Low battery indicator

This indicator will promptly inform you that your battery is low. The main advantage of the proposed scheme is the clarity of operation. In other words, signal Light-emitting diode lights up immediately without gradually increasing brightness. Plus, the device can quite accurately track the specified response threshold.


The circuit is simple and, with proper assembly and working radio elements, begins to work immediately without configuration. All you have to do is adjust the response threshold with trimming resistor R2.

This circuit is designed for a 12 volt battery.

The circuit can also be modified for batteries with a voltage of 6 - 4 volts. To do this, you need to take resistors R1, R2 with a resistance of 10 kOhm, and resistor R4 with a resistance of 560-100 Ohms.


PS: You can assemble more than one circuit for the battery, but say three. That is, the first Light-emitting diode will trigger at a voltage of, say, 11. The second at 10.5 volts, and the third at 10 volts. Thus, you will have more complete information about the condition of your battery.
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Comments (21)
  1. Veent
    #1 Veent Guests 16 April 2011 20:42
    0
    yes yes five points everything is done by hand biggrin
  2. Dan-Star
    #2 Dan-Star Guests 20 April 2011 17:13
    1
    Is there a speaker from a hand-held radio (a small one with 2 buttons) can it be connected to the phone? Or will the mobile phone burn out?

    Or the mobile will burn out. The column says: 0.4 volts, 8 (omega) 271-1 sx. Help
    I really like this site =)
  3. feelloff
    #3 feelloff Guests 20 April 2011 19:40
    0
    No, it won't burn.
  4. Rybak27
    #4 Rybak27 Guests 26 May 2011 14:03
    1
    why are you writing here? no need to litter! smile
  5. BABA_ZINA
    #5 BABA_ZINA Guests 7 June 2011 14:50
    1
    Tell me what parts you need to take to make it for a voltage of 4.8V
    Thank you very much!
  6. feelloff
    #6 feelloff Guests 7 June 2011 17:35
    3
    Try reading the article.
  7. VVLAD
    #7 VVLAD Guests 28 August 2011 14:46
    3
    Maybe someone can post a diagram for 3 volts, is it really necessary?
    1. Guest Alexey
      #8 Guest Alexey Guests 8 December 2021 15:25
      0
      KR1171SP28 2.8 volts can be adjusted with a half ohm resistor to the control leg up to 3 volts. For the life of me I can’t insert pictures here
  8. SEREGAKONA
    #9 SEREGAKONA Guests 7 April 2012 10:22
    0
    Is it possible to use KT315i or with another index?
  9. feelloff
    #10 feelloff Guests 7 April 2012 15:28
    0
    SEREGAKONA, Can.
  10. mageffect
    #11 mageffect Guests September 2, 2012 08:32
    0
    Please tell me, is it possible to connect a relay to the indicator to disconnect the load?