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Need help with planning circuit :)

Discussion in 'General Electronics Discussion' started by Daniel.ru92, Oct 31, 2012.

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  1. Daniel.ru92

    Daniel.ru92

    2
    0
    Oct 31, 2012
    I have new project - I'm building boombox with 12v battery like that:
    http://www.zbattery.com/B-B-12V-20Ah-10-hr-rate-Sealed-Lead-Acid-Battery

    Now, I want to build electronic circuit that when I'll push a switch, one of three LEDs will turn on:
    If the battery is full charged, the green led turn on.
    If the battery have anough energy, the yellow led turn on.
    If there is low battery, the red led turn on.
    If the battery is charging (connected to power supply), all three LEDs will turn on (or another blue led, if it's too hard).

    Please help me plan the easiest schema, so I can build it just with buying the right parts, and put it together on electronic board...

    Thanks!
     
  2. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    The basics can be seen here...

    http://electroschematics.com/6868/12v-battery-level-indicator-circuit/

    You can adjust the values of the resistor ladder to curve the response of the LEDs... As for the LED when the charger is hooked up we would need more info on your charging circuit, generally a charging indicator is done with a make/break switch in the the plug, or at least that is one of the easiest ways...
     
  3. Daniel.ru92

    Daniel.ru92

    2
    0
    Oct 31, 2012
    I didn't build yet the charging circle, so please draw me a schema, because I new at the subject...
     
  4. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Google 'lead acid battery charger' and use a plug that has a make/break switch so that you can toggle the charge LED when plugged in or not plugged in...
     
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