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

--- Quote from: bloguetronica on August 19, 2019, 11:40:49 am ---
--- Quote from: ogden on August 19, 2019, 11:09:49 am ---Changing subject of thread to meaningless whine is much worse "off-topic" than posting irrelevant to original question, post. Completely agree that OP does not "own" the thread. As soon as thread is going and people invested their time answering question or just sharing their opinions, it becomes **common** knowledge of community of this forum.

--- End quote ---
Neither you apparently. Do you want to know who owns the thread?  Whoever owns the forum (Dave).

--- End quote ---

Dave does not own thread same way as Google/Alphabet does not own e-mails sent by me with gmail.


--- Quote ---Anyway, drifting off-topic is disrespecting the OP.

--- End quote ---

Your current post is off-topic according your logic as well, yet you openly chose to disrespect OP. How's that?
bloguetronica:
Anyway, I don't want to feed disruptive behavior, and I'm purposefully ignoring some previous posts. I think the OP should change the title back.

Kind regards, Samuel Lourenço
EEVblog:
Changing the thread topic to something completely different is silly and doesn't help anyone, please don't do that. I changed it back.

I have not followed this thread, but it's quite  common for threads to drift off-topic a bit or into other areas of a related problem when the question has been answered.
If anyone wants to bring a thread back "on topic" then you do that by posting on-topic stuff again, then people will respond to you, etc.
EEVblog:

--- Quote from: bloguetronica on August 19, 2019, 10:37:49 am ---The lack of sympathy and trolling from some members, plus 50% of topics going off... topic. That indeed characterizes these forums, but it is certainly not a feature.
The eevblog forums are on the extreme of the bell curve of forums, as atypical they are (perhaps head-to-head with reddit). Now talking about bells, I have an urge of hearing Anita Ward.

--- End quote ---

You are not helping the situation with your posts.
bloguetronica:
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. Above that current, you could use an LDO. There are also 24V to 12V DC-DC modules that are transparent enough to allow 12V operation without any drop.

Anyway, whatever solution you use, your relay will require a freewhelling diode so it doesn't damage whatever is controlling it.

Kind regards, Samuel Lourenço
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