Electronics > Projects, Designs, and Technical Stuff
How to use the same RELAY on 12V & 24V vehicles
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Zero999:
All threads drift off topic, but as long as it's vaguely technical, I don't see the problem. In this case someone posted a circuit originally designed for something else, but might suit the original poster's application. Inevitably the topic wandered off to the subject of that circuit. If you feel as though your question has not been answered, simply provide more information, rather than complaining about it.

Anyway, back on topic. The circuit Soldar posted can be modified into a crude switched mode power supply by adding a couple of RC circuits. It will self-oscillate at around 1kHz, when the current exceeds a certain threshold, determined by R1, which will give about 60mA, in this case. The inductance of the relay will smooth the current so it doesn't chatter. At low supply voltages, Q1 will simply be solidly on, with no oscillation. The efficiency won't be great, but it's better than a linear current limiter.

The circuit can be driven from a 5V microcontroller output if R2 is reduced to 2k2 and its positive node is connected to the output, rather than 24V.
ogden:
TLDR; - Did anybody suggest to use switching supply to create 5V rail for 5V relay and LDO for 3.3V rail?

Now I technically posted off-topic because thread is about "Re: A thread that has gone off-topic". Whatta...
Zero999:

--- Quote from: ogden on August 19, 2019, 11:29:59 am ---TLDR; - Did anybody suggest to use switching supply to create 5V rail for 5V relay and LDO for 3.3V rail?

Now I technically posted off-topic because thread is about "Re: A thread that has gone off-topic". Whatta...

--- End quote ---
I'm not sure if those exact solutions have been proposed, but I think a switched mode power supply has been mentioned before.

EDIT:

--- 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.
bloguetronica:

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

Kind regards, Samuel Lourenço
ogden:

--- 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.
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