Question DaftMikes Low-battery Circuit

Discussion in 'Other' started by ByteMe, May 1, 2017.

  1. ByteMe .

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    I am wanting to build this, or something similar with two leds, green power indicator and then switches to red led when low voltage occurs. Does anybody have the schematic saved somewhere, all I could find were dead links. Also it suggests any npn transistor, any suggestions on some good general use npn's that would work for this as well (placing an order though digikey) . Thanks
     
  2. Matthew Formally known as Chaos .

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    Here is an alternative. It works quite well and for the parts,space, time, and complexity it saves, I recommend it over the other way.
     
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  3. ByteMe .

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    Thanks, I came across that one as well. I prefer the dual led's just for aesthetic purposes, but I'll consider your alternative.
     
  4. Gman RTFDS Staff Member . . . . .

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  5. cheese the tallest memer in town Staff Member . . .

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    With this you could also use a RGB led and have the same led be for green and red, just make sure it is a common anode type.
     
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  6. ByteMe .

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    I was hoping to do that, would this one be fine, or do you have a link to a through-hole alternative. I am wanting to sort of backlight a larger area so would two in parallel be fine?

    Edit: Fixed Link
     
    Last edited: May 1, 2017
  7. cheese the tallest memer in town Staff Member . . .

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    Two in parallel would probably be fine, just make sure to drop the resistance of the resistors on the anodes of the LEDs to make up for it. Also that link is just a generic search page, with almost 5m results, gonna have to narrow it down a bit more :P
     
  8. ByteMe .

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    Whoops it was working on my end, edited the original post.
     
  9. cheese the tallest memer in town Staff Member . . .

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    Yeah that should work fine, it has separate cathode/anode pins for both LEDs so you can wire it up exactly like the schematic (but remember to lower the 1ks to something like 500ohm)
     
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