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12W Amplifier Using 741 Op Amp

2015-01-02 21:17  
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12w-amplifier-circuit-using-741-op-amp



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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