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Automatically detecting the battery voltage indicator circui

2016-05-11 11:39  
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Automatically detecting the battery voltage indicator circuit diagram
the battery voltage indicator This simple circuit can detect the battery voltage. When the voltage is lower than the preset voltage set by the variable resistor VR1, LED will light up, in fact, related resistance and VR1 will be bias maintain Q2 (OFF) of Q1(ON), so that the LED is OFF. When the battery voltage is gradually reduced to below the preset voltage, Q1 becomes OFF, Q2 becomes ON, the LED lights up. This circuit can work under the 12V battery. You can first use a variable power supply, adjust the the low-voltage you want, connect to the circuit, adjust VR1 to critical value of beginning to light or dark.