Lm386 low voltage audio power amplifier datasheet rev. Audio is one of the most entertaining, timeconsuming and eventually walletdraining ways of learning about and falling in love with electronics. This neat little readymade module provides a gain of 200. May 15, 2019 here we are going to discuss the simple amplifier based on the ic of lm 386. Grove sound sensor based on lm386 amplifier arduino. There are many lm386 circuits online similar or equal to the one you linked, some with a few skews and improvements but all are based on the manufacturer datasheet.
Now, click on upload and get ready to play your audio files. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200. The main advantage of this ic is its bass boost function with the addition of only two external components. The 386amp audio amplifier can be connected to a mic or. Its gain the amount it can amplify an input signal is capped at 200x. However, you need to know functions of every pins before it can work better for you. An arduino connected to a speaker via a simple lm386 audio amplifier turns into an old school beeper. The lm386m1 and lm386mx1 are power amplifiers designed for use in low voltage consumer applications. I have no cap on the gain pins, so its internally set to 20. Overcome by nostalgia from the spectrum times, i programmed the sailors hornpipe tune badly.
This project shows how to build an audio amplifier based on lm386 ic. Add a 10uf capacitor between pin 7 bypass and ground. The circuit is very simple and construction is easy on a breadboard. The complete program of the arduino music player project is given at the end of this article, simply copy it and paste it in the arduino program. Low voltage audio power amplifier, lm386 datasheet, lm386 circuit, lm386 data sheet. If a capacitor is put from pin 1 to 8, bypassing the 1. Spice model lm386 electronics forum circuits, projects and. Its gain is internally set around 20 but due to the external resistor and capacitor gain can vary between 20 to 200. May 15, 2011 im building this lm386 audio amplifier as part of my 8th grade nobel prize sound detector project, in the sound detector you need a electret condenser mic as input on the lm386 audio amplifier built on breadboard wired to an arduino uno which processes the electric signals, then the arduino is programmed to turn on an led. A lm386 amplifier may behave quite erratically on a breadboard.
Circuit diagram of the lm386 based audio amplifier is shown in fig. The circuit you have supplied shorts pins 1 and 8 with a capacitor, which according to the data sheet sets the lm386 to its maximum gain x200. How to connect a lm386 audio amplifier chip to a circuit. If you have a stereo application, then you will need to buy two modules, however a single module is useful if you were experimenting with transistor radios. Lm358 opamp electret amplifier circuit jungletronics medium. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to. With a few components, you can easily assemble a super amplifier using the lm386 ic. Build a great sounding audio amplifier with bass boost from. Onboard 10k adjustable resistance, you can adjust the volume of amplification. Here is a simple lm386 based audio amplifier circuit with the authors prototype shown below.
Electro tech is an online community with over 170,000 members who enjoy talking about and building electronic circuits, projects and gadgets. In this video i test and try to blow up a cheap lm386 audio amplifier module through overdriving. Lm386 snas545c may 2004revised may 2017 lm386 low voltage audio power amplifier 1 1 features 1. Simple arduino audio player and amplifier with lm386 adding sounds or music to our project will always make it looks cool and sounds much more attractive. The circuit consists of 1 electrolytic capacitor and a ceramic capacitor, resistor and one 10k pot. This amplifier consists of 8pins where pin1 and pin8 are gain control pins of the amplifier, and this ic is most widely used ic that allows a customer to increase volume. Instead, he drew up a simple schematic that used an arduino nano, an fm radio module based on the tea5767, and an audio amplifier based on the lm386. Find these and other hardware projects on arduino project hub. Simple arduino audio player and amplifier with lm386 use. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value up to 200. The gain of the amplifier is given by the capacitor connected to pin 1 and 8 of the lm386. The complete circuit diagram is shown in the image below.
Reproducing, recording and amplifying audio gets you up close and personal with the electrons rocke. Circuit audio power amplifier circuit ic lm386 pcb. Chips are pin has been drawn, you can directly input audio signal. It is assumed to be ideal for the battery operation when operating around 6v. Make a great sounding lm386 audio amplifier with bass boost. Gain is controlled between pins 1 and 8, if both are left disconnected, the default gain is 20 output voltage is 20x input voltage, or 26db the datasheet has the info on changing the gain, as well as an internal schematic that shows how a capacitor between pins 1 and 8 change the gain, as well as several example circuits. The receiver is a bit more complex, requiring a lm386 amplifier and lm393 comparator to create a clean signal for the second arduino to read. Circuit diagram for this arduino audio file player is simple.
With the 10 f capacitor the gain is set to 200, without the capacitor the gain is 50. Fitting of diy, great for arduino diy project, exercise your hand and brain. It can be used to detect whether theres sound like the sound of clapping, noise, etc surround or not and output the sound strength of the environment. Audio amplifier module lm386 amp arduino compatible this 386amp audio amplifier module has 20 voltage gain and uses the national semiconductor lm386 audio power amplifier chip. Here we are going to discuss the simple amplifier based on the ic of lm 386. It is a very low cost audio amplifier and can power any speaker. Lm386 low voltage audio power amplifier general description the lm386 is a power amplifier designed for use in low voltage consumer applications.
After you build this amp and play with the volume and gain controls, youll. May 19, 2015 an arduino connected to a speaker via a simple lm386 audio amplifier turns into an old school beeper. Lm386 audio amplifier module high gain open impulse. Lm386 audio amplifier and proper ground layout duration. The pcb printed circuit board is provided with the diy kit and it needs to be soldered, hence the name diy kit. In this project, we will show you how to build lm386 audio amplifier circuit. Voltage gain simply means that voltage out is 200 times the voltage in. Jul 22, 2016 in this video i test and try to blow up a cheap lm386 audio amplifier module through overdriving.
For me, adding the c5 and c7 capacitors was decisive in getting rid of the arduinoinduced noise. With the potentiometer you can control the volume of the amplifier. Lm386 is a power amplifier used for low voltage application requirement. For me, adding the c5 and c7 capacitors was decisive in getting rid of the arduino induced noise. Add this zip file into your arduino ide by selecting sketchinclude library add. Lm386 low voltage audio power amplifiers ti digikey. The gain of the amplifier is given by the capacitor connected to pin 1 and 8 of the.
I am trying to build one of the example circuits in the lm386 datasheet any of the first 3 but with a gain of 40 rather than 20, 50 or 200 i understand that the gain is controlled by the impedance between pins 1 and 8 and that a smaller impedance results in a larger gain. It removes any dc offset from the output of the lm386 amplifier and only passes the ac sound signal through. Simple arduino audio player and amplifier with lm386. Diy electronic kit lm386 super mini audio amplifier diy kit suite trousse lm386 amplificador module board 3. The arduino and sd card communicate using the spi communication protocol. Top 10 most dangerous airports in the world 2019 duration. Lm386 is a low voltage audio amplifier and frequently used in battery powered music devices like radios, guitars, toys etc. The gain range is 20 to 200, gain is internally set to 20 without using external component but can be increased to 200 by using resistor and capacitor between pin 1 and 8, or just with a capacitor. There are three varieties of the lm386, each with different output power.
Zip library as shown below and select the zip file that we just downloaded. The lm386 amplifies the sound input into it by a factor of 200. In the 6v power supply, its static power consumption is only 24mw, the module is suitable for batterypowered. As we know our audio files are saved into the sd card, hence we interface a sd card reader module with our arduino. Improve sound detection with adc via lm386 amplifier arduino. The lm386 ic is unique in that the gain can be modified by changing resistor r2 and capacitor c2. Gain control to make the lm386 a more versatile amplifier, two pins 1and 8 are provided for gain control. For the cost and size of the circuit, the sound from the lm386 audio amplifier can be adequately loud. But instead of a clipped 5v output, i get a 1 vpp sine wave out exactly what i am putting in. The default gain of the lm386 audio amplifier is 20 because of the 1. Im building this lm386 audio amplifier as part of my 8th grade nobel prize sound detector project, in the sound detector you need a electret condenser mic as input on the lm386 audio amplifier built on breadboard wired to an arduino uno which processes the electric signals, then the arduino is programmed to turn on an led. Lm386 wide input voltage low power audio amplifier with. The lm386 pinout diagram is as shown in the picture below. Shop all products lm386 audio amplifier module high gain high gain audio amplifier based on the lm386 integrated.
It could be used with a raspberry pi, or even an arduino project where. I use the function generator to push a 60 hz, 1 vpp sine wave into the input. Texas instruments lm386 are power amplifiers designed for use in low voltage consumer applications. When using the lm386 with higher gains bypassing the 1. The chip has options for gain control and bass boost, and it can also be turned into an oscillator capable of outputting sine waves or square waves. Download my parts list for the lm386 amplifier with bass boost circuit to. May 04, 2017 in this project, we will show you how to build lm386 audio amplifier circuit.
Especially if you are using an arduino and you have lots of pins free, you can easily add sound effects to your project by just investing in an extra sd card module and a normal speaker. Lm386 based audio amplifier full project with circuit available. Lm386 audio amplifier module high gain high gain audio amplifier based on the lm386 integrated. Audio amplifier module lm386 amp arduino compatible. Only a couple resistors and capacitors are needed to make a working audio amplifier. Here, in the above diagram lm386 audio amplifier circuit using transistors, r1 is a potentiometer, which is used as a volume control for the audio signal. Learn more about this 200 gain amplification configuration for lm386. Lm386 snas545c may 2004revised may 2017 lm386 low voltage audio power amplifier 1 1 features 1 battery operation minimum external parts wide supply voltage range. Lm386 datasheet and pinout low voltage audio power. Lm386 audio amplifier circuit with proteus simulation elexfocus. Simple arduino audio player and amplifier with lm386 circuit digest. Oscillation can turns familiar sounds into the unrecognizable. The lm386 is an audio amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external.
Lm386 based audio amplifier full project with circuit. An arduino sound sensor based on the power amplifier lm386 and the electret microphone. It has a default gain of 20x meaning it will multiply the voltage it receives on the input by 20 times, passing this through to the output. Bistable multivibrator using ic 555 timer speed control of dc motor using arduino applying pwm. In this tutorial, ill first show you how to make a basic audio amplifier with an lm386 ic to demonstrate the minimum parts needed to build a functional amplifier. To make the lm 386 more flexible, two pins 1and 8 of the audio amplifier are provided for gain control and gain adjustments. The ic lm386 audio amplifier consists of 8pins where each pin of this ic is discussed below.
It could be used with a raspberry pi, or even an arduino project where amplification is required. Lm386 chip comprises of 8 pins where, pin 1 and 8 denotes the gain control of the amplifier, and you can adjust the gain by placing resistor or. C5 improves the stability of the lm386 amplifier to prevent problems such as oscillation. Build a great sounding audio amplifier with bass boost from the. Once you get proper sound at the output, you can always pump up the gain. Keep all components as close to the ic as possible. It is built around popular amplifier lm386 ic1, an 8ohm, onewatt speaker ls1, four capacitors and a few other components. Build a great sounding audio amplifier with bass boost. Lm386 gain calculator internal external effective internal r4.
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