1. fellsteruk

    Relay Identification - Help ;)

    Hey Everyone, My mother in-law who's deaf has a door bell which is wired up to the mains supply and a normal household bulb above her door in the main room of her house, when the door bell is pressed the light flashes. For the past few months this has been intermittently working and today i...
  2. moshetez

    Bosch Relay mystery

    I was looking through the Bosch automotive relay catalog and I noticed the amperage rating is two figures e.g 20/30A. Initially, I was confused and after a bit of research, all sources I came across seemed to agree that the larger figures corresponds with the NO contact of an SPDT relay. That's...
  3. alexbez

    Relay bypass help needed!

    Hey guys, I am relatively new to micro electronics, and am in desperate need of help! I want to bypass the muting circuit in a electronic piano. This involves either activating the relay, or pulling it to ground (BA3-5 Relay, and the highlighted LS1 in the picture below). Please could someone...
  4. E

    Newbie Question: Use of diodes to isolate multiple relay NO outputs

    Hi Folks, I've installed ten 220VAC LED floodlights to the outside of a property. They are powered via 12VDC-220VAC relays. The relays are controlled via 'Smart Outputs' on an intruder alarm system (IAS) using a dedicated output card. The output card has 8, 12VDC relays, of which, 4 are...
  5. T

    how can I read better datasheet of Relay(TX2SL-LT-12V-TH) to connect its pin properly?

    I have been looking around of this data sheet so I can know which pin I connect to the DC and which one I can use for NC or NO so I make my circuit running. on the data sheet I could not find due my lack experience in using relays, the pins and their functions on the following data sheet:relay...
  6. MrsssSu

    Why my Relay short-circuited ?

    I have a relay but rated at 3A, 30V DC only similar to this. When I connect the Pole and NC directly using a lithium ion battery (4V), a fire occur and it shortcicruicted. However, when i measure the resistance betwwen 2 pins (Pole and NC), it reads 16 Ohms. What should i do :) ? Thank you for...
  7. F

    Switch 60v with ,max 30v relay??

    Hi guys and girls, I need your help! I have several standard 5v relays, you know the type standard blue Square blocks. They are rated 30v DC or 250V AC I need to use them for 40-60v contactor, about 0.10- 0.15A current draw. (11w during making contact, 7w continue) The Contactor does higher...
  8. M

    Voltage/Current rating of Relay for Inductive load

    Hey, I selected a relay for my application by seeing the maximum and current rating of Relays but I am confused if the relays works fine with the given rating for all kind of loads. In my circuit the relay is being used in the primary side of the LLC resonant converter which is working under 40A...
  9. qwaspen

    Car fan auxiliary heater

    Hi! Got a problem with my auxiliary heater. I connected an auxiliary heater to my car and everything was working great. However, when I added the wiring harness for the car fan, it won’t work. I can only measure 5v at the relay, which is odd since it should be 12v. In addition to this, the car...
  10. M

    Wireless RF Relay Project: 12 Fish Feeders, Low DC Voltage Circuits

    Hi Everyone, Project Goal: Feed my fish! Tidy up and get rid of conduit and wires running eveywhere! Current Setup: I have 12 Fish Feeders powered by a DC motor, and I run all the wires run along the walls in conduit back to the controller. Each color represents one fish tank. ("1-4" feeder...
  11. D

    Electronic circuit for a dispenser

    Hi, I would like to request help from anyone who can help. I am currently doing a project which is creating a simple dispenser. This dispenser requires a programmable timer which when activated will cause a motor to rotate a piece of acrylic for about 0.75-1sec to release sand granules. The...
  12. Brian Fuller

    Daisy Chaining Relays For Motor Reversing

    I'm designing a power window switch that will use two SPDT relays to reverse the motor for up/down. I have the whole system wired and and testing properly, but I need to optimize the design for the small space in which it will be installed. Can I daisy chain the 12v+(87) together and the...
  13. Lambo Av

    Generator protection, calculating resistance for protection

    A 20kV, 100VA generator is protected by differential protection. 70% of the winding will be protected against the phase. What is the value of resistance to be located at the "Neutral to Ground" protection if the relay operates 30% out of the balance current? Below are my steps to the solution...
  14. M

    Struggling to understand bizarre voltage drop on parallel relay circuit.

    Please bear with me as I am a circuit-design newbie. I'm obviously misunderstanding something basic and will kick myself when you explain it to me. I have gotten the bug to do some electromechanical computing circuits using relays. I was warned that "that way lies madness" but like a fool I...
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