12W Amplifier Using 741 Op Amp

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12W Amplifier Circuit Using 741 Op Amp

A 12 watt audio amplifier operating on a dual symmetrical supply of ± 12 volts. The 741 provides the required gain while the speaker drive is provided by the complementary Darlingtons T1, T2 and T3, T4.

12w amplifier circuit using 741 Op amp IC

PARTS LIST
R110KΩ
R24.7KΩ
R3270KΩ
R41KΩ
R51KΩ
R647Ω 1W
C150 Pf
C20.01 µF
T1BC178
T22N6107
T3AC108
T42N5294
ICLM741
LS150W 4Ω

The input signals for the darlingtons are derived from the supply current of the 741. Since R6 is connected to the ground, the positive or negative signal currents also pass through R4 or R5. The voltage drop across these resistors serves as the input signal to the transistor pairs. An overall dc negative feedback from the common collector junction of T2 and T4 stabilises the dc conditions of the circuit and keeps the junction point at zero volts. Hence, no coupling capacitor is required for the speaker.

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Comments (23)

  14. i have made this circuit,the only problem i faced is to find transistors in pakistan other then that the cct workes if i apply vin 2v it amplifies up to 10.5 v with a lot of noise thats the only problem other wise i works great.

    Reply

  17. Beautifull job indeed! Thanks for the post! Could I have TIP102/107 instead of darlingtons you have on your project? Any design considerations? Thanks! (sorry about my bad english. I am brazilian) Renato

    Reply

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