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Lm3876 amplifier circuit

This is my second encounter with LM I was pleased with the sound this chip produced the first time, so I decided to make another amplifier with it. The schematic is based on the schematic in the datasheet of the chip with minor changes. I made the output inductance L1 by winding 15 turns of enameled wire around the resistor R7.


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WATCH RELATED VIDEO: LM386 Audio Amplifier Circuit With Bass Boost and Volume Control

High-Performance 56W Audio Power Amplifier With Mute


A simple 50 watt amplifier circuit is explained below, let's learn how to build it at home using this versatile single amplifier chip LMT.

A good power amplifier is a necessity, especially when it comes to listening music. An amplifier added to a sound system will definitely enrich the quality of music. This project therefore will attempt to give you a detailed insight of making a simple 50 watt power amplifier. The system that we are going to deal with is primarily based upon the technical specification laid out by National Semiconductors , and following this the result came out well.

Easy to build and good output in terms of distortion and noise, the following section will detail the way it is built. Before we kick-start this development, we have tested the PCB and result came out positive. We have received very good sound quality provided the protection circuitry is not in operational mode.

As per the diagram, there is an addition of polyester bypass capacitors and the mute circuit is left disabled, since it is mainly useful when developing a preamp. However, we made some adjustment into the board to provide space for power and input connectors.

As per the above figure, the voltage gain is set to 27dB, and it can be changed by adding resistors of different value for the path of the feedback. The inductor has 10 turns of enameled copper wire of 0. The soldered wire lies at the end of the resistor and the insulation should be brushed off on each end.

Our recommendation would be to use 1watt type 10ohm and 2. It is also ideal to keep the electrolytic capacitors 50V. For supply, nF 0. Also to achieve lowest case to the heatsink thermal resistance it is vital to engage max power. This can be done by mounting mica washer with no insulation. However, do keep in mind the heatsink need insulation from the chassis since the heatsink maintain supply voltage of —ve.

Referring to Figure above, the revised board is very much similar to that of the original one, except some changes by removing some components along with the SIM. The present on-board decoupling gives great performance. It uses electrolytic of nF Polyester and uF electrolytic. Alternatively, you can also use monolithic ceramic capacitor on every rail. While C1 and C2 is referred as polarized electrolytic types, you may use non-polarized electros.

Another option would be to apply on C1 a 1uF polyester cap. If C1 is intended to be used as tweeters you can use small values of nF which is good to go ahead. Also you can use 1uF polyester at the rate of -3dB 7. However, this adjustment would increase the performance of the bass and you can also apply any value till 10uF approx.

The new design of the PCB facilitates using the amp as dual-mono. You can split the PCB track while each individual has its own power supply. It is very much identical and moreover the specification is higher. The PCB also have the provision to connect pin number 1 and 5. Furthermore, you can also use the board as a bridge in case of LM to achieve W into 8ohms.

To run an amp as inverting is a common occurrence, but doing that ends up with low impedance to the preamp, which may give trouble as you may find distortion or problem in loading. Therefore, it is always safe to drive the amplifiers, since the P87B can drive each amp individually. Whereas parallel operation is often a common suggestion when building this system, our experience in this domain does not recommend the same. The requirements for gain tolerance during parallel operation is very strict as you need to ensure the amplifier matches 0.

The LM on the other hand is very much identical to the former, and it can be used by adding little more power, if needed. The PCB used for this amp is mainly meant for stereo amplifier. It is single-sided with the location of supply fuse in the PCB. The stereo board contain small four fuses mm x 40 mm. Overall the revised board as in Figure 1. However, as a caution do keep in mind to use heat-sink for this project as the system gets really hot within a short time, which may end up destroying the things from overheating.

Datasheet TDA The following image shows how a simple 50 watt hi-fi amplifier circuit could be constructed quickly using ordinary transistors, and resistors.

If you have any circuit related query, you may interact through comments, I'll be most happy to help! Your email:. Daniel, LM is very common IC, if that is not available then other variants may also be impossible to get. Your email address will not be published. Notify me via e-mail if anyone answers my comment. You'll also like: 1. Good day sir, this ic LM is not found in my which of the ic will I use to replace it.

Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic! Cancel reply Your email address will not be published.


lm3876 audio amplifier

Welcome to www. My account of architecture of this activity was to advance a bunched architecture for a stereo amplifier can be chip by a amiss but the complete affection conscious! Living apprentice at a university or a academy dormitory. The amplifier feeds a brace of speakers with two LM amplifier chip circuits 50 watts per channel , or a brace of headphones Meier Crossfeed through a clarify and a bifold OPA Opamp. There are four selectable band inputs, and achievement buffers with band akin for the registry.

Typical Audio Amplifier Application Circuit. Connection Diagram. Top View LM is directly mounted to the heat sink using only thermal compound.

LM3876 56W Amplifier Linear IC


I used a cut-down P88 preamp PCB because I only wanted one preamplifier stage, but the entire board can also be used. Alternatively, the P19 amp can be run at higher gain than normal, alleviating the need for a preamp at all. All Rights Reserved. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings. The output waveforms can be both amplitude and frequency modulated. LM Gainclone Amplifier. The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.

LM3876 Gainclone Amplifier

lm3876 amplifier circuit

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The LM can deliver 50watts of output power into an 8 ohm loudspeaker. LM has excellent signal to noise ratio and has wide supply voltage range.

Simple 50 Watt Power Amplifier Circuit


The device also contains thermal shut-down protection which comes into operation if the chip temperature exceeds its safe operating range, and under-voltage shut-down in the event it to operate properly. The LM is internally compensated and stable fro. Leave Comment characters left:. Tube amplifiers designed for headphones have the principal property that they can be used as This circuit detects the Hz approximately Vrms ring signal on telephone lines and This audio amplifier showed in this circuit diagram, is a very simple and efficiency audio

56W LM3886 / LM3876 Gainclone

Which is easy to build , sound quality, and cheap because the LM works perfectly. IC amplifier is very popular. And often are used in Mini component and easy to build, saving, fast. Due to the complicated circuitry is contained within the IC is complete. Therefore does not require customization. Just a small number of external components, can use it. Which is a size is great for listening in the room.

all-audio.pro:ZL Type Pins DescriptionLM 11 56 watt audio amplifier TO Add to wishlist.

A Complete Guide to Design and Build a Hi-Fi LM3886 Amplifier

Note: Editable PCB files are available for this project here. The reason for its popularity is due to its very low distortion, minimal external components, and low cost. With the right layout and component selection, you can build an excellent sounding Hi-Fi audio amplifier that will rival high-end amps retailing for several thousand dollars or more. My amplifier is based off of the same circuit provided in the datasheet, with all of the optional stability components included.

Post a Comment. The LM can deliver 50watts of output power into an 8 ohm loudspeaker. LM has excellent signal to noise ratio and has wide supply voltage range. Other features of LM are output to ground short circuit protection, input mute function, and output over voltage protection, etc. Applications of LM are component stereo, compact stereo, surround systems, self powered speakers, etc.

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It is a 2x56W power amp based on National Semiconductor's LMT chip they come in 2 versions T and TF the latter having an insulated case , this type of amp is also known as a gainclone because it is an improved copy of Gaincard amplifier. All Rights Reserved. If you are powering more than 2 channels a VA or VA transformer is recommended. The capacitors used after ufuf 50V will bump this up to around 30V. NOTE: the two grounds shown are to be joined together to form the 0V line which is also connected to mains earth. You will require one of these circuits for each speaker.

LM powered by Li Ion. But with batterie soundstage is so impressive, and finaly it's not a problem to use high gain.. I don't see an output inductor on these boards, so things might simply be unstable at lower gain.




Comments: 3
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  1. Nadiv

    Exactly! Good idea, I maintain.

  2. Maugrel

    the phrase Remarkable and is timely

  3. Bassam

    excuse me, i deleted this question