Questions tagged [lm386]

The LM386 is a "Low Voltage Audio Power Amplifier"

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7
votes
5answers
6k views

Is this a suitable sine wave osc? how would I control the frequency?

Overview- I'm making a bank of analog sine wave oscillators and I'm interested in keeping the design compact. I've started by making a Wien Bridge oscillator. As I'm working from a single power ...
5
votes
2answers
511 views

Simple LM386 Circuit RC Branch Question

Please take a moment to checkout at the LM386 circuit below. The circuit comes directly from the LM386 specifications document: My question revolves around the output branch consisting of the 0.05 ...
10
votes
7answers
23k views

LM386 audio amplifier not amplifying

This is my first attempt at making a really simple audio amplifier. The schematics are below:- First I tried connecting the circuit to a 9V battery. (Multimeter reads around 8.3 Volts, which is in ...
12
votes
1answer
3k views

Fully understanding LM386 datasheet minimum parts example

I'd like to fully understand the circuit marked as "Minimum Parts" at page 5 in LM386's datasheet: Is there any reason for 10k resistance at the input potentiometer or is it just an arbitrary value? ...
2
votes
2answers
13k views

What potentiometer should I choose?

I want to create a sound amplifier with the LM386 and I need a potentiometer. I don't have a clue what I'm doing (:P) but I've printed out the datasheet (for the LM386) and had a look at it. So I ...
7
votes
2answers
30k views

How to improve lm386 amplifier circuit

I am new to the world of audio amplifiers however i am quickly trying to learn. I have built a simple circuit using a circuit based on what I read in the database. The circuit works however there is ...
2
votes
4answers
12k views

How to decrease distortion/noise of LM386 amplifier at max gain and volume?

From my previous question, I've made LM386 amplifier and it works better than LM1458 amplifier. I've added gain and bass boost in my LM386 amplifier. How to decrease distortion/noise of LM386 ...
4
votes
4answers
8k views

Why is microphone + opAmp + Arduino circuit not working?

I followed the mic + op-Amp part of this schematic exactly using an Lm386 chip: https://randomskk.net/projects/lightstrip/schematic.pdf and sent the output from the op-amp into a pin on an Arduino ...
2
votes
3answers
11k views

Alternative to LM386? To drive 8 ohm speaker with 9V circuit

I am getting pretty tired of debugging the LM386 integration into my project! I'm building a drum machine, based around schmnitt trigger oscilators and a white noise generator. I'd post the complete ...
6
votes
2answers
4k views

Audio from Arduino Due's analog outputs using LM386

Due's DACs provide 0-3.3v (actually less) and are rated at 3mA max. As far as I know, common speaker/headphone impedances range from 8Ω to a few hundreds, so driving these from the DACs will destroy ...
6
votes
2answers
2k views

What is the purpose of the 250uF capacitor in the LM386 circuit?

The basic amplification schematics shown in the LM386 datasheet shows a 250 uF capacitor in series with the output. I don't have any 250 uF, but I do have plenty of 470uF. If I understand correctly, ...
2
votes
1answer
213 views

Ceramic capacitor value for an LM386N project

I am adding an LM386 to a music project and follow the guidelines in the datasheet: My Vs is 4.7 V. My Vin comes straight from a 12 bit DAC of a Cortex M3 MCU and goes from 0 to 3.3 V. Pin 7 is ...
1
vote
1answer
3k views

Maximize performance LM386 and 4Ohm speaker

I'm designing a very simple circuit which contains a microcontroller, an LM386 and a speaker. I've previously asked a question:Help in designing a speaker driven by an LM386 and the answers helped ...
1
vote
2answers
435 views

Not understanding aspects of the LM386 amp

For the following LM386 amp i have a couple of questions. Is C3 and R1 a low pass filter and if so how do i calculate the cutoff frequency for it? I.e. do i have to take the impedance of C2 into ...
0
votes
1answer
78 views

Microphone with LM386

I am trying to build an audio amplifier circuit based on this design using an LM386 opamp. On the output side (pin5) an Arduino is connected constantly reading out the pin ...