Relay Required

[Insipid]

Connect the circuit this way.
When the trigger is 0v, the relay will energize.
When the trigger is 12v, the relay will de-energize

View attachment 127733

I don't quite get the relay in this diagram. Hell, I don't get the whole thing really.

 

[m_arazik]

it seems that P MOSFET idea will not be practical, everyday i'm changing one as it get damaged and get heated too much
i think relay will be a better idea

 

[Insipid]

Relay wont trigger at 0v unfortunately, else I would just use one myself. For me only a mosfet works in this situation. Mine is 53A, so it should surely handle a lot of heat. Plus I bolted mine to the bracket of the relay so it becomes its heatsink.

 

[m_arazik]

Relay wont trigger at 0v unfortunately, else I would just use one myself. For me only a mosfet works in this situation. Mine is 53A, so it should surely handle a lot of heat. Plus I bolted mine to the bracket of the relay so it becomes its heatsink.

did u do circuit like this ? .. please send me photo

 

[Insipid]

did u do circuit like this ? .. please send me photo

Need help wiring up something by tomorrow (story inside)!

Hello! I have a situation, I have to have my car compliant by Tuesday and I only have tonight and tomorrow to work on this project. So if I could get some quick help in the most basic way that would be fantastic! I have a situation similar to this thread...

www.electro-tech-online.com

 

[m_arazik]

somebody sent me this connection for relay

 

[m_arazik]

Wow, this is exactly 100% my case, please give me full details with components no and connections and photos if available please

 

[Insipid]

Wow, this is exactly 100% my case, please give me full details with components no and connections and photos if available please

https://imgur.com/a/Yul51vI

everything else is in my other thread! enjoy!

 

[m_arazik]

what is the relay number ?
did u use and resistors ? 100 ohm and 100k ohm
connection is the same as in the image above between your MOSFET and relay ?

 

[Insipid]

what is the relay number ?
did u use and resistors ? 100 ohm and 100k ohm
connection is the same as in the image above between your MOSFET and relay ?

https://imgur.com/a/5HOy1zF

Everything is in the other post I said. I didn't use any resistors. It's the same as what that other guy drew for me on my diagram thing.

 

[m_arazik]

https://imgur.com/a/5HOy1zF

Everything is in the other post I said. I didn't use any resistors. It's the same as what that other guy drew for me on my diagram thing.

Ok thanks i nearly got all the components
Have only one doubt
In the picture attached now 3 pins marked by red
What will be connected to these pins ?
The pin marked in green, this will be the new 12 volt output ?

and i cannot understand why relay is needed ?

 

[Insipid]

The green is earth/ground.

The red, well one is the voltage for what you want powered and one is the source of that power. The middle one is not used. So you're going in between an existing power line and interrupting it with the relay. Relay is what switches between on and off. MOSFET tells the relay to switch when it's 0v.

Not too bad once you make it!

 

[m_arazik]

so i can use
87 for the device i want it to be powered
87A not used
30 continuous 12 volt supply
86 is connected to MOSFET drain pin
85 is connected to 86 through a diode and then to ground

sorry i have no idea about this at all

correct ?

 

[Insipid]

so i can use
87 for the device i want it to be powered
87A not used
30 continuous 12 volt supply
86 is connected to MOSFET drain pin
85 is connected to 86 through a diode and then to ground

sorry i have no idea about this at all

correct ?

yeah pretty much!