## Tuesday, February 3, 2015

### 36V Battery Level LED Indicator Circuit Schematic

Eltronicschool. - One way to know battery level is using LED indicator. With this way we will know how is the level of our battery and we can anticipate to do more. In this time we will show you one circuit schematic for battery level indicator using LED specially for 36 volt dc as like in figure 1 below.

Circuit Schematic

 Figure 1. 36V Battery Level LED Indicator Circuit (Source: Electroschematic)

Component List
1. Zener Diodes 6.2 Volt
2. Resistors
3. Transistors
4. IC LM329
5. Variable resistor
6. LED Red, Orange, Yellow, Green, and Blue
Description

Circuit schematic like in figure 1 above is 36V Battery Level LED Indicator Circuit that will indicate some battery level indication like in table 1 below.

 Table 1. Note of LED indicator of battery level condition

Main component of this circuit is voltage comparator IC LM329. So, the output of this IC will give output on and off depending the two input condition. As the input of this IC are come from voltage as reference and adjustable from the resistors that combine.

So, from the main article of 36V Battery Level LED Indicator Circuit describe of circuit operation as follow:

D1 is the voltage reference zener. Tied to this is a string of divider resistors (R2-6) that set the various fixed voltage levels. R7 & 8 form a voltage divider to that divides the battery voltage by a factor of 9. The quad comparator compares the various voltages from the two dividers.

For calibration, connect to a voltage source that can be set to the highest LED threshold (41V in this case). Then adjust the calibration pot until D2 flickers. The remaining LEDs will switch on close to the indicated voltage –accuracy of those voltages may suffer slightly, but should be close.

The LEDs are biased to operate at 2.3mA which is reasonably bright for high efficiency LEDs. This current can be adjusted simply by varying the emitter driver resistors (R9 through R13). To reduce standby power, a push-to-test pushbutton may be used.

All of the 36V Battery Level LED Indicator Circuit schematic can you read more from the original article below.

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