Also being old school, I follow the KISS method. Keep it simple stupid. And what could be simpler than a relay?Hi
I am a retired engineer, my question is as follows:
How do I auto switch over from mains supply, regulated down to 9v, to battery without dropping power, and return to mains power from battery after a power drop.
We may be missing part of the issue.Two diodes. No moving parts. Switches far faster.
Go back and read the first post. He is trying to run a 9V device from a mains to 9V supply with a battery that takes over when the mains supply is interrupted.Is he trying to run a power supply in parallel to a battery backup? Or does he want isolation also?
True. And, for every electrical problem, there are at least 27 solutions.Go back and read the first post. He is trying to run a 9V device from a mains to 9V supply with a battery that takes over when the mains supply is interrupted.
Yes, a relay will work but I think two diodes is simpler, smaller, faster, quieter, cheaper and more reliable. You may disagree, no problem. Nothing wrong with having options.
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