LM386 Audio Amplifier


Posted on Feb 5, 2014

I picked up an LM386 Low Voltage Audio Amplifier. A little poking around and I found National Semiconductor`s data sheet, showing a schematicthat requires only 5 components for a gain of 20, and 7 for a gain of 200. Being the skeptical man I am, I built the 5 component variation and plugged in my MP3 player. I used a 9V wall transformer for power. Lots of noise resulted.


LM386 Audio Amplifier
Click here to download the full size of the above Circuit.

Well, I discovered the need for a 6th component: Big capacitor on the power supply. It`s usually a rule of thumb to have one anyway, even if you`re running off of a stable supply like a battery. This circuit is simple and effective.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    0.1Hz to 10Hz RF reciever
    Precision frequency-to-voltage converter
    Remotely-adjustable-solid-state-high-voltage-supply
    in making incandescent lamps
    12 V High current regulator
    STI5189 Low-cost QPSK Demodulator And MPEG2 Decoder For Set-top Box Applications
    Commodore 64 Cassette Interface
    IMPROVED TV COLOR WHEEL CONVERTER
    Novel White LED Torch
    dc VOLTMETER
    AC adapter circuit
    50 Watt Hi-Fi power amplifier circuit



    Top