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need link to how to build battery tester

 
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joka
HG Junior


Joined: 19 Feb 2007
Posts: 12
Location: England

PostPosted: Fri Mar 02, 2007 2:52 pm    Post subject: need link to how to build battery tester Reply with quote

hi i need link to a website on how to build a battery tester? i would prefer to build one with leds to indicate if batter is full or low
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Nginuity
HG Ruler


Joined: 13 Nov 2006
Posts: 224
Location: Dallas, Texas

PostPosted: Fri Mar 02, 2007 9:56 pm    Post subject: Reply with quote

You can accomplish this with a simple comparator circuit (Two comparators actually). You would just have to know your threshold voltages...when you consider it low, and when you consider it full.

Use a comparator integrated circuit: http://www.national.com/pf/LM/LM139.html

Here is a website that shows you how to have it display in steps: http://www.electronics-lab.com/projects/automotive/009/

They recommend the LM3914, which is a bar driver IC, but I have seen it done with a LM324 quad op amp IC too
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joka
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Joined: 19 Feb 2007
Posts: 12
Location: England

PostPosted: Sat Mar 03, 2007 2:53 am    Post subject: reply Reply with quote

i need one that can be used for 1.5v, and up to 9 volt batterys, the circuit above is for car battery
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Nginuity
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Joined: 13 Nov 2006
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Location: Dallas, Texas

PostPosted: Sat Mar 03, 2007 10:39 am    Post subject: Reply with quote

right, but you can use it for a different voltage range by adjusting the potentiometers.
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