🔊 How to make an LM386 audio amplifier circuit

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Cites tangrs · 2017-02 · Electrical Engineering Stack Exchange · on “Driving LM386 with signal referenced to virtual ground”

I'm working with a chip that outputs audio signals to headphones that are referenced to a virtual ground. Since I'm connecting the audio signal to a speaker instead of headphones, I'd like to implement a basic audio amplifier on the same board (sharing the same power source and ground). I'm thinking of using an LM386 since they're a jellybean part. However, I'm not sure how I would go about doing this. I've read the data sheet of the LM386 but the application notes don't really go into handling a virtual ground. The virtual ground is roughly 1.2V when referenced to actual ground and can source/sink about 150mA before it goes into short circuit protection mode. All the circuits I've come acro

Cites cheaterpushups · 2017-04 · Electrical Engineering Stack Exchange · on “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 [this video] , the narrator warns [this video] 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 a wide variety of speakers. However, in the circuit that I made following this video's instructions, replacing a 1000 µF cap with one of lower value resulted in no difference in sound quality which was audible to me. Is the assertion that a capacitor of 1000 µF or higher is necessary true? If so, and if the reason is that given in the video of allowing for "good" bass, how does such a capacitance allow for that? If this is not the

Cites shihao Chen · 2017-09 · Electrical Engineering Stack Exchange · on “How does a LM386 audio amplifier become to a radio receiver?”

Recently I made an audio amplifier by following this video( [this video] ). The interesting thing is that when I plug the battery in, suddenly I received a very clear radio signal and the audio input acts like a antenna. Can anybody tell me what is going on here? [LINK]

Cites ifconfig · 2018-10 · Electrical Engineering Stack Exchange · on “Is there a difference between specialized audio amplifier and general op-amp silicon?”

I've been doing some research into creating a DIY audio amplifier from line-level inputs to speaker level power. I found a guide centered around the LM386 Low Voltage Audio Power Amplifier [LINK] on [this video] . I have a fairly large collection of DIP package TTL logic and alike that I inherited from my father, which I am hoping to make use of in this project. I did some research, and it appears that the LM386 is just a specialized op-amp with desirable characteristics for audio signal amplification. I located an LM324N op-amp [LINK] in my collection, which looks to my incredibly untrained eye to have similar characteristics to the LM386. However, seeing how I have a rudimentary understanding o

Cites Phildo · 2020-02 · Electrical Engineering Stack Exchange · on “Made a simple mono amplifier (LM386) circuit, and it stopped working. How can I debug individual components?”

Note- I'm a programmer, not an electrician. I'm replicating the circuit found here: [this video] (circuit @ 4:50) [LINK] I've soldered two identical PCBs, and when hooked up to a speaker, both worked great! However, I was testing the functionality by loosely touching the speaker input to the output of the 1000uF capacitor on one of the boards (and it was working!), when my finger slipped and I think the speaker input wire grazed some other component on the PCB. I heard a small pop in the speaker, and when I hooked it back up, it didn't work anymore (silence). I tested the speaker with the other PCB, and it's still working fine. What might be wrong with my circuit? How can I debug this without ess