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This project explains you how design battery level indicator with few components. You can use this circuit to check car battery or invert-er. This circuit helps you to increase the life time of the battery.
If you want to change this circuit as adjustable then please use variable with it as shown in the diagram. In this circuit i have used just a 5 k potentiometer to adjust the measurement of volts. In this way this circuit become more flexible now you can measure even till 40 volts. In this way next LED required more volts to glow as compare to previous.
How to Build a Voltage Level Indicator with a Zener Diode In this circuit, we are going to show you how to build a voltage level indicator with zen-er diodes. In this project we have used 4 zen-er diodes of different powers to make a perfect voltage level indicator. A normal diode acts as a short circuit in forward bias condition while in reverse bias condition, it acts as a open circuit. A Zener Diode has a breakdown when a certain voltage level is reached. If a zener has a breakdown voltage of 5.
In this circuit, the type of zener diode we have used are: 1N 3. In this way you can increase the no of zener and no of LEDs to make it more suitable.
1N4734A: Zener 5.6V 1W 5%
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