![]() Many such pairs can also be integrated in one chip and can be used for high end applications in audio circuits, power supply circuits, TV & display drivers, and so on. The same circuit can be modified using a single chip where the two transistors will be connected in Darlington style. In the circuit above, two separate transistors are used to form a Darlington pair. The main principle behind this pair is to connect 2 or 3 transistors with the emitter of one transistor connected to the base of the other, and all these transistors will share the same collector. ![]() Two transistors are paired to form a Darlington transistor pair. The total current gain for a transistor pair in Darlington configuration can be calculated as Hfe1xHfe2. The current gain may jump up to a thousand times and more in most cases. ![]() A Darlington Pair is mainly used to produce a high current gain and a high input impedance. Any op amp which can be operated from a 12V dual supply can be used instead of uA 741.Īs shown in the transistor amplifier circuit above, the four transistors shown in the circuit are used to form Darlington pairs.Assemble the circuit on a good quality PCB or common board.Use a well regulated and filtered power supply for noise free operation.Jump to: Darlington Pair Transistor Amplifier Circuit Diagram with Parts List Transistor Amplifier Circuit Diagram Such a simple but stable circuit as this can produce a reasonable output of 12W on a 4 Ohm speaker. The theory may seem little awkward for you. The amplification is stabilized as a result of the negative feedback from the junction of collectors of Q2 and Q4. ![]() These voltage drops are given to the base of Darlington pairs. As the input current to the op-amp depends on the level of the signal op amp is amplifying the voltage drop across the resistors R2 and R3 will be proportional to the input signal. The voltage drop across the resistors R2 and R3, are used as the input of the Darlington pairs. The four transistors are wired as complementary Darlington’s which produces the drive for the speaker. Here the op-amp used is uA 741 which produces the required gain. The circuit shown below is not at all expensive as the amplifier contains only an op-amp and four transistors (easily available from your electronics junk box). 12 Watts Transistor Amplifier Circuit Description ![]()
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