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Audio amplifier for portable radio receiver

This is a simple audio amplifier circuit fabricated around BEL1895 1W audio amplifier IC. This circuit is alternative of the complicated audio amplifier circuit for portable radio receiver. No driver circuit for loudspeaker is needed with the facilities of wide range of supply voltage (VSS) 3V to 10 V. The feature like to obtain high sensitivity and good S/N ratio in AM receiver makes this audio amplifier for portable radio receiver versatile.

simple audio amplifier

PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R1 = 390 Ω

R2 = 100 KΩ

R3 = 1 Ω

R4 = 56 Ω

Capacitors

C1, C6 = 0.1 µF

C2, C8 = 470 µF/6.3 V

C3 = 100 µF/6.3V

C4 = 10 µF/6.3V

C5 = 330 pF

C7 = 220 µF/6.3 V

Semiconductor

IC1 = BEL1895

Miscellaneous

LS1 = 4 Ω speaker

 

 

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