12W Amplifier 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

R1 10KΩ
R2 4.7KΩ
R3 270KΩ
R4 1KΩ
R5 1KΩ
R6 47Ω 1W
C1 50 Pf
C2 0.01 µF
T1 BC178
T2 2N6107
T3 AC108
T4 2N5294
IC LM741
LS1 50W 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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