Build the circuit shown. With the multimeter you measure the voltage between the base of transistor T1 and the emitter of transistor T2. ![]() Measuring the voltage UBE of a Darlington pair. (Enlarge) |
![]() Circuit diagram measuring the voltage UBE of a Darlington pair. |
Turning the potentometer P1 until the Darlington pair is fully saturated, you measure a base-emitter voltage of...
UBE = 1.30 V
This value is twice as high as of a single transistor. This is a disadvantage of the Darlington pair.
But what about the gain of a Darlington pair?