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Battery_level_indicator_with_a_regulated_LED_current

2016-05-11 09:32  
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Battery_level_indicator_with_a_regulated_LED_current
This circuit also regulates current through the LED so that adequate current is available at minimum voltage, but excessive current is not drawn at maximum voltage. Minimum threshold voltage is limited by LED bias (typically 1.7 V for red, 2 V for green and 2.5 V for yellow). With a red LED, the threshold can be reduced to about 2 V. The threshold voltage is 6 V for the resistor values shown.