Easy and cheap FULL CHARGE INDICATOR

Full charge indicator

            Some time we charge battery directly to the charger but then we forgot or not sure the battery is fully charged.therefor battery is damage or blast.
         
            Here I make a easy and cheap circuit using simple op-amp,there is only 4 or 5 component are using in this circuit diagram
You can show it Below,
Components:-
> 10k or 1k variable resistor
> 1k resistor ×2
> IC 741(any op-amp IC)
> RED & GREEN LEDs

SET RANGE:-
=>First connect full charged battery with circuit.
=>Set variable resistor at, when RED led is turn in green (that initial time)
=>That range is for that battery, after that you can connect other same battery and charger it that range.

*you can use any op-amp IC
*Also use 1k variable instead of 10k.

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