12W Amplifier Using 741 Op Amp


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 ic

PARTS LIST

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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