![]() ![]() In comparison to a single transistor, it has a very high current gain.To construct a touch-sensitive button, connect it to a metal piece.It is used as a switch in a water level indicator.As power amplifiers in electronic devices like TV, computers, etc.Darlington pair circuit can also be used in Voltage regulators.It has a wide range of use as a current Amplifier.As previously demonstrated, the Darlington pair amplifier circuit can provide a significant current gain.Individual gains are ignored in the above relationship, and the total equation is approximated as,IC= IB (β1β2)Īpplications of Transistor Darlington Pair.In the preceding equation, substitute IC = β1IB + β2IB (1 + β1).However, the second transistor’s base current,IB2 = IB + IC1IB2 = β1 IB + IBIB2 = IB(1 + β1).The total current at the collector is IC= IC1+IC2IC = β1 IB1 + β2 IB2 Similarly, the next transistor’s current gain,β2= IC2/IB2, then IC2= β2 IB2.According to the diagram, the current gain of the first transistor is,β1= IC1/IB1,therefore IC1 = β1 IB1.Because there are two transistors in this configuration, the base voltage must be greater than 1.4V. ![]() In general, the base input voltage must be greater than 0.7V to turn on the transistor.When compared to a single transistor, this value is very high, resulting in a high load current. As a result, the total current gain is 10,000. The value for a standard transistor is 100. If the first transistor’s current gain is β1 and the next transistor’s current gain is β2, the overall current gain of transistors will be the product of β1 and β2. ![]() As a result, the second transistor’s emitter current is very large, which is sufficient to drive large loads.
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