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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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12 V relay buzzing/fast clicking sound when getting signal from Arduino UNO

I'm new to electronics but I decided I want to try and build a simple circuit to control with my Adruino UNO R3. I want to make a relay switch on and off programmatically with my UNO. Here is my ...
Think_Twice's user avatar
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3 answers
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driving 24V relay from 3.3V controller

I’m trying to actuate relays using a 3.3V microcontroller. To do this, I used an optocoupler to translate the signal from 3.3V to 24V, while also providing optical isolation. When I send a HIGH ...
priya's user avatar
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Esp32 controls a 12v coil relay through PC817 and 2N7000

I need to control a 12v relay with an Arduino nano ESP32. Can somebody check if the circuit I designed is good? Components list: MOSFET: 2N7000 (N-channel); Optocoupler: PC817; Diode: 1N4007; Relay: ...
PaoloRos's user avatar
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3 answers
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Troubleshooting and understanding single coil latching relay circuit

I'm working on a project involving single coil latching relays (specifically the JQC-3FF-S-Z relay modules), and I'm encountering some issues with maintaining the relay state when power is ...
RobbB's user avatar
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Why does the STM32F030 hang when the solenoid Lock is activated?

The circuit consists of a STM32F030 and several 5 V relays, which are connected to the coil to open the door. The input voltage is from 18 V which is fed from a 220 to 18 V transformer (not switching ...
sn01's user avatar
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1 answer
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Automotive 12 V relay setup with push button switch and multiple devices

Need help with a 12 V Automotive application project. 2 electric motors 1 electric latch/lock assembly 2 push button switch I built a custom storage compartment with electric motor to automatically ...
A B's user avatar
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0 votes
1 answer
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ULx200x V.S. SN7546x

I would like some help understanding the difference between these two Darlington transistor arrays, and which one may be a better fit for my application. I have a 5 VDC 500 mA max. PSU powering an ...
Austin Fox's user avatar
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Relay controlling DC motor welding shut

I am controlling a fairly large DC motor using a relay. The motor draws approximately 7A at 36V. I am controlling it with a relay rated at 110VDC, 50A. To protect against back-EMF, I placed a ...
J.P.'s user avatar
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1 vote
0 answers
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Can I control 2 circuits with a single on/off switch? [closed]

I have a maintained contact pushbutton (on/off states) which should be used to control two light circuits, the low and the high beam circuits. Is it possible to build such a (SP3T) switch using relays ...
JohnnyBoy's user avatar
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2 answers
102 views

Is it possible to use just two SPDT relays to control this AC motor?

I purchased an inexpensive electric hoist off Amazon with the intention of partially replacing its control circuits so that it can controlled via ESPhome. There are only 2 buttons on the control box. ...
My other car is a cadr's user avatar
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1 answer
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Arduino and Pololu Motor Driver Shield Undervoltage Issue When Driving Relay and Motor Pump

Problem: Arduino Relay Shuts Off When Motor Driver Turns on to Actuate Motor/Pump. Hello! This is my first post, so pardon if my question lacks structure or etiquette. I will try to provide as much ...
Nathan Nguyen's user avatar
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2 answers
105 views

Why is the Relay "Chattering"?

I have this circuit which measures if there is under/over voltage from the AC mains voltage and it consist of two parts: Part one: measuring the input voltage (I had it cropped because it is not the ...
Hazardous Voltage's user avatar
0 votes
4 answers
46 views

Use of TX/RX on Wemos Relay Shield

I am using this relay shield in a project and I am curious of the use of the TX/RX pins for this component. There are quite a few pins on this shield when D1 is all that's needed to trigger the latch....
aaries's user avatar
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1 answer
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Driving a power relay using a MOSFET, Raspberry 4b, and a buck converter

I am trying to use my Raspberry Pi 4b GPIO pins to control a power relay through a MOSFET. Power relay: https://www.digikey.com/en/products/detail/cui-devices/PR23-5V-900-1A/16752646 MOSFET: https://...
rian1's user avatar
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1 vote
1 answer
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Circuit design for a timer and relay

I'm designing a timer circuit that detects white cards with black stripes, which needs to be inserted in a specific position to activate. The black stripe sensor must remain disabled when the card is ...
John Madureira's user avatar
2 votes
2 answers
135 views

Wiring basics for timer relay

I'm not an engineer or electrician, but trying to figure out how I can make this timer relay work for my project. Or figure out if there's a different timer relay better suited to the job. The relay ...
pilibeen's user avatar
1 vote
1 answer
81 views

Arduino can not drive a BJT connected to a relay

I'm trying to make a simple 24V relay driven by an Arduino Leonardo as per the following picture: The Arduino code simply toggles the output every 2 seconds. When I measured the pin voltage alone, ...
hrsk2002's user avatar
0 votes
3 answers
84 views

Car button - Switch current impulse to relay

I will add momentary push button to car infotainment panel (instead of blank). It's VW/Audi original button which I want to use to switch relay (ys-rt1c - Timer delay turn off) to supply 12 V for rear ...
Jason's user avatar
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-2 votes
0 answers
38 views

DPDT relay - Energize and de-energize using control from MCU [duplicate]

I am planning to use a DPDT relay which is rated at +12 VDC. My circuit is as shown below: I am giving +13.8 V continuous voltage to pin 1 and pin 8 is connected to control signal that switches ...
sathya priya sugumar's user avatar
1 vote
0 answers
57 views

5 Pin Relay Wiring - Is this possible?

I have an Engel Fridge/Freezer in the rear of my 4WD. When driving and during short camping setups I will run it off the car battery (no issues there). However, when we go away with our caravan (...
Paul M's user avatar
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2 answers
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Powering LED's From Two Different Relays? (Complete Novice)

I am attempting to install auxiliary reverse lights in my vehicle and have come to the end of my useful knowledge. I am confident I could simply install new LED's splicing a relay into the existing ...
Wire_licker's user avatar
9 votes
2 answers
475 views

Datasheet recommends driving relay in an uncommon configuration

I am looking at the datasheet of G8G relay(s,) specifically the section where they recommend how to drive the relay and placing the reverse diode. I wonder about their statement: OMRON recommends ...
Christianidis Vasilis's user avatar
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switching 2 mosfets with 1 signal

Hi. I'm trying to switch between 2 LED with 1 GPIO and not sure if I've designed correctly. C2_CC_CTRL = GPIO i wonder when GPIO signal is "high", Q14 MOSFET = "ON", D29 LED = &...
3clocks's user avatar
2 votes
1 answer
76 views

Zero-Current-Switching Circuits

I'm basically driving an AC fan from 120V AC wall power (use of classic magnetic mechanical relay or solid-state relay is fine, but I'm weary of triacs because of their EMI and their wasted voltage ...
bobuhito's user avatar
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0 votes
1 answer
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Issues with 2-Channel Relay Songle SLA-05VDC-SL-C Stuck in NC State

I am experiencing an issue with a 2-channel 30A relay (Songle SLA-05VDC-SL-C). The relay always remains in the NC (normally closed) state and does not switch to NO (normally open), even when I try to ...
Lucas Buchalla Sesti's user avatar
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0 answers
34 views

Relay module I/O pins resistor

I'm making a project with a 12v relay module and a AC motor. The circuit is simple and doesn't need any microcontrollers. I want to control the motor using a relay and a float switch. I was hoping can ...
Kokachi's user avatar
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3 answers
68 views

Switching bistable relay with BC337 transistor

I do have two bistable relays which do the same: They are either set or reset via a GPIO pin of an ESP32 using a BC337 transistor. A BC337-16 gives me about 120-130 mA with 390R, so that is suitable. ...
Tintenfisch's user avatar
0 votes
1 answer
89 views

The LED that is series with relay is destroyed after a couple of activations

I've tried to make a bidirectional relay circuit with a pair of relays that work with 24 volts. I tested the circuit and it works fine and both LEDs turn on when the relay is activated. After a ...
hrsk2002's user avatar
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0 answers
24 views

Is this LTSpice simulation of arduino's command for relay corrrect?

Here is a LTspice simulation for based on the video Design Relay module PCB using Altium designer To me, it seems ok, but i am lacking of experiences. What is your opinion on this LTSpice simulation ...
alvaro562003's user avatar
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0 answers
86 views

Triggering a small black powder charge with an STM32

I am trying to design a flight controller system that can trigger some small low-power explosive charges as described here. The description states that the charges will ignite with as little as 2V at ...
Jark's user avatar
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12 votes
6 answers
3k views

Second opinion on PCB design for relay made in Altium

Edit: I have added the updated PCB design at the bottom over this post (for anyone curious about the progress) And a big thanks to everyone who commented, it really helped me out a lot! Original ...
Djumbonia's user avatar
  • 137
0 votes
2 answers
99 views

What is the activation power for a 240 volt dryer heater relay?

I'm fixing the heater on my Kenmore dryer. I've already confirmed continuity on the entire heating circuit (heating element, thermostats, fuses, centrifugal switch, etc) and have reduced it to the ...
Robert Rapplean's user avatar
0 votes
1 answer
51 views

Solar Array Control With Photocell

We did search on this topic before making this post, but this is as close as we found; Link to question from 2020: Solar Panel-Photocell Wiring ... which didn't seem to be closely enough related to ...
Stephen Falken's user avatar
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0 answers
26 views

ESP32 rebooting on gpio LOW

I am using esp32-wroom-32 module to turn on/off the 24v electronic solenoid valve using 5v relay. Detailed circuit is shown in the image below. However according to my observation whenever the ...
java bee's user avatar
0 votes
1 answer
35 views

Small 12v relay for motor

I wanted to make an automated motor driver with a relay module. Can I use this given relay to switch my motor. The motor is a 1/2 HP single phase centrifugal pump (240v 50hz AC). Is this given relay ...
Kokachi's user avatar
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1 vote
1 answer
46 views

Switching 600 V, 5 A with >100 megohm isolation

On our robot, we have several 1.5 kW DC motors (either <350 Vdc @ 5 A max, or <650 Vdc @ 3 A max : the PCB I'm designing should accept both options). The command logic is embedded into the ...
Sandro's user avatar
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0 votes
0 answers
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Raspberry Pi, Relay Module and 5V pump power dips / monitor flickering

I have an issue with my Raspberry Pi + Relay to control a pump. The relay module works fine and I can switch the pump on/off. However, if I switch the pump on for more than a few seconds, the monitor ...
Yusuf Khan's user avatar
0 votes
2 answers
58 views

How can I use a relay and diodes to reverse the polarity to a electromagnet?

I am trying to make a solenoid using a motor, relay, and 12-volt battery. I have everything working, but it only goes one way. I want it to reverse the polarity when the relay is open. Will it work if ...
Seymour Butz's user avatar
0 votes
1 answer
43 views

Relay not turning on a Motor

I am new to electronics. I want to reverse a motor using 2 relays but when i turn on the switch nothing changes.
Master_Arash's user avatar
0 votes
1 answer
47 views

Controlling motor with Raspberry Pi Pico and relays

I have a 12V motor which can be rotated forward or backward based on the polarity. I would like to control it with Raspberry Pi's GPIO ports. So that by switching 2 GPIO ports on Rpi I would be able ...
Martin819's user avatar
  • 101
0 votes
1 answer
69 views

Will a CAN bus signal open up a relay?

My car has CAN bus. And I want to connect the one end of a cable into the high beam light signal and the other end into pin 86 on a relay. Will the CAN bus signal that goes through this cable open up ...
Daffy Duck's user avatar
2 votes
4 answers
145 views

Exceeding a relay's safety AC rating

I was wondering if it would be a safety hazard to exceed a relay's AC rating of 125VAC with 230VAC? Will it work? Here's the data sheet. I'm using the 5V variant. Image source: Mantech Electronics - ...
Zipho Lunika's user avatar
0 votes
0 answers
50 views

Verify the correctness of a circuit: AC to DC conversion for Arduino Nano and relays

I need your opinion about the correctness of my circuit. As is shown in the drawing schematic, the circuit is supplied by 220 VAC which will be converted to 12 VDC. This output is used to supply the ...
nad66's user avatar
  • 1
1 vote
2 answers
54 views

How can I prevent a 120VAC solenoid valve from resetting my ATMEGA328?

I'm using an ATMEGA328 running Arduino code to control a relay which uses a 5V signal to switch a 120 VAC solenoid. I added a flyback diode to the relay which fixed an earlier reset problem, but I'm ...
Jake Nixon's user avatar
3 votes
2 answers
796 views

What Does the 'Cosɸ' Rating on a DC Relay Indicate?

I've purchased some DC relays from a manufacturer called "Leone". The relays are marked with "50Hz Cosɸ 1": I guess they want to imply a power factor rating? But why would a relay ...
15 Volts's user avatar
  • 707
0 votes
1 answer
18 views

2FormC relay contact: which is NO/NC

I would like to use this relay: https://www.digikey.com/en/products/detail/panasonic-electric-works/NC2EBD-DC5V/648942 Is pin 7 the common pin between pins 11 & 12? Is pins 7 & 11 NORMALLY ...
Ariel Narboada's user avatar
0 votes
1 answer
52 views

How can I determine the frequency range of the relay in the RF range without accurate data in the documentation?

Please tell me how to determine in which frequency range the relay operates, if the description for it indicates that it operates in the RF range, but the documentation does not name the exact ...
Marl0s's user avatar
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7 votes
3 answers
1k views

Removing turns from a relay coil to make it work on a lower voltage?

I have a piece of machinery that was moved from a building with 240 V to a building with 208 V and all is well but the contactors don't seem to pull in all the way. Could I remove enough turns from ...
ElectronicsNoob's user avatar
1 vote
1 answer
69 views

How can I combine two square waves to make alternating current? [closed]

I was playing with a relay and tried to make square wave generator with it. How can I improve this circuit and merge the two square waves to make alternating current? The red color in the circuit is ...
Mrinmoy Sarkar's user avatar
0 votes
0 answers
56 views

Solid state relay switch circuit with Omron G3MB-202P

could somebody explain the use of the Zener diode and capacitor in the schematic of a switch utilizing an Omron G3MB-202P?
user3788160's user avatar

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