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40 watts audio amplifier circuit

This circuit consists of two separate 20W bridged power amplifiers one for each channel based on four TDA monolithic Integrated Circuits to deliver more than 40W of music power into a pair of 4 Ohm speakers. Running on 12V DC, this stereo amplifier is ideal for the car in order to boost the audio power or to add two more speakers. In addition, it can be connected to any stereo audio source such as a Walkman, Discman, or MP3 Player. This fully assembled circuit consists of two separate 20W bridged power amplifiers one for each channel based on four TDA monolithic Integrated Circuits to deliver more than 40W of music power into a pair of 4 Ohm speakers. Running on 12V DC, this stereo amplifier circuit is ideal for the car in order to boost the audio power or to add two more speakers.


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WATCH RELATED VIDEO: TDA7377 amplifier 40W+40W unboxing \u0026 sound test

40W audio amplifier


Power amplifier is the part of sound electronics. It is designed to maximize the magnitude of the power of given input signal.

In sound electronics, the operational amplifier increases the voltage of the signal, but unable to provide the current, which is required to drive a load. In an amplifier chain system , the power amplifier is used at the last or final stage before the load.

Generally, the Sound Amplifier system uses below topology shown in the block diagram. As you can see in the above block diagram, Power Amplifier is the last stage which is directly connected to the load. Generally, before Power Amplifier, the signal is corrected using Pre Amplifiers and Voltage controls amplifiers.

Also, in some cases, where tone control is needed, the tone control circuitry is added before Power Amplifier. In case of Audio Amplifier system , the load and the load driving capacity of the amplifier is an important aspect in construction. The major load for a power Amplifier is the Loud Speaker. Power amplifier output depends on the load impedance, so connecting an improper load could compromise the efficiency of the Power amplifier as well as the stability. Loud Speaker is a huge load which acts as an Inductive and Resistive load.

Power amplifier delivers AC output, due to this the impedance of the speaker is a critical factor for proper power transfer. Impedance is the effective resistance of an electronic circuit or component for alternating current, which arises from the combined effects related to ohmic resistance and reactance. In Audio electronics , different types of Loudspeakers are available in different wattage with different impedance. Speaker impedance can be best understood using the relation between water flow inside a Pipe.

Just think loudspeaker as a water pipe, the water flowing through the pipe is the alternating audio signal. Now, if the pipe became bigger in diameter, the water will easily flow through the pipe, the volume of water will be bigger, and if we decrease the diameter, the less water will flow through the pipe, so the volume of water will be lower. The diameter is the effect created by the ohmic resistance and reactance. If the pipe gets bigger in diameter, the impedance will be low, so the speaker can get more wattage and the amplifier provide more power transfer scenario and if the impedance gets high then the Amplifier will provide less power to the speaker.

There are different choices as well as different segment of speakers are available in the market, generally with 4 ohms, 8 ohms, 16 ohms, and 32 ohms, out of which 4 and 8 ohms speakers are widely available in cheap rates. Also, we need to understand that, a amplifier with 5 Watt, 6 Watt or 10 Watt or even more is the RMS Root Mean Square wattage, delivered by the amplifier to a specific load in continuous operation.

So, we need to be careful about the speaker rating, amplifier rating, speaker efficiency, and impedance. In our previous tutorials, we made 10Watt Amplifier using Op-amp and power transistors , also constructed a 25 Watt amplifier using TDA But for this tutorial, we will build a 40W power amplifier which will drive an 4 Ohms impedance speaker.

We will use the same TDA which used in 25 Watt power amplifier, but to get 40 Watt power output we will use additional power transistors.

In the above image, TDA is shown. It is available in most generic online shops as well as on eBay. The pinout diagram is pretty simple and available in the datasheet,.

The Tab is connected to pin 3 or the —Vs Negative supply source. Not to mention, the Heatsink connected with the tab also get the same connection. If we check the datasheet, we can also see the features of this power amplifier IC. The features of the IC are quite good. It provides short circuit protection to ground.

Also, thermal protection will deliver extra safety features due to an overload condition. Also, there is another graph in the datasheet which provides the relation between the Supply voltage and output wattage. If we see the graph, we can achieve more than 26Watt output power if we use a split power supply with more than 15V output.

So, as we have already seen that it is possible to achieve 25 Watt continuous output through TDA But we want to make 40 Watt power amplifier. So, this additional 15 watt, we need to add two power transistor NPN and PNP to provide additional amplification and output wattage across the 4 Ohms loudspeaker.

To, achieve this additional power amplification, we used matched pair transistor BD and BD power transistors. Both Transistors are available in TOC package. Although this circuit can be powered using 15V to 40VDC. Additional power amplification is done using BD and BD transistor pairs. One major thing is the Single supply voltage.

As the amplifier is powered using a single supply, the input signal need to be lifted above a few volts so that the amplifier can amplify the signal in both a positive and negative peak. Resistors R6, R9 and R7, R8 are providing a bias voltage to the power transistors and power amplifiers.

The R10 and C5 is the snubber or RC clamp circuit to protect the amplifier from a huge inductive load of the Loudspeaker. We used proteus simulation tools to check the output of the circuit; we measured the output in the virtual oscilloscope. You can check the complete demonstration Video given below.

We are powering the circuit using 36VDC and the input sinusoidal signal is provided. The oscilloscope is connected across the output against 4 ohms load on channel A Yellow and the input signal connected across channel B Blue. We can see the output difference between the input signal and the amplified output in the video Also, we checked the output wattage, Amplifier wattage is highly dependent on multiple things, as discussed before.

It is highly dependent on the speaker impedance, speaker efficiency, Amplifier efficiency, construction topologies, total harmonic distortions etc. We could not consider or calculate all the possible factors which are created dependencies in amplifier wattage.

Real life circuit is different than the simulation because many factors are needed to be considered while checking or testing the output. We connected an AC multi-meter across the output. AC voltage shown in the multi-meter is peak to peak AC voltage. We provided very Low-frequency sinusoidal signal Hz. As in low frequency, the amplifier will deliver more current to the load and the multimeter will be able to detect the AC voltage properly.

So, as per the formula, the output of the power amplifier at 4 Ohms load is. When constructing the circuit, The Power amplifier TDA need to be connected with the heatsink properly. Larger heatsink provides a better result. Also, it is good to use audio grade rated box type capacitors for a better result. It is always a good choice to use PCB for Audio related application.

Construction Topology for Amplifiers In an amplifier chain system , the power amplifier is used at the last or final stage before the load. Get Our Weekly Newsletter! Helena St. Related Content. Understanding the Fundamentals of Digital Audio. Comments Log in or register to post Comment.


LM4766 Stereo 40w Amplifier Circuit

The 40 watt Stereo Power Amplifier is a solid state short circuit protected high quality stereo power amplifier specifically designed for Broadcast Studio Applications. Because of its low noise characteristics, it is suitable for a wide range of applications where a high quality, high gain amplifier is required. It is a self contained unit having a built in power supply for direct volt mains operation. This stereo power amplifier is perfectly suitable for continuous operation even under extreme loading condition. It also provides fail self protection against short circuit at output terminal, overheating of heat sinks and sudden current surge in the output. Have a requirement? Get Best Price.

Amplifier LM integrated circuit made ​​with two channels can give you 40 watts per channel output has supply voltage of 28 volts DC Output section 2.

40W transistor audio amplifier circuit with PCB


If you are looking for a first-class watt music stereo amplifier, then look no further. High output efficiency, negligible hum, low harmonic distortion, clarity of the output sound, compact modular size, and low cost are some of the key features of this fully solid-state integrated Hi-Fi stereo amplifier which is capable of delivering an output of over twenty watts into each channel. The circuit uses a minimum of components and is built around just two power ICs. Upon adding just a simple preamplifier, the circuit can be converted into a watt stereo cassette player. The circuit is based on an LM monolithic amplifier chip from National Semiconductors. The amplifier works in a way more or less similar to an op-amp. The 1 uF non-polar capacitors provide input coupling and the uF capacitors provide output coupling. The potentiometers RV1 and RV2 provide volume control.

Stereo Amplifier Circuit 20W + 20W

40 watts audio amplifier circuit

A stereo audio amplifier is a simple electronic circuit that can work as a sound amplifier. It consists of the core element TDAQ IC, which has a large number of built-in features that allow the circuit to be efficient and minimized. Therefore, with fewer components, you can create an effective electronic circuit which is simple and portable. You can use this circuit to boost the output to greater values. However, in this circuit TDAQ works like a stereo audio amplifier.

The circuit employs only few components and does not require a dual power supply.

Sixties-style 40 W Audio Amplifier Schematic Circuit Diagram


An amplifier , electronic amplifier or informally amp is an electronic device that can increase the power of a signal a time-varying voltage or current. It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain : the ratio of output voltage, current, or power to input. An amplifier is a circuit that has a power gain greater than one. An amplifier can either be a separate piece of equipment or an electrical circuit contained within another device.

Stereo Audio Amplifier (40 Watt) Circuit using TDA8560Q

This work is titled the design and construction of a 40 Watt Hi-Fi Amplifier. A 40 Watt Hi-Fi Amplifier is a device for increasing the audio power of a signal by use of an external energy source. It is design to meet up with the amplification demand in homes, offices, industries and especially in music industries. A 40 Watt Hi-Fi Amplifier low-power audio signals signals composed primarily of frequencies between 20 - 20 Hz, the human range of hearing to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain, While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. This device is designed to deliver appreciable 40w power to the load. Audio Power amplifiers may be called upon to supply power ranging from a few watts in an audio amplifier to many hundreds or thousands of watts to a load speaker. In audio amplifiers the load is usually the dynamic impedance presented to the amplifier by a loudspeaker, and the function is to maximize the power delivered to the load over a wide range of frequencies.

LA Audio Amplifier Boards 40 W DIY Kit all-audio.pro Size, Powerful and Quality Clear all-audio.pro by all-audio.pro

Online solutios

Power amplifier is the part of sound electronics. It is designed to maximize the magnitude of the power of given input signal. In sound electronics, the operational amplifier increases the voltage of the signal, but unable to provide the current, which is required to drive a load. In an amplifier chain system , the power amplifier is used at the last or final stage before the load.

40 Watt 4 Ohm Audio Amplifier Board Bangladeshi

RELATED VIDEO: Audio amplifier 40watt under 1$ - very easy - using IC 6283

Class D amplifiers, first proposed in , have become increasingly popular in recent years. What are Class D amplifiers? How do they compare with other kinds of amplifiers? Why is Class D of interest for audio? Find the answers to all these questions in the following pages. The goal of audio amplifiers is to reproduce input audio signals at sound-producing output elements, with desired volume and power levels—faithfully, efficiently, and at low distortion.

Main part of this circuit is IC TDA, it has wide range of input power supply voltage upto 40V, It can operate in both single and split power supply.

5 Best 40 Watt Amplifier Circuits Explored

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  1. Radeliffe

    hmm