Since the text says that collector voltage of Q1 is maintained constant by Q2(buffer) in order to cancel harms of early effect...as Vce of Q1 doesn't change with load voltage....
If suppose temparature fluctuates causing a variance in Vbe of both transistor ....then how can current buffer transitor Q2 is able to make collector voltage of Q1 constant since...it should change with a change in Vbe?
If suppose temparature fluctuates causing a variance in Vbe of both transistor ....then how can current buffer transitor Q2 is able to make collector voltage of Q1 constant since...it should change with a change in Vbe?
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