Voice Amplifier

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Rs. 1,500.00
Ex Tax: Rs. 1,500.00
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  • Brand: Orion iTech Solutions
    Product Code: SB01/EC107

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    The circuit can be housed in the box containing the speaker to form a handy microphone amplifier. The device can be used by teachers, guides, lecturers etc. for speaking in a crowdy or noisy environment.

    The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low. The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milli watts when operating from a 9 volt supply, making the LM386 ideal for battery operation.

    The circuit is based on the audio power amplifier. The IC can deliver a maximum power output of 1.2W at a +9V power supply. The audio signal from the microphone is pre amplified by the amplifier (BC547). The capacitor is used to bye pass the upper frequencies in order to avoid the Larsen’s effect (the microphone picking up speaker output to cause howls).

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    Q1.Why we are using this OP amp IC (LM386)?
    Ans1. The LM386 is a power amplifier designed for use in low voltage consumer applications. So used for amplification of audio signal.
    Q2. Which microphone we are using in this project?
    Ans2. The microphone we are using in this project is 
    Q3. What is the logic behind grounding of terminal of speaker and the mic?
    Ans3. The terminals of speaker and mic is grounded to avoid any interference of noise.
    Q4. What is the maximum power output of the IC(LM386)?
    Ans4.The IC can deliver a maximum power output of 1.2W
    Q5. Why capacitance is used in the circuit near microphone?
    Ans5. The capacitor is used to bye pass the upper frequencies in order to avoid the Larsen’s effect(the microphone picking up speaker output to cause howls).