snubber across the relay?

How can a snubber circuit be connected accross a relay. Because when we connect a snubber accross the relay then the capacitor always allows the current to flow through it. Relay I am using is a 12V ...
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3answers
579 views

How to keep the state of relay

In schematic below when current exceeds the set point of PR1 it toggles the relay and as soon as current drops the relay goes back to normal state: How can i keep the relay state as triggered even ...
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2answers
48 views

Select between two sources with transistors

I'm sorry if this has been asked before but I can't find useful data on this matter. I have two sources of data and I want to select one of them using transistors. If I had to guess I'd make the ...
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2answers
37 views

Digital control of contactors

We are trying to control a bunch of 3 phase contactors using an HMI. The contactors' coils are activated by two lines of the 240V 3 phase source (L1 and L2). We are trying to figure out if the ...
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1answer
37 views

Does the JQX-115F-Q power relay step down voltage?

Could someone help clarify how the JQX-115F-Q power relay works? I appreciate this is a about a specific component so I've included a picture to show the markings. It's the markings that has got me ...
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1answer
73 views

Running a Relay on DC

This is my diagram: I'm running a breadboard with a NodeMCU powered by a USB 5V say from my laptop. From the NodeMCU, I'm taking a 3.3v out to the VCC of the Relay and GND to GND of the relay with ...
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1answer
45 views

DC Motor Control with PWM and Polarity Switching

I want to be able to rotate the motor both clockwise and counter clockwise while also controlling the speed of rotation of said motor. This is a small dc motor and the whole thing is running on 5V the ...
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2answers
75 views

PIC interface with Relay

I am interfacing a PIC16F877 with a 5V DC relay. I hooked up the relay to the same 5v that power up my PIC with the appropriate transistor, diode, voltage to power up an LED to NC and LED to NO, I ...
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1answer
47 views

Problem with noisy relays

I am doing a project right now that uses four SRD-5VDC relays. They switch power from an outlet to the rest of my project. Unfortunately they make a loud click every time they switch. Is there a ...
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1answer
26 views

Rocker switch & Electronic Relay switch circuit (240v)

I have an already existing circuit between the mains wall supply and a window shutter (see image), it has a gewiss rocker switch for opening and closing the shutter when you press and hold one of the ...
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1answer
40 views

Can a contactor be used as a temporal logic bit as in PLC?

I want to design a control logic circuit using relay logic. I want to have a bit as a marker as in PLC. Can I use a contactor for this function and then use auxiliary coils as a latch as in PLCs.
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1answer
66 views

Facing Issue to interface switch relay & potentiometer with PIC16F877a

I am trying to operate switch relay when Resistance is at peak value (1Mohm) using PIC16F877A. Now the issue is as below, When i run the same code with Proteus , Its working fine. But when i run the ...
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1answer
73 views

12v relay latching until no power [duplicate]

So I'm awaiting to wire in one or two relays so that a circuit is not powered until a push button is pressed. Then the circuit remains powered until total power is turned off. I've been trying to ...
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0answers
30 views

relay causing problem to controller

I have a relay which is electronically controlled by a computer (Odroid) and used as a switch for a high power circuit. The computer and the other circuit are powered with different plugs on the same ...
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0answers
51 views

Mystifying boiler control circuit

I have had a few issues recently with an electrical boiler and I have replaced a few electrical parts (relays, time delay switches,...) to keep it running. Doing so, I noticed that the internal ...
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0answers
32 views

PLC Relay Output Circuit

Can someone help with this question? I've answered it to the best of my knowledge based on the learning materials provided but the answers I've gotten are exactly the same as the example. Should 5v be ...
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1answer
81 views

A beginner that could use a few tips on wiring my first circuit involving relays

I am in no way experienced or knowledgeable with circuits or electronics passed installing my own car subwoofers and amps, or swapping out pickups on a guitar which means I only basically know how to ...
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2answers
36 views

How can I have different circuits relays based on a particular voltage input?

I want to build a circuit that is dependent on an input from a thermistor which is in a circuit that is a voltage divider. Now if the thermistor is showing low temperature, then I want to increase my ...
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0answers
32 views

Would the 12V relay coil induce significant back and forth current in copper traces of PCB?

will it induce currents in traces just below it or nearby it on PCB, if relay gets switched many times during operation? I am concern about the coils magnetic field change during switchings. Are ...
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1answer
24 views

Control relay using split core current transformer

I have a YHDC SCT013-03 split core current transform which lists an output range from 0 V to 1 V for an input up to 30 A. My objective is to use this to open an close a contact switch. The way I was ...
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0answers
57 views

Power supply switching circuit design

I am trying to design the power supply needs for my project. It has 2 loads in parallel, one 12V and one 5V. I want to power it from as 12V Wall Adapter that will drive my 2 loads and charge the ...
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0answers
37 views

The best type of electronic switch to control the signal coming from a pickup coil on a motorcycle

So, my motorcycle has an ignition system that's not really secure, all someone has to do is pull the ground wire going to the ignition coil and anyone can start it up. The only other way to stop it is ...
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0answers
32 views

Delay timer for car bar light to stop mode cycling

I just brought a bar light for my vehicle. My problem is the light has 4 modes (white, white flashing , yellow, yellow flashing) and the modes are triggered by turning the light off then on in less ...
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1answer
46 views

Relay Circuit Explanation

I am trying to understand relay circuits better. I have two circuits in question below. Left Image I understand Pins 2 and 9 are the coil contacts. I would wire a microcontroller outpin pin to a ...
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1answer
48 views

2 Coil Latching Relay Setup

I am trying to use a relay to power a RPi for the first time and just confused by how I should wire it. I am trying to control the relay with a ATtiny10 MCU (microcontroller) if that helps in ...
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1answer
81 views

Easiest way to control a led remotely [closed]

I was wondering what is the easiest and cheapest way to have a high power led (3 Watt) turn on/off and blink remotely from a distance (60m-100m). I've been looking at some microcontroller solutions (...
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1answer
49 views

Connection For simulation touch using 1ch relay

http://gameautomators.com/book/Electronics/4-simulation.html Hi here is a reference to make a touch simulation with rpi and 1ch relay I can't understand how to connect gpios with relay. There are ...
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2answers
57 views

Non-latching relay as an “AND” gate

I have a situation where I have two inputs, A and B. These inputs control a device. Input A acts as a direction select and Input B acts as a "GO" command. I only want the device to "GO" if I know that ...
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1answer
27 views

Hooking into Qi charger status LED to power something more

I have a Qi charging module and I want to light up a higher-power string of LEDs when my phone is charging through it. The module has a blue status LED to show it's charging, which I think is where ...
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1answer
54 views

Relay timing modification [closed]

I want to increase the armature contact time with pin 87 of any relays when coil is energized. For instance, if the initial armature contact time is 2 seconds with 87 pin, how to increase the contact ...
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2answers
57 views

Is this relay datasheet incorrect? (Omron G6SK-2)

I'm using Omron G6 series relays, both the non-latching (G6S-2) and and dual coil latching (G6SK-2) for a few PCB designs. What I didn't know was that some models of relays give their connection ...
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0answers
79 views

esp32 resets when relay switches from ON state to OFF state

When I switch a 12v relay from ON to OFF using esp32 then the ESP is restarted. Also it happens only when there is an AC load. I control 12V relay with a transistor. This is my relay How to solve ...
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1answer
31 views

Dusk dawn motor driver with polarity reversal

I'm trying to accomplish this. When a dusk dawn switch is on, drive a small DC motor for a few seconds and then stop. when the dusk dawn switch is turned back off, then turn a small DC motor THE ...
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1answer
47 views

Supplying relay board with mains voltage [closed]

I bought a relay board (this one) that can handle 10A at 250V, my question is: if I wire a mains supply into it, say from a ring circuit (that powers sockets throughout normal houses). Will the relay ...
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1answer
37 views

Diodes needed (parts) for OR gate automotive relay circuit

I need to power up a make-or-break simple automotive relay (4pin, 40A 12V) via an OR gate. OR gate as follows: Source 1 is the car dome light which I will tap into and source 2 is engine-on port ...
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2answers
27 views

Using a Relay with SMPS as load leads to contact welding after keeping energized for sometime

I am using a relay SRD-5VDC-SL-C(generic module made for diy projects) to control AC current going to my SMPS(120-300v AC to 12V, 2A DC) driving my LED strip. The relay is controlled by a Lolin ...
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1answer
59 views

What should be switching voltage rating of relay in a 380VAC 3 phase system?

I am hooking up a system where there is 2 sources of power available. One source is the grid power, and the other is a generator. The grid provides me with 3-phase 380VAC with a neutral wire; and on ...
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4answers
90 views

Is this AC circuit wired correctly? [closed]

Is the following AC cicruit wired correctly? And is it safe to plug in if i use electrical tape to cover the open connections?
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3answers
72 views

How to isolate the following relay circuit from mains?

How to isolate the following circuit from mains or safely send a 5V signal from RPi to turn the relay on? I currently have a 5V signal going into the IN pin of the relay board and RPi ground to the ...
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1answer
65 views

Control the relay using an arduino

I'm trying to make a DIY smart socket. Is it possible to control the relay with an Arduino? Maybe replace the controller with the Arduino? Can I use the ribbon cable Out, Ground and VCC pins do to ...