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2 comments:
The POT R4 can be adjusted to get a constant current of 10uA and the POT R5 can be adjusted to get a constant current of 10uA. There are two circuits in this schematic: One to test PNP and other to test NPN. You need calibrate and test both :)
The value of this constant current can be given by the equations:
(VD1-0.6) / (R2+R4) Current for Q1
(VD2-0.6) / (R3+R5) Current for Q2
How the circuit work using 9V, I think is possible the use of other equivante transitors, such as the pairs: (2N2222A / 2N2907) , (BC337 / BC338) , (BC547 / BC557) and (BC548 / BC558)
All these are general purpose and low power transistors. :)