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Consumer Electronics by S. P. Bali

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PRACTICAL CIRCUITS USING IC-BEL 700

Figure 20.11 illustrates the circuit of a 1 watt audio amplifier using IC-BEL 700. When IC-BEL700 is used in audio applications, only the a.f. portion of the IC is utilised. This part of the IC contains an audio preamplifier, audio driver, stabilisation circuit for quiescent current and a class B output stage.

The class B audio output stage can provide a minimum power of 1 Ω into an 8 Ω load at 9 V; or 0.5 W into a 4 Ω load at 6 V; or 0.4 W into an 8 Ω load at 6 V; or 100 mW into a 4 Ω load at 3 V This stage is designed to operate with a guaranteed minimum supply voltage at 2.7 volts and upto a maximum limit of 12 volts.

The audio input signal from the volume control is connected to non-inverting input terminal ...

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