Electronics > Projects, Designs, and Technical Stuff
How to use the same RELAY on 12V & 24V vehicles
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EEVblog:

--- Quote from: JDW on August 19, 2019, 04:45:02 am ---Sorry, but there's where I draw the line.  "Nobody is forcing you to hear the chatter" is a ridiculous statement because I created this thread and therefore it's obvious I will follow it to see if someone ever posts a relevant-to-the-title reply that may interest me.
Why not just start your own thread(s) and leave this one alone so that people who come to this threat with the understanding it will be on-topic can follow this thread more easily to its final conclusion?
This is becoming an example of why most forums cannot moderate themselves because many people posting to the forums think they are always right going about it the way they feel is best. But I assure you, when there is conflict brewing, it's time to create your own thread.  So please do that.  Now.
Thank you.

--- End quote ---

And you are also doing that now by insisting that threads stay completely on-topic with zero side-banter and technical tangents.
This forum has grown into being one of the biggest and best engineering forums on the internet partly because it doesn't insist on strict moderation like that.
I've seen technical forums die because everyone tries to play forum-cop and moderate the forum into oblivion, I won't let that happen here.
People can "moderate" threads by politely asking if people could keep it on topic, or better yet, simply post on-topic stuff themselves and lead by example.
EEVblog:

--- Quote from: JDW on August 18, 2019, 09:20:53 pm ---Might as well talk religion, politics and space exploration too. Apparently, anything goes in this forum!

--- End quote ---

FYI, religion and politics are essentially banned here. Start talking that and threads get locked. Do it consistently and you'll get banned.
Space exploration talk is technically interesting and is basically an engineering related problem, so it's good.
mariush:
A 12v battery could be below 12v but 12v relays would work still.
did anyone mention bi-stable relays?
You could then use a ldo for the 2-3s pulse needed to switch the relay...but then you'd have to hold some charge so when power is off you can reset the relay to other position, if that's important.
ogden:

--- Quote from: bloguetronica on August 19, 2019, 12:08:25 pm ---Now, my answer. The quick and simple solution, provided your relay requires a very low current ( below 20mA) is to just use a 12.6V Zener diode in series.

--- End quote ---

Are you sure such solution will work not only on 24V supply but on 12V as well? How? Please explain.
Zero999:

--- Quote from: ogden on August 19, 2019, 12:26:36 pm ---
--- Quote from: bloguetronica on August 19, 2019, 12:08:25 pm ---Now, my answer. The quick and simple solution, provided your relay requires a very low current ( below 20mA) is to just use a 12.6V Zener diode in series.

--- End quote ---

Are you sure such solution will work not only on 24V supply but on 12V as well? How? Please explain.

--- End quote ---
It won't work. All a zener will do is reduce the supply voltage by 12.6V.


--- Quote from: ogden on August 19, 2019, 11:43:52 am ---

--- Quote from: Zero999 on August 19, 2019, 11:33:14 am ---
--- Quote from: ogden on August 19, 2019, 11:09:49 am ---[edit] Show respect to those who did stick to original subject and be so kind - change subject back to original.

--- End quote ---
I did and you changed it back. This reply was solely to change the topic back to the original again. Please don't change it back again.

--- End quote ---

LOL. You did not change subject of the *thread*, just your post. Also - I did not answer to your post.

--- End quote ---
That's strange. When I changed the title of my post, the name of the thread also changed, but then it reverted back, when you posted. I apologise for accusing you of doing it intentionally.

Anyway, here's another idea, based along the same lines. The switching is harder and faster so it should be lower loss and it has better current regulation, as the sense resistor is directly in series with the relay, but requires more parts.
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