Darlington Transistors are electronic circuits that consist of a pair of bipolar transistors (bi polar) are connected in tandem (series). This series connection is used to obtain reinforcement (gain) is high, because it results in the strengthening of the first transistor will be strengthened further by the second transistor. The advantage of the Darlington circuit is the use of a smaller space than the ordinary transistor circuit with two forms of the same configuration. Strengthening of electric current or gain of a Darlington transistor circuit is often written with the notation β or HFE.
With the configuration of HFE darlington then be obtained by:
