18 February 2010

Low-battery indicator circuit

I designed this little circuit to show a battery’s status.

It lights an led to show the battery is OK, and will change to show another colour when the battery’s low.

The transistors can be any npn-type, and the leds can be any colour (in the diagram, green=ok, red=low)

The operating voltage range is ~3v-12v, and by adjusting the resistor values it will work beyond that.

The voltage the low led comes on at, is set by the potentiometer.

2 comments:

  1. Hi Daftmike !!!

    Many many thanks for sharing this simple circuit for everyone!!!

    I have since made 4 stripboard circuits AND 4 PCB's of this Low Battery Indicator !!!!

    As i have only started learning electronics i had found your instructions from your post on ModRetro extremely easy to follow because you used pictures and made it idiot-proof, lol !!!

    Truly AWESOME !!!

    Thank you so much!!!

    A.K.Sethi

    ReplyDelete
  2. great!
    for my modded power bank!
    thaks!!

    ReplyDelete