A constant current source simulation using transistor: problem in Proteus

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arnab913

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Here, in the picture attached, I've simulated a constant current source using an NPN transistor, TIP series. My task is to vary the R2 resistor and measuring the current change. This picture holds the info for a certain value, R2=50k. But the current, Ic is still constant. even at that value. The calculation in Ares is quite wrong as the voltage drop is 500V in this scenario while the supply is only 100V! Is there any delicate simulation software that can do the math correctly? Thanks in advance.
 

Put your current meter in the collector. You are measuring Ib (~10mA) plus Ic at the moment.
 

Hi arnab913;
Try to add GND (GROUND symbol) to your Proteus circuit.
 

Hi,

I think this simulation is correct.
Hint: measure the base current.

Klaus
 

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