Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [lm386]

The LM386 is a "Low Voltage Audio Power Amplifier"

The LM386 is a "Low Voltage Audio Power Amplifier".

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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? For an audio application, should that be a…
DuckTyped
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How does this LM386 circuit boost bass?

I'm just starting out in Electrical Engineering and was wondering if anyone could clarify a question about the following RC circuit regarding the LM386. My question is about the following circuit: How has adding such a small value cap (between pins…
kp122
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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 the operating voltage range of the LM386 as per…
Irfan
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LM386 amplifier circuit

I am building an audio amplifier with LM386 with a voltage supply of 5 V. The input signal is 50-250 mV. Can anybody tell me why there is a resistor and capacitor in series at the output? As the value of this resistor is 10 ohms, will it draw some…
Mudassir Ahmad
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How can LM386 follow a signal when it becomes negative?

Here is a picture from the datasheet of the LM386. Obviously, the input signal is swinging above and below the ground, but pin 4 is not connected to a negative supply. It is connected to the ground (while pin 6 is the positive supply.) How can this…
MikeTeX
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(How) does LM386 allow an input past its negative rail?

I am confused by the LM386. In the data sheet, multiple examples connect the inverting input directly to ground. To me, that feels weird. How can the IC amplify if the input goes below GND? The data sheet goes on: when left unconnected (or AC…
polwel
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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 a lot of noise and the sound quality quickly…
Markovian8261
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Is a minimum of 1000µF capacitance needed between an lm386's output and a speaker and if so why?

In this video explaining how to make an audio amplifier, the narrator warns Don’t be misled by crappy schematics…with low values like 100 µF. You want to use at least 1000 µF [between the LM386's output and the speaker] to guarantee good bass with…
cheaterpushups
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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 supply and I'm trying to keep the design small, I've…
Jim
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LM386 guitar practice amp circuit not working, need help finding mistake

I'm very new to electronics and I built this guitar amp circuit on a breadboard: and it was working really nicely. Now I've decided to put the circuit on a universal PCB which I'll use in the actual amp. I soldered all the components on but no…
TwoheadedFetus
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LM386 amp circuit lag

I'm building a motorcycle intercom and am using the LM368 IC for my amp. My circuit works well (surprisingly, I'm new to this). I've got a button which I use as a push to talk switch. This works for the most part, however when I press the button it…
Ben Everard
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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, is this capacitor used as a high pass filter, so…
electricviolin
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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 microfarad capacitor and the 10 ohms resistor. At…
T555
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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 it at best. I guess I could stick a series…
DuckTyped
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Distorted lm386 circuit output waveform

For one of my electrical engineering labs, we are required to build an lm386 circuit with a gain of 40, then measure its frequency response. I have successfully done the first part - I get a gain of 43 at low frequency (~100 Hz). Diagram: The…
geniass
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