proteus stimulates wrong circuit

[gauravkothari23]

hi all....
i am trying to make 3.7v li-ion battery indicator using 2 led...
at 4.1v when battery is fully charged, both the led's will glow...
and when battery voltage reaches to 3.2v, only one led will glow...
i have tried stimulating my circuit in proteus(Image Attached)
while i stimulate it works perfectly....
but when i tried building the circuit only led of pin10 glows.... and even after adjusting the pot 10k i am not able to glow both the led....
what's wrong with it....
i have checked my connection trice.... i dont see any errors in my circuit.....

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i have also seen that connecting an LED without any resistor directly to 12v battery in proteus makes the led glow...
but practically if done... led blows up....
why is it so....
should i stop using proteus....
can anyone suggest me any other software which works perfectly and with reference i can make my circuit diagram....

 

[MrCarlos]

Hello gauravkothari23

All simulators for electronic circuits have their own bugs.
Circuits operating properly in the simulator do not make the same when We assemble in reality.

One of the things I see in your design, which you enclose in the image of your original message, is that you forgot the voltage drop across the diode 1N4001.

About 0.7 V is the voltage drop across the diode.
So when the battery is 3.2 V. the bias voltage to the LM3914 is: 3.2 - 0.7 = 2.5 Volts.
Analyzes data sheets LM3914 respect to this bias voltage.

This diode is also affecting the measurement because when the battery is 4.2 V, the Vf. is different when it is 3.2 V.

Now: What are the electrical characteristics that have the LED's that you're using ??
In general, the LED’s require a current (Vf.) 10 mAmp.
When that current flows through them, in their terminals there is a voltage drop (Vf) of 2.2 V.

I hope that helps for you to continue with your project.