Questions tagged [lm386]

The LM386 is a "Low Voltage Audio Power Amplifier"

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34 views

Using diy lm386 preamp on standard commercial amp?

I have a small intercom-like device that has been siting around. It looks something like this. I suppose that inside is just a basic elect-mic and a button. Also i have an power amp which i used to ...
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1answer
45 views

Inaccurate voltage readings on an esp32 as opposed to multimeter

I am working on detecting the amplitude of a signal coming from a guitar pickup. I am using an esp32 and an LM386 module for amplifying the signal. I get quite stable readings with a multimeter, but ...
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70 views

On the LM386 opamp Module, why I am getting an output without giving input

I am using an LM386 opamp Module from Amazon. I am powering it with a 5V input (just to power it, not intending to amplify anything at this point). Nevertheless a multimeter measures an amplified ...
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2answers
84 views

10W speaker with LM386?

I have a simple question. I'm making an audio amplifier using the circuit given in the LM386 datasheet. According to the sheet, my IC can supply max 1W of output power and recommend load is 4 ohm. The ...
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922 views

(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 ...
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1answer
49 views

Difference in noise levels between inverting and non-inverting inputs of LM386

An article on Hackaday claims that the inverting input of LM386 is less noisy than the non-inverting one: We’ve also noticed, and we’re not alone, that the inverting input seems to be less noisy than ...
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2answers
73 views

FM modulation in FM transmitter

I'm using an LM386 for voice amplification. The transmitter transmits the signal from the tank circuit on the correct frequency but without voice. I'm a beginner and a hobbyist and I'm still trying to ...
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2answers
107 views

Electret microphone for ADC input

I'm currently working on a fun PCB project and have this circuit built that will input into an ATmega328P. What I'm looking for is what you guys think of this and if you think it will work. Does the ...
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1answer
179 views

LM386 circuit design questions

Initially I trawled posts and forums (initially to debug some noise, squeals, and oscillations on some LM386 circuits I built). I've synthesised all of that knowledge and re-approached this IC, ...
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1answer
80 views

Using a computer mic with lm386

I'm working on a two way amplifier/intercom for my parents to use in the car because of road noise and hearing problems. I got a couple LM386n-4 and I've tried the circuit layout from here: http://www....
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1answer
112 views

Why is my LM386 reducing voltage and not amplifying it?

LM386 datasheet. I'm working with an 8-bit, R2R-ladder DAC that is connected to the LM386 that is then connected to an 8ohm/3W speaker. The output of the DAC is connected to pin 3 of the amplifier, ...
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3answers
88 views

How to overdrive a signal?

I am planning to build this circuit below as a electric guitar amplifier. Source And I also would like to add gain control overdrive channel to existing design. I have simulated this circuit on ...
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1answer
225 views

LM386 LTSpice simulation output problem

Source I am trying to simulate this circuit before setting it up on breadboard. I have downloaded this model for simulation. And set up the circuit. After transient simulation what I get from vout: ...
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3answers
844 views

How to build a low noise MIC preamp

I want to be able to talk on the microphone of my Headset A and send that signal out to the earphones of my Headset B. Something similar to what I show you on the image below. For that purpose, I ...
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2answers
98 views

R-2R ladder connected to amplifier causes voltage to DECREASE

I'm working on a project and requires 4-bits of data from a micro-controller. I chose R to equal 1k ohms and the max V_out from the DAC (V_R-2R) without the amplifier measures around 1.6V and the ...
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55 views

What is the purpose of this jumper in this amplifier schematic or PCB?

Some time ago I bought a little amplifier kit on Banggood based on the LM386 chip. After soldering the kit I tested it, and it worked great, so I decided to buy a few more of these kits to incorporate ...
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1answer
76 views

Idea for a PC bios beep buzzer

Hi I want to make a buzzer for my PC motherboard. Similar things like this: https://boip.in/home/rajiekart-pc-motherboard-internal-speaker-bios-alarm-buzzer-1-pcs-pack?gclid=...
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3answers
212 views

How does the LM386 work?

I am not an electrical engineer, but I am curious enough and my mind tells me to make a radio circuit. Now I am into it, so to make one, I need some components, but before that so that I can be a ...
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3answers
105 views

What is making this LM386 circuit so distorted?

I found this circuit on a YouTube video and tried copying it down into a circuit for testing, but the audio that comes out of it is really low quality and distorted. I don't expect sterling quality ...
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1answer
226 views

Condenser microphone + LM386 + Arduino

I found this simple circuit and I set it up with BCM-9767P, LM386N and tried to write out the values I get. The problem is that the values seem to be constant and don't change with the environment ...
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5answers
365 views

understanding input impedance theory

The key question is, what is the best or right way to modify input impedance? I am a self-teaching novice at electronics. I'm using the LM386 as a learning platform. Signal input comes from a "...
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1answer
102 views

Understanding LM386 amplifier component selection

I am a computer engineering student and I still struggle to understand electricity. I am doing an audio amplifier project and would like to understand the math behind why these capacitor/resistor ...
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2answers
265 views

Random Electrical noise LM386

I tried to make a microphone (condenser microphone) amplifier that powers a 0.5W 8 ohm speaker using the LM386, however I have been having random noise issues. Whenever the power is connected, the ...
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1answer
132 views

Can I use one LM386 amplifier to drive 2 speakers(no stereo needed)?

Can I connect 2 speakers to the same output of the LM386 audio amplifier?
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197 views

Overheating LM386

I am still trying to build a simple audio amplifier using the LM386. I also found some older LM386 in my department, since my previous batch may be corrupted. Using this circuit I rebuilt it using a ...
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2answers
364 views

Test defect audio amplifier LM386

Following this question I wanted to check if my amplifiers are faulty. I rebuilt the schematic in the datasheet (p.10 9.2.2) and slowly increased Vin. There was no change in output gain when ...
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1answer
427 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 ...
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1answer
59 views

555 NOISE BUTTON/ OP AMP

I have this circuit from the image below that I am designing myself. part of this circuit is cut so 2 78xx is present. This circuit is being designed and tested in parts. This part of the circuit has ...
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2answers
260 views

simple LM386 amplifier noise

I tried to make an audio amp based on LM386 but the output is noisy when the audio is playing. Here is my circuit schematic I built on a solderless protoboard: simulate this circuit – Schematic ...
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2answers
1k views

Simple FM Radio Receiver project

I've been making my own simple FM radio. I know it's not quite appropriate to make this stuff on breadboard, but if it works, I'll move in on the board and solder it. I wanted to ask why my radio is ...
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0answers
87 views

Analog VU meter with 1 watt lm386 amp

I am building a small cigar box speaker with an lm386 and think it would be cool to have a working analog VU meter on the front. There are obviously a lot of cheap ones from China which I would be ...
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1answer
185 views

LM386L does not amplify the microphone signal

I've encountered a problem. I recently bought a condenser microphone and I wanted to have some fun, so that if I said something into the microphone, I'd hear myself in the small 8 Ohm 0.5W speaker. I ...
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1answer
113 views

Powering up second LM386N results in screaming squeal

So I'm definitely a newcomer in the audio electronics realm but I've been really digging into circuits and experimenting with sounds. I've been focusing alot of time working through examples that use ...
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2answers
750 views

Why is the output signal of my amplifier heavily distorted?

I checked the circuit 1 million times. I got it from a website. Everything is correctly connected. The sound is loud, but it is very distorted. I use a 9 V battery. Where is the problem? :( EDIT:I ...
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3answers
7k views

LM358n versus LM386 for audio amp

Here's the pinout diagram for an LM358 Here's the pinout diagram for the LM386: Here's a very basic circuit showing an audio amplifier created using an LM386: If I built the equivalent circuit ...
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2answers
201 views

LM386 speaker distorts

I've built an amplifier with an lm386 but when I connect a speaker (8ohm) to the output I get a very distorted signal. The problem appears only when the speaker is connected. If I connect an external ...
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535 views

Can I remove zobel network in LM386 circuit? [duplicate]

What happens if I omit this part? Actually I don't have 10om resistor and I want to know is there any alternative? ps: I know what is a zobel network. I want to know what happens if I omit it.
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2answers
837 views

Volume control for LM386

For some context, see my earlier question: Ceramic capacitor value for an LM386N project What I learned is that the 10k potentiometer on pin 3 (Vin) forms a voltage divider. When I carefully dial it, ...
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1answer
376 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 ...
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1answer
190 views

Using an LM386 with input and output transformers for isolation from power supply

The LM386 TI applications notes page 11 show an amplifier. Would like to use this chip with complete isolation of the output speaker and with the addition of an isolated input speaker. Am using ...
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2answers
1k views

LM386 motorboating that goes away with a resistor in parallel with the bypass capacitor on pin 7

I'm building a simple amplifier around a LM386. The circuit I'm using is this: The input is on pin 1 of the connector and is a square wave coming from a digital pin on a NodeMCU devboard. When I ...
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0answers
97 views

Portable Guitar Amp - Distortion, Volume & GND

I have tried following the given schematic There are 3 things I am unsure of (what I tried): The Volume 5k Potentiometer: I have tried adding a volume control to the schematic by placing the ...
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1answer
418 views

Non-inverting op amp problem

I have problem with an lm386 op amp in an non-inverting configuration. For the resistors, I take two equal resistors so i set a gain of 2. When i put a signal of 3.3 volts on the non-inverting pin, i ...
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1answer
835 views

Alternate to LM386 for 3.3V system [closed]

I'm trying control the volume of a small speaker (8Ω, 1/4W) in a 3.3V system using a potentiometer wheel (10kΩ). I've done this in the past using an LM386 in 5V systems, but the project I'...
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2answers
498 views

What happened with this LM386 Amplifier Output

yellow channel is from lm386 amp 20 times gain my circuit is from the lm386 datasheet with 16 V source, what i amplify is 40khz arduino pwm output, is there any explanation why this happened, thanks
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1answer
816 views

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 ...
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3answers
2k views

where to add gain and volume controls to LM386 guitar amp circuit?

Im trying to make a super simple guitar amp. heres the circuit using an LM386 operational amplifier: What exactly would affect gain but not volume, and volume but not gain? In the example circuit on ...
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2answers
250 views

Breadboard 9V Output vs 9V Battery

I've put together an lm386 audio amplifier circuit as shown in the image below. The volume was good when hooked up to the 9V output on my trainers breadboard, but when I hooked it up to a 9V battery, ...
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1answer
895 views

distortion with lm386 in parallel

I'm trying to make a decent audio amplifier using two lm386 wired in parallel. I used Jericho Uno's schematic (below) as a guide (link to video). My circuit looks pretty similar, but I wanted to ...
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1answer
247 views

whats up with this op-amp circuit? [closed]

Came across a few circuit components and I thought I'd have a little fun. I don't understand what's happening though. I implemented this circuit. The only differences were: I didn't have a .1uF cap, ...