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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12V Relay Activation
I am trying to design a DAQ with relays included activated by the PSOC [as shown below].
Relay [U11, U12, U13, U14, U15]- G5LE-14-ASI DC12
PSOC - CY8C5467AXI-LP108
EN1_12V/EN2_12V/EN3_12V/EN4_12V/...
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best way to dtop 340v dc to around 25v
so i have this crude diy led driver that has 6*680uf 400V caps in the output (im driving a large matrix of leds in series with current limiting on the led side so my board is just feeding ~310-340v ...
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2answers
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How do I turn off multiple data connections with a single switch? [closed]
I am pretty new to electronics but so I've been doing a lot of reading and whatnot. I have a question I can't seem to find any information on. I am modding a handheld device (the device in question ...
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39 views
Controlling 120v line with a 12v switch on a different line
I have 10a 120v power sockets in my garage that currently doesn't have any switch on it and powers some overhead lights that I have plugged in. Separate to that, I have a 12v circuit powering various ...
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2answers
24 views
Trace-width calculation of a relay output for a 6A device
I have almost designed a PCB and I am willing to finalize soon.
A part of it has a relay and the contacts are directly connected to a card-edge connector.
The current will be contacted is about 5A and ...
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2answers
21 views
Adjusting overload relay for single-phase motor [closed]
For an overload relay on a magnetic starter, what should the overload current be set at? I'm not sure whether this should be set to the rated running current of the motor, or an approximation of the ...
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2answers
46 views
How do I know what relay I should use
I am a Computer Science student so this is not quite my area of knowledge but I have tried to find as much information as I could.
I am creating a project using an Arduino and an electromagnetic door ...
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2answers
46 views
Invert polarity with DPDT relay
I'm trying to wire a 12v DC motor to a DPDT switch so I can control the spin direction (by inverting the polarity) it uses two digital pins, one of them to set the direction of the motor and another ...
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41 views
Controlling a RTD34005 with 5V
I am trying to build this circuit
The N-MOSFET(FQP30N06L) is controlled via an Arduino Mega and sourcing the 5V from the Mega as well.
I have tested that the leg is getting 5V across but when I add ...
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1answer
33 views
Off delay timing function for a relay, using a Arduino [closed]
Heres my following circuit: https://imgur.com/a/qTV8zgR
Here's the timing function I want to implement; https://www.google.com/search?q=off+delay&client=opera&hs=bme&sxsrf=...
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1answer
74 views
How do I slowly short pins 2 and 3 of a phantom powered mic signal?
Shorting pins 2 and 3 of a microphone signal will mute it and is acceptable for when phantom power is present. I can do this with a regular switch, or a solid state relay. But is there a simple way to ...
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1answer
26 views
Raspberry PI zero w + Relay HL-56S v1.0 [closed]
I have been working in some homemade raspberry project, using node.js to control a relay for some lamps.
I am using:
raspbery PI Zero W
6 channel relay HL-56S v1.0 (https://www.ptrobotics.com/...
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2answers
44 views
Controlling AC motor with relay vs. switch on motor
Is there a difference in terms of operation between switching a relay connected to mains for an AC motor versus opening/closing a switch on the motor? Would the internal protection circuitry ...
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1answer
44 views
Relay H-bridge current paths
I have created a circuit that can basically make a motor run in both directions using an on-off-on SPDT rocker switch and two relays.
Here is the circuit.
The catch is that this motor is 30 A at 12 V....
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1answer
31 views
Advice for Switching High Current Motor (Relay vs. SSR vs. Mechanical Switch)
I'm working on automating an irrigation system which has a large well pump that uses 24-32 volts, directly from a solar array. This was previously switched by a light switch manually, but after my ...
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24 views
Starter for Sump Pump
I'm trying to determine proper circuitry for starting a sump pump, but am unsure of what components I need. Originally was going to just use a relay, but have read suggestions for contactor+overload ...
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1answer
69 views
Which is worse for a relay? High inrush current or large voltage difference between the relay contact and the signal being switched
simulate this circuit – Schematic created using CircuitLab
I am working with a high voltage relay (Cynergy3, DBT72410) to discharge a 70 uF capacitor charged to 4 kV using a string of resistors ...
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1answer
76 views
How to wire this relay to Raspberry Pi?
I got this relay to make an IoT lamp but I can't decipher the labelling on it. There is no labelled GND, VCC, or JD-VDD just 'L' and 'H'. I wired 'IN' to an I/O pin, GND to GND, and the jumpered pin ...
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2answers
264 views
Problem connecting transistor, flybackdiode and relay
I am a new person with tinkering electronics as I am from Computer Engineering.
I am working on a project with arduino that consists of a relay, I researched from the internet and found out that a ...
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1answer
70 views
Trying to design a switchable LED circuit with no experience or skill - please send help - PART 2: I set a transistor on fire, please send more help [closed]
following on from my previous question:
Trying to design a switchable LED circuit with no experience or skill - please send help
I have an update - a mix of good and bad news...
Good news is the LEDs ...
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1answer
77 views
Substituting resistors with capacitors in an AC mains circuit
I have 2-gang touch wall switches that I want to make Wi-Fi-controlled. I'm intending to use Wi-Fi-enabled relays connected to the switches so that the switch outputs are connected to the relay switch ...
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38 views
On/Off latching circuit with a raspberry GPIO 3.3v
I'm currently failing solving my problem. Of course if I would good better in electronic, I would not post my question here but that's life, and any help would be appreciate.
Context:
I have around 50 ...
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1answer
52 views
Switch “On”/“Off” RS485 data lines
i'm doing some researches about how to close/open RS485 data line in my RS485 multi device bus.
I'm following this nice research-document: Link Here.
Basically i'm thinking how to solve this problem ...
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1answer
68 views
Is a solid state relay with over 1 MHz driving frequency physically possible?
I could only find one question semi-relatable to mine on SE, but I have a more demanding application in mind. I have designed a 32 stage 40 VAC -> 1000 VDC Cockroft-Walton voltage multiplier which ...
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29 views
Switching load with changing polarity
From a bespoke board I'm receiving 18vdc that I need to switch. This 18vdc will usually be +18vdc but at times can be -18vdc. The load is .35A. The polarity is being changed via a H-Bridge and ...
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1answer
41 views
Power output only when mains power cut and only bu ups
I have a ups in my home.I want to install a fan in my room which run only when the mains power supply is cut and ups is supplying the power.How can I do this.
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27 views
Latching relay for audio switching
Previously I have switched line level audio using a Zettler AZ850P2 relay (Bistable Latching DPDT 5V 2-Coil, 1A). Currently, I am planning a somewhat more complex soulution allowing switching audio/...
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1answer
59 views
I want to add more time to this relay delay
The maximum is 3 seconds, I want it to be 5 minutes or even 10 minutes if possible.
What should I do in terms of changing capacitors or resistors etc?
Thamk you.
I tried to reverse engineer it,This is ...
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4answers
3k views
Relay pins too close on PCB by design?
I'm designing an intermittent wiper motor controller to be fitted on a classic car.
As I'm selecting components, I came around this relay that seems to be fitting my needs (PCB mount, automotive, high ...
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1answer
197 views
How to properly use a relay module with JD-VCC from Arduino/Raspberry?
I got two 4-relay-modules and I am probably doing something wrong because none of them seems to work:
My first try was using a breadboard 5v power supply, connecting VCC and In1 to 5V and GND to GND. ...
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1answer
19 views
Esp8266 node mcu and 5v relay powering issue
i am really frustrated and worried as my problem is unsolved. I am using an esp8266 nodemcu and a 4 channel 5v relay. When i power both with external 5v 2 amps supply it doesn't work, on the other ...
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1answer
32 views
Relays for switching circuilation pumps
I have a board populated with Omron relays (G5Q-1A4-EU DC5) and I want to use them to switch circulation pumps (https://imp-pumps.com/pumps/ghn/). Is the previous relay appropriate to be used with ...
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1answer
51 views
Confirming DC circuit configuration
I am in a research team. We are designing a circuit system for powering a DC motor with battery and super capacitor. The battery and super capacitor power the motor separately and the motor gives ...
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1answer
34 views
Controlling 3V3 relay from 2V8 (VL53L1X) GPIO output with PNP transistor
I need high side switch for 3V relay (exactly RM40-3021-85-1003 with 45ohm coil -> need ~65mA). I have multiple VL53L1X (ST's ToF distance sensor, 2V8 logic levels) connected with theirs OC GPIO ...
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32 views
Relay from door sensor to laptop usb port?
I want the opening of the front door to launch a script on my laptop. I looked around on the internet and only found relays that allow you to send commands to external devices such as alarms and ...
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1answer
45 views
What protective device can be used to avoid no-load operation in a dc series motor? [closed]
I think there must be some relay or converter which automatically shuts the machine on no load condition.
( Just Guessing )
The following para is a quora answer which I am not sure is correct, please ...
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26 views
Is there any limit of how many commands it can be sent to modbus controller relay?
I have modbus controlled relay hooked to raspberry pi (using node-red) which depending on the condition sends "on" or "off" command every 5 seconds (24h/365d). I know that relays in general have its ...
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2answers
46 views
Relay for 3 phase equipment
First of all - I am just reading up and will not perform any real life installations! ;-)
If you have some 400V 3 phase equipment (e.g. a 3 phase motor), what is the practice for controlling the ...
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1answer
49 views
What is the purpose of these coils in contactor auxiliary contacts?
Can someone please tell me what the function of this module, and more specifically, the curley wires on top of this contactor? It looks like the wires go to the same terminals as the main contactor ...
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2answers
64 views
Controlling low DC voltage with high AC voltage
I replaced my existing manual roller blind switches with Wi-Fi-enabled touch ones and I'm facing an issue with properly fitting them in my setup.
The manual roller blind switches operated on 16 VDC ...
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2answers
82 views
How to supply power to multiple components?
I'm quite inexperienced with any kind of electrical work and am currently putting together a set of (minimum 6) 12v solenoid locks to be controlled by a Raspberry Pi 4. So far, I have the Pi sending ...
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1answer
42 views
delay relay on/off
I have a mechanism that starts when signal is sent from a sensor. For safety reasons, I would like a delay between the mechanism can fire again.
Pseudocode of it:
...
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1answer
58 views
Control 5V relay board with Raspberry PI GPIO
I would like to control one of these 8-relay boards with my RPI GPIOs.
Please check the below schematic - it shows the parts involved for one of the 8 relays.
JD-VCC is connected to 5V of the RPI, ...
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1answer
58 views
12V Pulse circuit to operate a double coil latching relay uses no power unless switching
I have this double coil latching relay and I need a circuit that will provide a pulse to switch it on.
After doing the pulse I don't want it to use any power.
There are two sides to the circuit, ...
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0answers
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esp8266-01 problem
Hy,
Can you help me with a problem. I build on breadbord circuit from atached scheme. If connect power supply the relay activate wichout send commend to esp8266. If dissconnect power supply and remove ...
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1answer
110 views
Universal Relay Snubber Circuit
I am trying to design the usual remote-controlled relay board for mains usage (I live in Europe, so that means 230VAC). I need to tackle the usual problem of the switching of the relays hanging/...
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3answers
69 views
Is ther a standard circuit/component to control the temperature 500W resistive heating element from a PCB?
I have a 500W (230V) cartridge heater element and a K-type thermocouple. I want to use the feedback from the thermocouple to be able to vary the temperature of the cartridge heater. I have no concerns ...
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3answers
98 views
Capacitor does not hold charge when switching power
I'm trying to create a power source switch using a relay. This's supposedly will be used for my Raspberry Pi. So what I want to do here is :
Create a backup power source with battery that will ...
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1answer
66 views
Do I need to put a resistor in series with relay coil?
I need to design a circuit to drive a relay and I have some doubts.
Do I need a resistor in series with relay coil, I mean, between
transistor and relay coil ?
Why I always find relays with 12V, ...
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1answer
102 views
What type of capacitor do i need for this delay?
I installed a set of LED RGB foot-well lights on my truck.
When they turned on, they have a small half second glitch before staying constant.
I believe that this is because the LED RGB controller ...
