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How to build Battery Voltage Indicator Circuit

2016-05-11 07:17  
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Connecting this circuit to the battery of your vehicle, you will always know at a glance the approximate voltage available. An indication of battery voltage is useful to the motorist for monitoring the battery's capacity to deliver current, and as a check on the efficiency of the dynamo or alternator. Threshold voltages of the Leds are set by means of two Zener Diodes (D6 & D10) plus two further Diodes wired in series (D4, D5 and D8, D9 respectively) adding a step of about 1.3V to the nominal Zener voltage.

Circuit diagram:

Battery Voltage Indicator Circuit-Circuit diagram


R1 = 1kR2 = 100KR3 = 1kR4 = 3.3KR5 = 3.3KR6 = 1kR7 = 3.3KR8 = 3.3KQ1 = BC547Q2 = BC547Q3 = BC557D1 = Red LedD2 = Amber LedD3 = 1N4148D4 = 1N4148D5 = 1N4148D6 = BZX79C10D7 = Green LedD8 = 1N4148D9 = 1N4148D10 = BZX79C12


Red LED D1 is on when battery voltage is 11.5V or less. This indicates a low battery charge.Amber LED D2 is on when battery voltage is comprised in the 11.5 - 13.5V range. This indicates that the battery is good if the motor is off. When motor is running, this indicates no charge from dynamo or alternator.Green LED D7 is on when battery voltage is 13.5V or more. This indicates a normal condition when motor is running and dynamo or alternator is charging.

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