Electronics Zener regulator

  • Thread starter John1397
  • Start date
156
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Found this online I added 3 volt battery how do you figure out what size resistor to use?
 

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berkeman

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You cannot use a 5.1V Zener diode in a regulator for charging a 3V battery...

And Zener regulators are pretty sloppy anyway -- in general it's a lot better to just use a 3-terminal linear regulator. And battery charging can be a fairly complicated matter, depending on which battery chemistry you are working with...

1570111355058.png
 

Tom.G

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@John1397, As berkeman stated...

You cannot use a 5.1V Zener diode in a regulator for SAFELY charging a 3V battery...
Since you didn't give many details, here is the scenario:

If you really insist on this approach, do it out doors, nothing around that you want to keep (like people, animals, or houses), and don't mind destroying a battery, then a 35Ω, 50Watt resistor would be about right.

Oh, and stay up-wind of it.

I really recommend that you take heed of the approach by @berkeman though.

That said, here is a sight with a great amount of information about batteries and how to charge and use them: https://batteryuniversity.com

Cheers,
Tom
 

berkeman

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If you really insist on this approach, do it out doors, nothing around that you want to keep (like people, animals, or houses), and don't mind destroying a battery
LOL 😉
 

dlgoff

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... battery charging can be a fairly complicated matter, depending on which battery chemistry you are working with...
Indeed. :approve:

For the OP, check out Battery University.
 

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