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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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Trouble turning on relay using PNP transistor

I am having problems turning on this relay: https://omronfs.omron.com/en_US/ecb/products/pdf/en-g6qe.pdf Using a transistor whose base is connected to a digital signal of an Arduino Nano. The ...
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29 views

Relay for high current DC power (Led strip)

i'm going to make a relay circuit for led strip which have 650 watt 12VDC, so it's about 60A. i've search some forum said to use BJT or MOSFET, so i've search the component on my country and found ...
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Can I use a current divider to protect my IC?

I designed an oscillator circuit using a TLC555 timer IC to create a 2 second pulse, which is used to drive a 12V 6W solenoid via a relay. Both the IC and the solenoid are run off of 12V, but every ...
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29 views

Relay circuit for AC 70 watt

I'm going to make relay circuit for AC 70 watt, 220V based on SSR in this link I'm little confused for the R8 in my schematic, which data should I look on my TRIAC datasheet? (I will be using Z0607 ...
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47 views

Make ground signal last longer?

I'm trying to figure out a way to make a ground signal last longer on my car. I'll explain what is happening and what needs to be done. I'm hooking up an factory alarm on my car. It uses a negative ...
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53 views

Correct replacement relay for obsolete part? [on hold]

I'm not an EE, but I've replaced parts (through-hole components) to fix other items like my PC monitor (PSU capacitors). I'm not afraid to replace exact match items, but when it comes to non-matches I ...
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77 views

Can I use this relay?

I got this relay. In the product description they say: "belastet bis zu 10 Amp/250 VAC, 5 Amp 30 VDC." which means: "charged up to 10 amp / 250 VAC, 30 VDC 5 Amp". On the relay it is printed: 10A/...
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37 views

How much current does the Eltako ER12-001 need to switch the output?

The Eltako ER12-001 seems to be an interesting relay. It has an integrated electronic circuit to operate a bistable relay, while acting like a normal one. The control current can be either AC or DC, ...
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74 views

Relay Sometimes Not Switching

I have a question about relays used by an arduino. I know how to wire them and they work fine for the most of the time. But sometimes the relays doesn't correctly switch on or off. I can clearly see ...
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64 views

Integrate residential hardwired alarm zone with modern wireless sensor

I have an old alarm system in my house that I would like to integrate with a modern system. The old system has hardwired circuits where multiple reed sensors in series monitor a zone with as many ...
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3answers
74 views

How to replace relay with N-Channel Mosfet

I have this simple circuit which uses a relay to charge and discharge a capacitor. Now instead of a mechanical switch, I want to use an electronic switch such as a N-Channel Mosfet. How can I ...
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29 views

Switching between two connections - adding LEDs to car reversing light circuit

I am doing a DIY project on my car and need some help. I have 2 LED COB on the back of the car, which is to be used for 2 different things: If I put the car into reverse gear, then the LED comes on ...
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96 views

Can a relay be switched continuously? [duplicate]

I would try to make it as clear as possible. I have a relay, and it has five pins( NC, NO, C, and coil) like any basic relay. Now, I want to apply a logic - when the input (I would say it BMS from ...
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57 views

Sequentially driving multiple stepper motors with 1 driver and 1 controller

I am trying to control multiple stepper motors sequentially (only one at a time) with one controller, one driver a multiplexer and a dedicated "relay" circuit (shown in red). The idea is instead of ...
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39 views

Circuit turn on delay question

Check schematic below, On power on, I want to create a delay when the relay turns on of about 20 seconds. Once its on, it stays on until the power is cut. Timing accuracy is not important. Now I could ...
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76 views

how to switch off multiple power source (+5/+12/3.3) in the same pcb

I'm designing a PCB that receives 3 power inputs 3.3v, 5v and 12v. I need simple way to switch all of them of in one go. Here is a schematic of my PCB I looked into using a relay but all the types I ...
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83 views

I2C Relay Circuit shorting & sparking

I'm having trouble diagnosing a faulty circuit. Here's the schematic, which is based on this instructables build. This is part of a bigger circuit, but I have tested it in isolation on a fresh board. ...
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41 views

Relay type identification

I have this relay from an old clock. I wanted to replace it but I can not find any replacement because I can't identify the relay type, it seems to be an odd long armature relay. Tried everything on ...
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108 views

Controlling high voltage devices with Arduino Relay module

Goal: I want to build a circuit that converts 700V DC supply to 700V pulses of 15ms duration. From what I have learnt from online, is that Arduino controller can be used with Relay module to control ...
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22 views

Multiple channel relay

Can I switch relays on 8 channel relay model separately. Like theres 8 relays on the board, do they all switch together when powered or can I use them separately?
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2answers
76 views

Increasing current in an Arduino circuit?

I'm trying to power a small electromagnet using my Arduino Uno, but when I use the 5V pin, the current flow is not enough and the electromagnet ends up being a lot weaker than it is with a regular 1....
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67 views

Operating relay above coil voltage

I want to power some accessories in my car using illuminated switches on the dashboard. These switches will be wired to the dash illumination circuit, which is normally 12V but can drop as low as 6V ...
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29 views

The differential protection relay

The differential protection relay may lose its stability through fault due to the saturation of a CT magnetic circuit during a short circuit condition. To overcome this, which type of relay should be ...
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1answer
57 views

What is the difference between optoisolator and motor driver?

Suppose we need to control power of a device (12v, 500mA). I tried to use TLP281 board, which works, except that it inverts the output: device is powered when there is no control signal. For this ...
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31 views

Motor controlled with a solid state relay not starting

We have a solid state relay controlled by a Raspberry Pi, The relay is interposed o the negative wire between a 11-12V battery and a motor. If I measure the voltage before entering the relay, it is ...
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30 views

NodeMCU 12E: Using 8 Digital pins 8 Channel Relay

I am trying to connect my 8 Channel Relay to my NodeMCU 12E and use it for automation with Alexa. For digital output I am using the ports: D0,D1,D2,D4,D5,D6,D7,D8 And for power: Relay(VCC) -> ...
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42 views

Connecting a space heater through an Arduino-controlled relay

I'm considering connecting a space heater to a relay such as this: http://www.handsontec.com/dataspecs/2Ch-relay.pdf The goal is to control it remotely using a GSM data connection. The relay is ...
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1answer
61 views

Relay - must drop-out voltage

simulate this circuit – Schematic created using CircuitLab I have an output that can operate a relay at 12V but the drop out voltage is 6V. So the relay never drops out once pulled in at 12V, ...
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28 views

10A 5v Relay control Submersible (Water motor)

Is it possible to control Submersible (Water motor) with 5v 10A relay. Here is the details of the Submersible water motor. My mains voltage is 225V to 250V If this won't work then what relay should ...
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1answer
42 views

The relay controller circuit in a pre-amp stopped working properly

I have a pre-amp with a controller circuit which controls input signal micro-relays and a power supply relay. While the input signal micro-relays work normally, all of a sudden the 30 second delay for ...
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47 views

Advice for PCB layout 230V AC to 18V DC with another function (beginner continued)

I am continuing a thread Beginner's second PCB circuit design: AC to DC Does this PCB design look better than the previous and do you understand it? I also want to know if the terminal blocks ...
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7answers
155 views

3 momentary buttons controlling 3 relays

I have an automotive 12V project that has 3 momentary push buttons and they all have to operate individual relays. (3-4A) The problem is I need only 1 relay to be active at a time while toggling ...
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Can I use a 28 VDC 10 A relay to toggle a 10 kV DC 0.03 A source?

Neon signs use transformers that can output at 10 kV DC at 30 mA = 300 W. I want to toggle this power with a common 5 V relay, but the DC rating for these are about 28 V DC at 10 A = 280 W. Does the ...
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36 views

Drive a relay using V < nominal V

I’m trying to use this circuit: falstad simulator To drive a relay with the following specs: Nominal voltage: 12V DV Coil resistance: 960ohm Must Operate Voltage: 8.5V DC Nominal Power: 150mW So ...
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1answer
30 views

Digital voltage stabilizer relay diagram

I am using this voltage stabilizer relay diagram below, which provides a 16 step-up level. I need to edit it, so that I can made it to work as step-down in case of high voltages such as 245 and above. ...
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2answers
81 views

The Blue LED of ESP8266 glows continuously when connected to 5V relay output

I am a newbie. Need help on my project. I am building a project which controls a 5V relay from ESP8266 ESP-01. Since the GPIO2 gives the output of 3.3V, I am using an N channel MOSFET 2N7000 to ...
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34 views

Thermistor motor protection relay for thermal protection

In some of my induction motors PTC thermistor is available for thermal protection which will be integrated to thermistor motor protection relay. There are three PTC thermistors connected in series in ...
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39 views

Driving 60v switch with 3.3v (800ma max)?

I'm relatively new to working on hardware projects, albeit I have years and years of software experience. I've started retrofitting an electric bike I have to make it "smart". It uses a 60v battery ...
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1answer
50 views

Choosing the right (flyback) diode to stop contacts (points) arcing (sparking) on solenoid (relay)

Clock with a simple electric remontoire, consisting of a solenoid, with an arm, that kicks back the main spring, rewinding it. Solenoid coil data: operating voltage: 12V-15V measured resistance: ...
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1answer
115 views

Please help me understand this bjt set up works

This is part of an automotive timer (NOT a 555!) that we have at work. Because I'm extremely bored I'm challenging myself to understand how this one operates. I've spent about 1.5 weeks with tutorials,...
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39 views

Protecting malfunctions in relays which operate roller shutters (motor, inductive load)

I have a circuit used to control roller shutters in my home, which roughly can be seen in the schematic below. simulate this circuit – Schematic created using CircuitLab It works, but after ...
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1answer
28 views

Struggling to limit current

In short I'm building a relay controller and want to limit the current going to specific relays. My power source is 12V DC @ 20A. For one relay I want to limit the current to 10A and another to 2.5A....
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29 views

How to run 200 RPM motor on 5V Relay using NodeMCU?

The following circuit comprises of NodeMCU (ESP8266) which is intended to run a 200 RPM johnson motor. The circuit comprises of 5V Relay connected via Darlington pair using transistors. The circuit is ...
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83 views

Design temperature for an electrical control panel?

I am putting together an electrical control panel composed of small VFDs (like Siemens micromaster 440), PLC AB 1400 B etc, contactors, relays etc. What temperature and humidity should I design the ...
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1answer
38 views

max. switching power of relay in datasheet

I want to use SPST relay to control resistive load as well as inductive load i.e. ceiling Fan (Load<150W). I used the 5VDC relay (HF46F-G) which is capable of 7A current, 250VAC. Datasheet: http:...
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1answer
90 views

Switching relay on and off affects analog sensor output voltage

I am working on an AVR project that involves measuring tempereture with an analog sensor (TMP36) and switching a heater on and off through relay to keep the temperature at desired level. However, I'...
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64 views

How to wire 220v to 1 ch relay

I bought the following 1 ch relay - Link (433 MHz), which is just like the one in this video - Link. I want to connect it to my room lightbulb which uses 220v, the thing is I'm not sure how to wire ...
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5answers
157 views

Using Relay Module

Can I use a relay module to switch on & off a door alarm (1.5 V × 3)? Basically, can a relay switch work in this low DC power? Also, I'm trying to make an alarm system which emits high noise when ...
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1answer
32 views

Soft-power on/off with ATMega/Relay causes brown-outs and unexpected voltages

This questions consists of two parts. Background I'm designing a digitally controller class D amplifier. Main IC's are a TI TPA3116D2 Class D amplifier, a TI PGA2311 volume control and an ...
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3answers
119 views

Switching 240VAC 1A max from 5VDC

I'm planning a device that can switch a 240VAC 1A current - most likely 0.5A but it's nice to have the head room. A relay seems the most obvious choice but given the low current it seems over the top ...