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LM386 audio amplifier circuit with PCB

This is an audio amplifier that can use with a small 9 volt Battery Operated, Current use as little as 5 milliamps. And amplification up to 500 mW. Which is sufficient to expand the sound from a sound about or the CD Walk Man out to the small speakers clearly. When entering the power supply 9-volt circuit IC1 number LM386 amplifier IC size is 300-800 mW, Depending on the power supply circuit with, This is from 4-15 volts.

LM386 mini audio amplifier circuit


Figure 1 the LM386 mini audio amplifier circuit

Once entered into the input pin 3, The non-inverting pin to amplifier non-return phase.C1 will be served cut out the noise input to ground, and C2 increases the rate of the amplifier, C2 is to add more value.

But if the C2 Too much distortion (the C2 should not exceed 100uF).

The output of IC1 is out of the pin 5 through C4 coupling audio signals to better and DC block and not passed to the speaker.

For the audio portion will also be fed back through R2 and C3 to the high-frequency response better.

How to builds
This circuit, you can easily make it with see PCB layout and the components layout in Figure 2

lm386-audio-amplifier-pcb-layout
Figure 2 the PCB and components layout of the LM386 audio amplifier.

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Next circuit ideals that use LM386 IC.

LM386 Small Power Amplifier use 9V battery operated

LM386 mini amplifier

500 mW Power Amplifier using LM386N

This circuit number LM386 IC is used as the IC, which is popular is that it has. It is a simple circuit. Fewer equipment items. Suitable for use or used in small trials.
The properties of the IC can be used from the 4V-12V power supply for low current at 50 mA only. And the frequency response from 40Hz – 100 kHz rate of expansion of 46 dB and distortion.
Less than 1%.

500 mW Power Amplifier using LM386N

When entering the power supply light LED1 circuit to tell the operating environment of the circuit. C6 and C7, with a page filter to smooth then be entered through one input sound signal.
C1 coupling signal protection dc voltage noise in the circuit to the sound signal that is transmitted through VR1 for controller level reputation of the sound signal and then sent to the input to pin 3 of IC1.
boost up output at pin 5 through C5 for protection dc voltage and meet the low frequency better and send output speakers. The C4 and R1 are acting eliminate noise signal out and the pin 1 of IC will have a jumper for. to access the C3 to boost up rate increase in case the circuit to be used to boost up signal is very small.

This Post Has 14 Comments

  1. Hi, I want to know how to give input, and can I use 3.5mm jack to input and use it with mp3 player

  2. How to give input plz tell fast????

  3. Hi,Shital
    Thanks for your feedback.
    You can use input for any low audio, example: CD audio, MP3, others.

  4. Hi! nice site i would like to ask ..Where i can find the block diagram or schematic diagram for making amp for tweeter and low driver

    High > need amp driver
    Mid > already have sound standard ex1200
    Low > need amp driver

  5. sir,pls tell me how to give input …???

  6. What is the size of this pcb?

  7. hello my name is mike , i am working on the project using the 555 ,but can anyone tell me which pin is whih and wheres does everything connect to because i have no idea where to connect each component to its belonging pin, if anyone can help please comment as soon as possible, thank you

  8. Hai can we connect two stage ic lm386 amplifier please send me circuit diagram of it to connect these stage with filter circuit and you site give very simple circuits thangs send me answer in my mail

  9. Hi shubhendu,
    Thanks for your visits.
    Please ser printer the pcb layout on 300dpi per inch.

  10. That was great.
    Tanks

  11. great …..!!!!!!!!!!!!!!!!!
    useful …… give a info for the audio amplifier using blootooth connector without audio jack

  12. email me small audio amp circuit

  13. i ve a 8 ohm 4 watt speaker what value of capacitance would i ve to use as zobel capacitor? when i searched through the net i found it to be inducatance/resistance^2 So actually how do i khow the henry of the speaker

  14. how to generate 85 dB sound?

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