Mini amplifier

Here is a simple project , mini amplifier built around LM1895 followed by passive components. The output of 10mW to 1W is obtained so, the circuit is called mini amplifier.
mini amplifier

Circuit Description
The output from mike or pre-amplifier is fed to pin no.4 through variable resistor VR1 and capacitor C4. Variable resistor VR1 is used to select the intensity of signal. Capacitor C2 and C6 is used to filter and develop the supply, where capacitor C3 and C5 is used to bias the audio frequency. The output of amplifier IC is obtained at pin 1 where resistor R4 and capacitor C8 is used as feedback component. The output is given to loudspeaker through capacitor C7 in order to produce sound.
Resistors (all ¼-watt, ± 5% Carbon unless stated otherwise)
R1 = 10 KΩ
R2 = 47Ω
R3 = 220Ω
R4 = 1Ω
VR1 = 50 KΩ
C1 = 470 pF
C2 = 220 µF/10V
C3 = 100 µF/10V
C4 = 0.1 µF
C5 = 10 µF/10V
C6, C7 = 470 µF/10V
C8 = 0.1 µF
IC1 = LM1895N
LS1 = 4Ω/1W speaker

7 thoughts on “Mini amplifier”

  1. Hi
    I Am confused that if I add a female jack instead of mic so there will be two point so how do I connect that and second is if I connect headphones instead of speaker will it give good response and third if I want to add bass booster in this circuit so how can I add

    Can u give me a whole circuit daigram with component list will be appreciated

    Thanks and regards
    SHah Mohammad sufayan

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