Audio amplifier using lm 386 stereo

Availability Availability 10 In stock. The gain of the circuit is about that means the output can be amplified times. The operating voltage of the module is from 5V to12V. It also has an on-board power indicator LED and a 10k potentiometer which can be used to adjust the volume gain of the output audio signal. It has an absolute maximum rating of 15 V.

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Content:

• Low Power Audio Amplifier Using IC LM 386
• LM386 Audio Amplifier Circuit
• Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386
• LM386 Audio Amplifier
• LM386 Audio Amplifier Module
• Stereo LM386 Audio Amplifier Kit (#2142)
• LM386 Audio Amplifier
• Technology Remaking the World
• IC – LM386 – Low Voltage Audio Power Amplifier
• Robot or human?

WATCH RELATED VIDEO: Make the PERFECT LM386 audio amplifier?

Low Power Audio Amplifier Using IC LM 386

I have seen a lot of LM amp designs that have all been "easy to make," "use few parts," or just "small," but most of these amps just don't sound that great.

I wanted to build an LM amp that actually sounds good, no matter how many parts it may take. So with a LOT of trial and error and research, i came up with this design which produces a very clean sound with no distortion, clipping, or other noises that typically give the LM amp a bad name!

Since i wanted a stereo amp and the LM is mono, i build two identical circuits on the same board, only sharing the first two decoupling capacitors C1 and 2.

For the ease of reading the provided schematic, only one of the two channels is shown. C1, 2, 4, and 6 provide decoupling. Anything i plan on plugging into this has its own volume control built in, so a potentiometer, for me, was not only redundant, but another cause of noise.

Also, if the input signal is amplified too much, the amp will be over driven and start to clip. This is also why i did not put a capacitor between pins 1 and 8, which provides more gain. The larger the capacitor, the more bass signal can pass. I only used a uf, but you can use up to a uf. A large part of the great sound is not only the elaborate circuit, but a sealed solid enclosure for the speakers; leaving the speakers in free air will diminish the sound quality. When I first started this project, I used some speakers that I salvaged from a dead flat screen TV that my neighbor gave me.

They came in their own enclosure and sounded great Ultimately, I wanted something that was a little more aesthetic so I found another pair of decent speakers that were 3" in diameter, had big magnets, and a flanges so i could bolt them in place.

I tested them by placing them in soup cans and sealing the edge with electrical tape. They work quite well. The top and back of the box are plexiglass, so the internal components can be viewed. I'm not the greatest carpenter, so I'm not going to go through all of the specifics, and you can use your imagination.

The most important things are to use solid material avoid thin plastic and metal and no holes in the enclosure for air to move through caulking if your friend! I did have problems working with the plexiglass. It took four tries to get the rear panel because of cracking. If you choose to work with plexiglass, don't rush or try to force something through a hole that is just too small!

Make the hole a little bit too big and seal it with caulk! After I built the enclosure, I test fit the electronics to determine wire length needed for the power supply, switch, and speakers. I soldered most of the power connections and added female spade connectors to the speaker wires for easy installation.

Then I disassembled it, and finished the box with stain and polyurethane for a nice look and some protection. For final assembly, I glued the power supply in place because there was no room on the board to drill for a mounting hole.

Then I put the power cord in a strain relief bushing and snapped it in place in a hole in the plexiglass. I made the final terminations from the power cord to the power supply with crimp connectors before mounting the plexiglass. Instead of caulking, I used some foam gasket to seal around the lip of the plexiglass, just in case if I ever have to open the box back up. I screwed the plexiglass panels down with 10 round head screws each, and alas the top plexiglass panel cracked on the last screw because i over torqued it!

The crack is small and mostly unnoticeable so i left it I plugged the power cord in to the wall and the audio cable to my cell phone, flicked the power switch on and it started playing right away and sounds great! Reply 1 year ago. Reply 3 years ago. Where should I connect my volume control pots? What is the maximum current I should use on the power supply? What is the output power of this amplifier? Reply 4 years ago. First, if you want to have volume control, remove r2 and r3 and replace with a pot on each channel.

The datasheet calls for a 10k pot, but since my schematic calls for 2 - 22k resistors, you can probably use something in the 40 to 50k range as well.

The second question isn't so cut and dry because it depends on the current draw of the amp at a given volume level. My ATX power supply that i used during design and testing provides up to 4. The power supply I used in the final assembly only puts out ma and it also works well. So to anyswer your question, anything above ma is overkill.

The third answer is about 1 watt per channel. Your not gonna blow your roof of with this amp, but it is ideal for a small to medium sized room, and it has a very clean, pleasant tone. By jp25 Follow. More by the author:. The parts required are: PC board i used strip board LM IC x2 dip-8 IC socket x2 optional but suggested speaker x2 4 to 8 ohms each, at least 1 watt female spade terminals to connect speaker wires to speaker optional but suggested stereo audio jack pf, 33pf x2 , 33nf x2 , 47nf x2 non-electrolytic uf,.

I hope this Instructable helps someone out with design ideas for a LM amp build! Did you make this project? Share it with us! I Made It! Retro Arduino Radio by exposedwire in Arduino.

SuranK 1 year ago. Reply Upvote. LaalandC 3 years ago. RajarshiB9 4 years ago. I have 3 questions. Good questions! So to anyswer your question, anything above ma is overkill The third answer is about 1 watt per channel.

LM386 Audio Amplifier Circuit

The LM Audio Ampifier is a general purpose single-channel audio amplifier that can handle up to mW and is easy to use. The LM are handy for providing basic audio amplification in a project such as if you want to drive a speaker off a PWM pin on a uC and want more oomph than the uC can provide directly. They are general purpose amplifiers, so they can also be used in other small power amplification applications such as for driving small servos or ultrasonic drivers. These parts are LMN-1 or equivalent parts.

Build a Great Sounding Audio Amplifier (with Bass Boost) from the LM386

The circuit is very simple and construction is easy on a breadboard. This configuration will give us a gain of By removing R2 and connecting C2 across pins 1 and 8, we can increase the gain to It is important to understand that increasing the gain does not increase the output power. The increased gain is only used when a very low input signal is to be amplified. In a previous article I discussed building audio amplifiers using discrete transistors. While it is possible to build good audio amplifiers from discrete transistors, they are no match for the many audio amp IC's available to us.

LM386 Audio Amplifier

I have seen a lot of LM amp designs that have all been "easy to make," "use few parts," or just "small," but most of these amps just don't sound that great. I wanted to build an LM amp that actually sounds good, no matter how many parts it may take. So with a LOT of trial and error and research, i came up with this design which produces a very clean sound with no distortion, clipping, or other noises that typically give the LM amp a bad name! Since i wanted a stereo amp and the LM is mono, i build two identical circuits on the same board, only sharing the first two decoupling capacitors C1 and 2. For the ease of reading the provided schematic, only one of the two channels is shown.

LM386 Audio Amplifier Module

The IC LM is a 8-pin tiny power amplifier chip, specially made for operating under relatively low voltage parameters, yet provide considerable amplification. IC LM amplifier circuit becomes suitable for applying in small low power audio gadgets like in FM radios, door bells, telephones etc. Let's begin the IC LM amplifier explanation by studying its absolute maximum ratings first, meaning the parameters which should not be exceeded while using this IC in any circuit:. In order to make the IC better with its response, its pin 1 and 8 have been attributed with a gain control facility which may be set externally. Gain simply means the capacity or the amplifying level of the device up to which it is able to amplify the applied input low signal audio input.

Stereo LM386 Audio Amplifier Kit (#2142)

This is an audio amplifier with 2 LM integrated circuits. Basically it deals with the use of 2 amplifiers as in another article posted at a time ago. But this time it includes printed circuit board for stereo version, in addition to power supply. The circuit operates with power supply or batteries of 6 to 12 volts. The best performance will be when using a 12V power supply and 8 Ohms speakers.

LM386 Audio Amplifier

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Technology Remaking the World

RELATED VIDEO: DIY AMPLIFIER USING LM386 IC

The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24mW when operating from a 6V supply, making the LM ideal for battery operation. The LM is a low power audio frequency amplifier which is very commonly used in small audio amplifiers. The IC consumes very less power and hence can be operated using a 9V battery easily.

IC – LM386 – Low Voltage Audio Power Amplifier

Due to its simplicity requires minimum external components and high availability, LM is very popular among hobbyists for use in low-voltage audio amplification applications. Most of the time a potentiometer is used at the input side of LM to provide a volume control in the output speaker. The potentiometer does not control the gain of the amplifier itself, but it creates a voltage divider network at the input, which in fact controls the fraction of the audio signal that is fed to the amplifier. This project is about a stereo audio amplifier using two LM ICs with digital volume control for both left and right speakers. So, how would you control the volume digitally? You are right, by replacing the traditional electro-mechanical form of potentiometers with digital potentiometer chips. Stereo audio amplifier with digital volume control.

Robot or human?

In this instructable I will show you how to make a 1 Watt stereo amplifier with LM single supply low voltage audio amplifier. C1 and C2 are required by the regulator to ensure stability. C3 is for low frequency filtering. LED1 signalizes power.