Introduction: 9v Battery Status Indicator Circuit

This is a 9v battery status indicator circuit.One of my friend asked me to build this as he wants a 9v transistor radio battery status indicator. Thats why i build this circuit it works great and another thing about this circuit by changing the 'ZENER diode" you can rebuild this circuit for other low power battery. I used Green and Red led as green Led light's up when the voltage is upper than 6.9v and Red led lights up when the voltage drops to 6.9v . Its simple and reliable all the parts are commonly available and low cost also. 

parts List :

Led (RED & Green )
ZENER 6.2v (for using with 9v battery)
330r
47k
BC547
10k

Comments

author
riyaz dange (author)2015-08-25

author
riyaz dange (author)riyaz dange2015-08-25

sir can i ask for a ckt for 6V battery status indicator? thank you!

author
riyaz dange (author)riyaz dange2015-08-25

please reply me as quick as you can.

author
afz2004 (author)2015-06-11

First time, I build this circuit, I also faced a problem, where two LEDs lit up when voltage is above than set value which determined by zener diode. So, I make some modifications on its base resistor at transistors, and it worked out. Hope it will help you guys! Done with Proteus 8

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author
victordas (author)afz20042015-06-12

Conzrzzzzzzz ......

author
Grapheno (author)2015-01-24

Multisim

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author
Grapheno (author)2015-01-24

This circuit sound great to make a flip flop circuit however I have tried in Multisim and the red and green light both are lighting till 6,9 volts.

Actually, I would like to make this circuit in 7,4 lithium battery and I have tried to calculate the reistance and I find it quite difficult.

Do you know any page to calculate it, or could you show your results in your project.

Thanks,

author
neneythXD (author)2015-01-05

sir can i ask for a ckt for 6V battery status indicator? thank you! :)

author
apeiris (author)2014-05-29

please give me a NP4.5 6v 5Ah battery charging indicating circuit diagram

author
victordas (author)apeiris2014-08-24

Ok i will try bt it will take little time

author
muralim.murali.50 (author)2014-08-22

sir how to set low led indication for 4v and high led for 8v.. can u help me???

author

First of all change the Zener diode as you need. Than set the circuit

author
zlin1 (author)2014-06-15

Hi do you have a picture of the built circuit? ive been trying to replicate it on a breadboard and couldnt get it to work. thanks

author
victordas (author)zlin12014-08-24

Sorry my frnd i don have any picture of the above circuit

author
septi0 made it! (author)2014-04-09

Hi there!I just made this circuit and when battery level is above 6.9 v both leds light..Just when the battery level is under 6.9v only the red led lights.

I mean that the red led is always on when connected to battery.Is that ok?

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author
victordas (author)septi02014-04-13

"green Led light's up when the voltage is upper than 6.9v and Red led lights up when the voltage drops to 6.9v"

Check your circuit properly

author
septi0 (author)victordas2014-04-13

Does it matter that I used 2 BC546b tranzistors instead of BC547?

author
victordas (author)septi02014-04-14

yes it does matter wid that. bc547 most common parts.

author
Fozzibehr (author)2013-10-09

So could you do this with a 12 volt battery and 4 leds? and could you clarify what the zener 6.2v is?

author
iliceras (author)2013-06-27

they are rechargeable batteries (1.2v each), shall I use a 3.6v diode?

author
victordas (author)iliceras2013-06-29

hoo yes u can try that .............

author
iliceras (author)2013-06-27

Thank you very much for your design, it's really useful to me.

I got some questions, hope you can help me:

- I would like to place 3 different LEDs on my circuit to indicate the charge level for a 4 AA rechargeable battery pack. They all together and completely charge would give me 4.8 volts, which Zener diode do you suggest to me?

- Could I use 1 zener diode and different resistors values to light up the different leds?

author
victordas (author)iliceras2013-06-27

1sly.....1.5v x 4aa would give u 6v not 4.8v.......as far i think u could use a 4.8v zener.....try 2 build the circuit in bread board 1st...........

author
mylalara (author)2013-03-13

how can i create a 4.8v battery indicator??

author
victordas (author)2013-01-22

Yep i think Green led will light up......but it will be for few sec's. just saying. Nd Adarsh 10q very much

author
Adarsh_tronix (author)2013-01-21

Hi,
suppose we have a voltage somewhere in between 5.9 volts and 6.9 volts.The red Led will definitely light up but will the green Led still continue to glow?.well,I know that the green Led will light up since it gets more than 5.9 volts but just wondering......and by the way you deserve some credit for this simple but creative model.

author
victordas (author)2012-12-23

""kurtselva"" these values came up experimenting with the circuit day's month's nd year's. Actually i can't explain ur 1st question and i suggest you that you should start experimenting with the circuit in a "bread board" nd see urself what comes out. Good Luck

author
kurtselva (author)2012-12-22

Hi,

May i know how you came up with the values for the resistors and zener diode?

And how will the values change if I use a 1.5V battery source instead?

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