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I added a bunch of extra capacitors to reduce the noise, and I added a bass ,m386n-1 control as well to make it sound even better. The LM is quite a versatile chip.
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. The actual output power you get will depend on your supply voltage and speaker impedance.
The datasheet has graphs that will tell you. I used a 9V battery for the power supply and it works great, but you can go down to 4V or up to 12V. The LM is a type of operational amplifier Op-Amp.
Operational amplifiers have a basic task. 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 If your gain is set tothe range of volume is 0 to Make it a goal to keep the input ground separate from other ground paths as much as possible. For example, you can connect the grounds for the power supply, input, and output directly to the ground pin pin 4 of the LM like this:.
Keeping the wires as short as possible will also help. A cool feature of the LM is the option to add an adjustable bass boost to the amplifier. The bass boost is basically just a low pass filter, and it removes most of the noise not taken out by the decoupling capacitors. Hope you had fun experimenting with these amps as much as I did. Be sure to subscribe to keep updated on our posts as soon as they are published. And feel free to leave a comment if you have any questions or need help with anything in this article.
Great little article, thanks.
BTW the number sure do bring a lot of old memories back. My first pc,40mhz with 4mb ram. Some how I miss old dos, in some ways it was less complicated back then. Thanks yaboc, glad you liked it. I used the LMN-1, but the setup would be the same for each model, the main difference being the power output.
Hi Sipan, to connect the amp to my iPhone, I cut into an old pair of headphones: Sir you can use a 3. Hi Sanjeev, double check to make sure everything is connected properly, and the polarity of the electrolytic capacitors are correct…. Hi I was wondering about this amp are those mono amps? Thank you for sharing! Hi, thanks for nice tutorial.
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So my question is LM can work with 3. Hi Onur, according to the datasheet, the LMN-1 has the lowest datxsheet voltage requirement, which is 4 volts… So a 3. Will you be kind enough to email it to me? Please send me the schematic diagram. I have a question about that 0. And what are the voltages of capacitor that you used? That capacitor can go either way…no polarity…if the diagram has a capacitor, with a curve in it, it has to be put in the right way…or has polarity.
The reason is that there is always an outer shield, with film caps. In other words, dahasheet are two foils that are rolled together and the foil that ends up on the outside should be connected to eatasheet negative, because that relatively large area of metal foil picks up interference, which results in noise in an amp. You need an oscilloscope to measure this.
The circuit operates at 9V, so any capacitor voltage rating above about dztasheet will work fine. Thank you so much.
So well documented and illustrated compared to other tutorials out there. As an old Pensioner 72 just starting out in electronics I have completed my your first amplifier. Thanks for an exceptionally clear tutorial. I will now attempt the second version. As a request, would you not like to attempt a oscilloscope using an arduino uno with the same clear instructions Thanks again Roy.
I usually just double the voltage for the circuit…. I just want to ask if you can send me a copy of the schematics because im not used to bread boards which is I am really ashamed of, LOL. I want to rebuild the 1st circuit with the pin 1 connected on the pin 8. And BTW, nice work!
Really the gain is very high superb earlier i was thinking to increase the volume. After seeing this site i wondered LM N-4 is a great chip. Dear Alex the same circuit u can use by connecting pin 1 and 8 with jumper works well with 3. Thanks to circuit basics. I tried even there is clear voice.
Hi Alex, this amp works great for headphones… Datashheet the diagrams in the post are mono amps, all you need to do is build two amps, one for the right channel and one for the left channel. I used an 8 ohm speaker, but anything from 4 to 16 ohms will work. Keep in mind though, higher voltage rated capacitors are larger and more lj386n-1. Do you need a picture of the circuit? Oh btw, i was trying to make the minimal lm aduio amplifier. Cant seem to figure out what is wrong cos i followed the diagram exactly without success.
Check out our tutorial on the TDA, it has about 12 watts output power: Could you post a link to the video? My problem is that when I try to mount it in its intended case Altoids tin the signal goes out and I get no sound. I may just try to use a plastic enclosure, but I put a lot of effort into setting up the Altoids tin just right. The only diagrams I have are already included in the article. Thanks for nice explaination. I am interested in recycling my old notebook speakers 2watts each to make a usb driven amplifier with 2.
Please let me know what modifications I need to apply to your circuit. I have tried others circuit regariding this LM and this is the best circuit i can say but just wondering can i use a 3. Yes, you can use a 3. To use it as a mic pre amp, you would connect your mic to the input of the amp, then instead of having a speaker connected to the output, you would pm386n-1 the output to your recording device.
For that you would need to build a tda or tda amp. Check out these articles:. Hey, um this really is one of the best datsaheet i was just wandering that is this an 8 ohm speaker used? Any suggestions on whether the audio signal can just be parallel or darasheet I need separate audio signals? Thanks in advance for helping already getting far dataaheet building it. Hi, I am doing an audio amplifier but with 3 outputs instead of single output…so what should i add to make it work.
Hi, In one part of the circuit there are two decoupling caps connecting the positive rail to ground. One of those caps is datssheet 0.
Then there is a 0. I know very little daatasheet electronics, but to me it seems that the 0. Is it a mistake, or should there be a total of three caps connecting the positive rail to ground, of which two caps dztasheet 0.
The idea is to put another capacitor as close as possible datasheeh pins 4 and 6 to maximize the decoupling. There should be three caps connecting the positive rail to ground.
Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386
The uF and 0. This was my first ampmy first real circuit, and I did it with your video! I was wondering If could get a schematic of the 2nd circuit with the volume and the gain at my email hjay gmail. Sir, thank you for the great tutorial it really helps a lot can you give us an schematic diagram? A Good Job of explaining this. I started with the LM then the LM op amps so I am always pleased to see someone trying to make this simple for the new folks! Is is possible to use more than 9v for example 12v with the two latter circuits just as is or is there anything that needs to be changed?
Do you mean the pF capacitor?
You can use another value for all of the capacitors, but they should around the same value. You can connect two speakers in parallel. So the two negative wires would connect to the negative rail, and the two positive wires would connect to the negative side of the uF capacitor. This will still datasgeet a mono amp though.