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


Resistors (all ¼-watt, ± 5% Carbon)

R1 = 390 Ω

R2 = 100 KΩ

R3 = 1 Ω

R4 = 56 Ω


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


IC1 = BEL1895


LS1 = 4 Ω speaker



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3 thoughts on “Audio amplifier for portable radio receiver”

  1. Excellent items from you, man. I have be mindful your stuff prior to and you’re simply too magnificent. I actually like what you’ve received right here, certainly like what you are saying and the way by which you assert it. You make it enjoyable and you still care for to keep it smart. I can not wait to learn far more from you. That is actually a wonderful web site.

  2. the circuit is good but if it will be possible i would like to know about Frequency Shifting Key (FSK) circuit and how it operate

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