0.4mA - 0.5mA current source

[hamsiii]

I want to implement a current source to my circuit and I should do this by BJT.
It should be Beta stable, Ic should not change with heat.

 

[Prototyp_V1.0]

Is this supposed to be a variable current supply? Then what should the input be?

 

[hamsiii]

it should be a constant source and i have only +12Vdc supply.

 

[Prototyp_V1.0]

Hi.

This circuit is considering being quite stable.

 

[FvM]

I would prefer a fully temperature compensated current source, e.g. a resistor degenerated current mirror.

 

[hamsiii]

thanks for your reply, i'll try that circuit now. current mirror is not preffered in our project, i first set up a mirror already.