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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21 views
Sub woofer class-d amplifier relay keeps switching
My mordaunt short ms309w sub woofer has developed some faults recently.
Firstly, it has 3 states - on, off and auto. The auto state automatically turns on the unit if a signal is detected. This is ...
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1answer
48 views
RTC Power Switch for Raspberry Pi
I have done a lot of research on how to design a circuit to cut power from the pi after a safe shutdown and then turn it back on at a certain time. I am using a DS3231 RTC with an active low ALARM pin ...
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1answer
35 views
What's the name of a timeout relay which won't re-trigger if it times out?
I would like to replace the relay which triggers a water pump, with a relay which times out after, say, 10 minutes. And if it times out, it stays locked out until reset.
Needs to be 230v AC on both ...
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0answers
19 views
How to Measure Switch State with Current Sensor
I have a motor attached to a relay board with an INA 219 between the board and motor.
I would like to engage the relay and turn on the motor, and then flip the motor off when the switch changes state....
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1answer
117 views
Switch on a 10 A circuit with only a 20 mA signal
I'm attempting to wire in a 12 V fan to my car that draws 7 A at full speed. The fan is a fused link directly to the battery. I have a 12 V 20 mA signal wire, but that doesn't appear to be strong ...
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2answers
44 views
How to wire a relay for DRL/blinker?
I am currently working on some improvements on my motorbike, and one of them requires something I have never done before.
I am adding 2 12v LED strips (well, they're built in a piece I am mounting, ...
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3answers
47 views
Can I use a Step-up Power Converter with Arduino instead of a Relay?
I want to make two projects that use a 12v input, a solenoid valve and a electrical lock. Both need a 12v current to work. I've seen some exemples for both projects that use a relay and an Arduino to ...
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2answers
322 views
Why is the Active/Real Power Rating So Low for This Relay?
I'm trying to select a relay for a IoT project that will control a water boiler.
I took a look at the HF32F-G relay, but some of the specifications in the datasheet weren't making any sense to me.
...
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0answers
22 views
Powering on ESC causes backfeeding on PWM line
This question is on behalf of the robotics team I am a part of.
Our robot's electrical system has been working great. However, we noticed that once in a while our Teensy or Raspberry PI would crash ...
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1answer
22 views
triggering a solenoid valve from batteries charged by hydroelectric system
I'm providing a slow-closing solenoid valve for a hydroelectric system in a village in the Philippines. I need to have the normally closed valve activated to open when the batteries are drained to a ...
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0answers
24 views
How to accurately measure battery chargers' in-rush current
I am using 2x RS3 Dualpro chargers in parallel for charging my batteries as seen below.
RS3 Specs:
AC Input: 100-240VAC 50/60 Hz 6.0 amps (Max)
DC Output: 18 amps (Max) DC @ 12 Volts
I have used ...
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1answer
58 views
Bidirectional Logic Translator translates to 2.8V instead of ~5
Considering the below PCB with the following scheme, with components inserted,
with DC+ connected to a relay's DC+, DC- to DC-.
When CH1 is connected to the relay, the voltage between HV1 and HGND is ...
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2answers
40 views
How to find maximum coil current for relay based on nominal current value given in datasheet
As per datasheet for Relay (Panasonic: JS-M Series); all nominal values are mentioned for coil current, voltage & power dissipation. Based on these values how to estimate maximum values for ...
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1answer
85 views
Why is Zener reverse based on relay circuit?
In a common relay circuit a zener diode, or other diode, is used to shunt the spiked that the relay could cause.
Now, why is the zener's cathode connected to the battery (or other source)'s positive ...
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3answers
2k views
Is “humming” normal in an AC relay?
I have a 240V relay that uses a 120VAC coil. When I switch power to the coil, the relay makes a faint humming sound. It isn't very loud, and sounds like a transformer almost. A normal speaking ...
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3answers
40 views
Can I connect DC12v on VAC output (2A 100-240V) relay?
Solid State Relay G3MB
This relay's output says "2 A at 100 to 240 VAC". If I wanted to connect something like DC12v 2A to this relay output,
It is not going work?
It might work, but it will ...
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0answers
75 views
How to provide mains supply to multiple devices from a single mains power supply?
I am designing a Fire control system where I have access to a single mains supply switch outlet. However, I need to supply the mains voltage to different devices, like multiple relays, my ...
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2answers
98 views
Using Diodes instead of a Relay
While working on a switching setup for a automotive cooling fan, I came up with a question. Can diodes be used instead of a relay when dealing with two switching sources? The main source would be the ...
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1answer
33 views
How to spec out a relay correctly
I have a load that I am trying to switch with a relay. The load to the relay is an autotransformer. The wiper output of the autotransformer is (2) 120:30 step down transformers with each having 150W ...
0
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1answer
56 views
MOSFET vs. relay power efficiency
Newbie question here. I am putting together a remote switching box for power circuits aboard a yacht. The design is for a central Raspberry pi to send orders to a few boxes, each controlling a number ...
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0answers
36 views
battery life estimation for a RF relay
For now I'm using this RF relay with a 12V DC adapter but I'm thinking to power it with a battery.
The remote control of the relay already uses a 12V battery. My assumption is that the receiver ...
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2answers
52 views
Relay switching a light causes a spike, making a raspberry pi halt
The problem in short:
I worry that switching lights is causing a spike. Occasionally a Raspberry Pi halts completely after a relay is switched.
The setup:
A Raspberry Pi 3 is connected to an ...
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2answers
62 views
Wiring for a 12V AC relay module?
I'm currently trying to automate my intercom system. My overall aim is to have it so that I can both detect when the buzzer has been pressed and then also to have it so I can open the door. I am using ...
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2answers
52 views
Can DC voltage on a DC relay switch an AC circuit?
Can I use a DC relay with 5VDC to switch a 120V highpowered circuit?
Thanks
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3answers
44 views
relay coil voltage: can I have trigger with both 110v and 240v?
I'm searching for a relay that can both trigger and switch on either 110v or 240v. To clarify - both the coil voltage and the switched power would be the same voltage - and as low as 110v or as high ...
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2answers
94 views
How to control 12V from 5V using transistor? [duplicate]
i have used BC547 Transistor to stepup from 4.6v but I can't able to draw above 5v from collector, I have given input of 4.6v to base and emitter to ground and collector to output load. but load doesn'...
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0answers
41 views
How much current does an LED in optocoupler draw?
I am planning to actuate the relay (opto-isolated) using the GPIO pins of Nodemcu. NodeMcu's datasheet says that maximum current that can be drawn out of a GPIO pin is 12 mA. Any load more that may ...
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2answers
50 views
Switching Regulator Voltage Dropping Unexpectedly
I am trying to determine what exactly is causing the below switching regulator/ DC-DC converter module to not maintain its rated output voltage.
http://www.meanwellusa.com/productPdf.aspx?i=794
I am ...
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0answers
16 views
2FORMC DPDT Relay gets stuck in middle
I'm trying to charge 3 batteries via 2xRS3s in parallel for charging the 12V batteries.
I got in touch with manufacturer and said that they work well in parallel.
The issue is, after couple times of ...
0
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0answers
43 views
Suggestions for switching 800VDC converter on/off
I'm stress testing(turning them on-off with load every 300 seconds for 1-2 weeks) the components that we are willing to use. have tested several battery chargers with AC input with using a timer relay ...
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1answer
91 views
Why am I receiving no voltage to my load in this circuit? [closed]
Please pardon the gap in my knowledge relating to proper electrical terms.
I have been converting my car to use dual electric fans and removing the stock mechanical fan.
The fans that I installed ...
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vote
2answers
85 views
Soldering alternatives for a relay [closed]
I have to confess that I'm not a handy person thus soldering is too difficult for me. I was researching on the internet about soldering alternatives but all of them are done for soldering 2 cables.
I ...
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2answers
63 views
Make a one-way switch with a BJT or relay?
I've been trying to figure out how to make a one-way switch with some analogue electronics.
i.e.: my first idea was to use a BJT. What I'm trying to find is a design that when the base current is ...
0
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1answer
72 views
How to build a relay switch that resets when power goes out?
I'm trying to build a kill switch in my car so that when I turn the ignition, a button also has to be held down. When the power goes through, the button can be let go and the system stays closed until ...
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0answers
43 views
Replacing two corresponding switches as one with logic gates, to supply power, around a DPDT relay
This is one section of a project I'm working on. A user can choose between DPDT functionality (so having "DeviceI" be a motor that goes forward and reverse) or the alternative option to add another ...
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1answer
53 views
mosfet circuit without get supply mosfet on, why? [closed]
in ckt i not give gate supply and vd=12v than vs=12v
in this condition mosfet not work as switch. why this?
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3answers
166 views
Why are my relays dying?
I am using a SainSmart 5V 2-Channel Relay Module for Arduino to drive a hot plate (110V, 1000W).
I plugged my Arduino VCC and GND to the VCC and GND pins of the relay board and I drive both relays ...
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2answers
59 views
Is a relay stressed by a partial activation of the trigger?
I'm using a relay like the one in the picture, controlled by an Arduino.
I basically use it for turning mechanically on/off a circuit, when i have 0 as constant output from a series of values that ...
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2answers
52 views
Can I switch two 12v sources with 5 pin relay?
I'm installing a stereo in an RV and would like to maintain default behavior of having the stereo receive power on vehicle accessory power/ignition, but also be controlled by a switch in the RV for ...
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0answers
25 views
How to wire latching SPDT relay using proximity switches
I was asking a question in a discussion and was told that I was opening up a new discussion and that went against Q&A forum...
So I am asking here...
You can see the original discussion here: ...
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0answers
20 views
PANASONIC AHES4191 sticks on High Voltage upon “contact”
I am designing a relay box which has a basic function of just "cutting" the Line and Neutral line coming from AC Source...
R = stands for the relay (DC controlled)
Rs = stands for shunt resistor (for ...
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2answers
98 views
How to wire latching SPDT relay using proximity switches without relay hanging
I have a hydraulic-driven piston pump that I designed and built.
I need a way for the pump to automaticlly go up and down.
I wired it using a SPDT relay and a 3 wire PNP NC (normally closed) and ...
0
votes
2answers
80 views
Implement 7 DPDT-switches with Arduino [closed]
OK, so my problem is the following:
I have a commercial box with mechanical DPDT-switches for controlling valves by changing the polarity of 2 wires per valve. The box has 7 relevant switches, which I ...
6
votes
4answers
722 views
Causes for a burned up flyback diode on a relay?
I'm repairing a control board for a premium washing machine (model #s at bottom for anyone that's interested). The machine was displaying an error code for relay failure. I took the board out of ...
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1answer
79 views
Controlling a high voltage relay by a PC USB
My 2.1 speaker's transformer is consuming active power even when the PC is off. I know it because it is always warm. Thus, I want that only when my PC is operating the transformer will get the AC ...
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1answer
27 views
can SPDT relays replace SPST switch? Or does it depend on the particular implementation of the relay?
I am working on SKU consolidation and my concern right now is if I have a cheaper option of SPDT switch with all the ratings same as SPST switch which is currently used. Can I replace it? Or does it ...
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1answer
69 views
How A/C board works on an air conditioner
I have a question.
I got a Panasonic CU-C24GVK (24000 BTU Air conditioner), and the A/C board relay is burnt. If I'm not explaining myself, the A/C board is the thermostat itself, the board receive ...
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0answers
24 views
Wireless Switch Schematic Review
I would like a review of a design to allow remote mains voltage switching using a NRF24L01 module and ATMEGA328PB. I'd like to use the same design for the transmitting board and receiving board. In ...
0
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1answer
50 views
Latching/Non-Latching Relay Driver Circuit with darlington optocoupler
I'm designing a circuit where an ESP8266 controls two types of relays, a single coil latching relay and a normal non-latching relay. The relays are power relays use to control low power electrical ...
0
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1answer
42 views
What kind / type / model relay is this?
I got a bunch of electronic components from someone, but some of them came without any ID. The one below is a relay, but I think the upper enclosure is missing (containing the model/type).
It looks ...
