We will make some changes to the first circuit. Even when not in use, it should be charged with a low current of about 0.1C. Therefore, we should always charge it to keep the voltage at 12.4V or higher. Because of its natural discharges, if left for a long time, the battery will deteriorate even faster. Usually, when we leave the battery idle, the voltage level will gradually decrease. Always maintain a voltage greater than 12.4V.It should not be placed near a heat source or in direct sunlight. Preventing the battery’s temperature from exceeding 50 degrees, which if used normally, it would not get that hot.But what could we do to extend its lifespan even further? There are two important things that we should do: Of course, the battery has its own lifespan. And importantly, it is easy to recycle at a general recycling store. According to my experience, we might be able to use this battery for up to 6 years. Lead-acid batteries are still popular because they are commonly used in cars or motorcycles. So, we will use a 12V 45Ah Lead-acid battery instead. We want to use a 12V 8A water pump (2000GRH Model) in the garden which has no AC electricity. This circuit will alarm when the battery voltage gets lower than 12.4V. Thanks a lot.ġ2V Low Voltage Battery Indicator Circuit Here is a video of electronics more that makes this project worked very great. The video below shows the testing of this circuit. Because the LM339 can be used with a wide range of power supply voltages from 2V to 36V at 0.8mA. In addition, adapting some components can be very useful if you wish to use this circuit at an alternative voltage level. For example, to use a 7.6V voltage, just adjust the sensitivity of the circuit by changing the comparing voltage with a VR1. This circuit can be used with a voltage level of about 6.1V to 18V. The LED1 will glow again, and the BZ1 will immediately emit a loud noise. On the other hand, if we moved the probes back to 7.6V or 6.8V, respectively. It will also keep 0.7V across itself, resulting in a voltage deduction at each level. The silicon diode will conduct when its forward voltage reaches the voltage threshold, which is about 0.7V. But let’s use the easiest way possible by using a ladder regulator using diodes. We would need a constant voltage level to test and fine-tune. This circuit will alarm us when the 9V battery voltage level is lower than 8.3V. We assemble this circuit on a breadboard. Recommended: Recycle Free Li-ion battery from E-waste Experimenting with 9V battery alarm circuit Perforated board, wires, 8 pin socket for IC1 IC1: LM339 Voltage comparator IC: Buy HereīZ1: 6V-9V Active Electromagnetic Buzzer. What more? The experiment below will help us understand more. They will work at the low output voltage only. They are both connected to pin 2 (output) and positive voltage (+V). Then, we will add the LED1 and BZ1-buzzer as indicators of the output. On the other hand, if the voltage at pin 5 is less than at pin 4, Pin 2 will output almost no voltage at all. If the voltage at pin 5 is greater than at pin 4, Pin 2 will output a high voltage almost equal to the power supply. Both voltages are then compared by IC1 any result will be output to pin 2 (output). At the same time, some current from the 9V battery also flows through to a VR1 to the input pin 5 (non-inverting input), also known as a comparing voltage. The ZD1 works as a 6V Zener regulator to keep the reference voltage level at pin 4 (inverting input) of IC1. Then, R1 passes the safe current level to a 6V Zener diode (ZD1).
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