1. 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...
  2. G

    Two LEDs and 2 SPST. Four states?

    Hello, Newbie question I have a device that have two SPST relays that I control. From these relays, I would like to control the ON/OFF states of two LEDs (red and green) and a high/low brightness state. This gives four possibilities: Red High brightness Red Low brightness Green High brightness...
  3. snajperisti

    Snubber Circuit Design 230V, 16A, Problem in small load, Current Flow!

    Hello We designed this Snubber Circuit with this varistor in parallel but we have a problem in a small load. Even when the relay is disconnected, a small current is flowing. For example, when connecting a phone charger, the phone screen keeps turning on and off. The varistor is Hongzhi Elec...
  4. A

    Relay for Solar System as Backup Only

    Background I'm working on a seismic alert network and seismograph station at my school in Puerto Rico. We're building a solar system for the system to continue running during a potential seismic event. The system only consumes about 10 Watts, but with the satellite internet equipment it might go...
  5. D

    is there a relay or solenoid valve that support 4 5 times open and close per second ?

    hello everybody ... for a project i want to use the pneumatic for sorting purpose is there any solenoid valve pneumatic with that features ... ? if not whats the fastest relay i can use for my project ? is it the simple way possible that complete my project without relay or solenoid valves ???
  6. J

    Relay circuit- automotive

    Hello. im seeking some help designing a seemingly simple circuit. I’m not experienced enough with this so I’m hoping you can assist. It is in an automotive application. 16vdc electrical system with common ground. I have a normally open ground that is closed when engine rpm rises to a chosen...
  7. C

    Install timer delay in pump circuit

    I am looking to install a delay timer in a simple 12v circuit that supplies a well pump (6A) in a garden powered from a solar charged battery. I want the pump to run for 10mins when a circuit is closed on a toggle switch. If the pump is to restart after it has stopped, the toggle will need to...
  8. K

    I need help with my circuit (optocoupler, transistor, relay)

    Hello, i've got a newbie question, i hope some of you more experienced guys can give me an answer. I've recreated a simple circuit, that closes relay contacts using optocoupler and transistor, just for fun and i've found out that it's not working, after some time i've succeded to get the circuit...
  9. TribbleRED

    Golf Cart Paddle Shifter

    Yup, you read that right... paddle shifters on a golf cart :cool: ***Disclaimer*** Out of respect for you boys and girls I have spent quite some time trying to figure this out before coming here so as to refrain from a drive-by post where the answer could have been found had I tried a little...
  10. maitrey

    Design Interlock for two operations (Manual Switch and Automatic Switch)

    Hello, I am in the process of designing an interlock for two operations. 1. Operated by Manual Switch 2. Remotely through an Automatic Switch (Can't be controlled Manually) If user turns manual switch then operation should start. (In this case, if someone activates automatic switch it should...
  11. 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...
  12. Nutcase1

    Car headlight projector for my son

    Hi I'm new to this site and yes I have very basic knowledge with electronics, I'm hoping someone here might be able to help me, I'm trying to modify my sons car by installing projector headlights but the problem I'm having is converting the lights from a dual filament (H4) to a single filament...
  13. sforsandeep

    Turn on relay by default, turn off when push button press

    Hi Friends, Myself a very beginner in electronics and I'd like to build a design to control an AC device. When activating a momentary push button, it should turn on the device. When pressing another button, it should turn off the device. But I'd like to make this without Arduino or any MCU. I've...
  14. G

    How can you design a PCB for climate control as well as to turn on lights via relay?

    I’m pretty much a noob when it comes to hardware and for awhile I have been trying to figure out how to design a PCB layout. The Problem I have is trying to figure out the values for capacitors and resistors how to connect them with the other parts (like pull up resistor, bypass capacitor etc...
  15. Timbat365

    Pallet shrink wrapper automation.

    Hi, I know this is a simple one for most of you but I’m quite new to this so please be gentle. I have an old pallet wrapper that I would like to automate. I still want to be able to use it in it’s current form so was going to start with a “manual/ auto” selector switch after the turntable has...
  16. pplg

    Keep MOSFET "ON" for a certain time

    Hello everyone! I'm currently designing a simple circuit which is working as I want but I'd like to make sure that I haven't done any dumb mistake. That's why I'm asking here. I'd like a signal to switch ON a MOSFET in order to activate a relay. This signal is usually low (0 VDC) but sometimes...
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