These interesting circuits and DIY projects are explained throughly with the help of schematics, working diagrams and videos.Didnt know if I was doing something else incorrectly though.).And as others have mentioned the LM386 is a power amplifier and never used for similar applications as the LM358.But, your problem is that the LM358 isnt designed to drive a speaker.
The explanation has been given several times in the other answers. Provide details and share your research But avoid Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. MathJax reference. To learn more, see our tips on writing great answers. Not the answer youre looking for Browse other questions tagged operational-amplifier audio lm386 or ask your own question. For example, you can connect the grounds for the power supply, input, and output directly to the ground pin (pin 4) of the LM386 like this: This will reduce the distance the input ground flows through the output ground. I built about a dozen different audio amplifier circuits with the LM386 but most of them had way too much noise, popping, and other interference. Lm358 Amplifier Circuit How To Build ItFinally I found one that sounds great, so Im going to show you how to build it. ![]() Lm358 Amplifier Circuit Download My PartsBut before we start building, it might be helpful to get a little background information first BONUS: Download my parts list for the LM386 amplifier with bass boost circuit to see which components to use for good sound quality. Only a couple resistors and capacitors are needed to make a working audio amplifier. 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. There are three varieties of the LM386, each with different output power ratings: LM386N-1: 0.325 Watts LM386N-3: 0.700 Watts LM386N-4: 1.00 Watts The actual output power you get will depend on your supply voltage and speaker impedance. The pinout is shown in the diagram below: Download the datasheet for more information about the output power, distortion characteristics, and minimummaximum ratings: LM386 Datasheet The LM386 is a type of operational amplifier (Op-Amp). They take an input potential (voltage) and produce an output potential thats tens, hundreds, or thousands of times the magnitude of the input potential. In an amplifier circuit, the LM386 takes an audio input signal and increases its potential anywhere from 20 to 200 times. Gain vs Volume After you build this amp and play with the volume and gain controls, youll notice that both appear to raise or lower the intensity of sound coming out of the speaker. So whats the difference then Gain is the amplification of the input potential and is a characteristic of the amplifier. Volume lets you adjust the sound level within the range of amplification set by the gain. For example, if your gain is set to 20, the range of volume is 0 to 20. Gain control can be achieved by connecting a 10 F capacitor between pins 1 and 8. Without a capacitor between pins 1 and 8, the gain will be set to 20. Lm358 Amplifier Circuit Series With TheThe gain can be changed to any value between 20 and 200 by placing a resistor (or potentiometer) in series with the capacitor. A Minimal LM386 Audio Amplifier Now that we have a little background information on the LM386, lets start by building a bare bones LM386 amplifier with the minimum amount of components needed to make it work. That way you can compare it to the better sounding one well build later on. Heres the schematic: Heres how to wire it if youre using a breadboard: In the wiring diagram above, the audio input ground flows through the same path as the audio output ground. The output ground is noisy and will cause distortion in the input signal if its wired this way. The audio input ground is sensitive to any interference and any noise picked up will get amplified through the amplifier. Make it a goal to keep the input ground separate from other ground paths as much as possible.
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