Circuit of quadruple amplifier for systems surround using the ci tda, for potency of 7 watts for channel in the version amplifying quad or 15 watts in the dual version stereo. TDA is a circuit integrated amplifier quadruple audio amplifier class AB capable to work in double bridge or simple quadruple amplifiers, circuit integrated with protection system of short, it requests the minimum of external components , available in multiwat 15H TDAH and multiwat 15V TDAV. That integrated circuit is ideal in the situation in that is wanted a reasonable potency and with a Power tension relatively low for your operation. That circuit drawn below it uses the basic configuration of quadruple amplifier, but using a configuration in bridge, it can be obtained about 4 times the maximum potency. In that configuration of quadruple amplifier it can be used as amplifier end of systems surround, when 7 watts for channel are already a good potency, using the minimum of components.

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Amplifier 2. It has 4 outputs that can Electronics Projects, Amplifier 2. It has 4 outputs that can deliver a power of 15W each.

On the other hand there is another mono amplifier, which is formed by the other 2 outputs in bridge mode, and delivers a power of 30W. Another additional circuit is a low pass filter that is connected to the input of the 30W mono amplifier.

So this one only delivers low frequencies. While the stereo outputs, have a frequency response approximately, from Hz, to 20, Htz. Another interesting feature of our design is that it is fed with a simple font. In addition, the preamplifier, the low pass filter, the rectifier source and the amplifiers are all on the same card. What speakers should we use? It is advisable to use full range speakers.

Another option is to be speakers with good average and high response, since the bass goes separately. The size is to taste. I used 2. For the bass you should use a subwoofer of 30W RMS on, of soft suspension. So we must deliver a continuous voltage to the amplifier. Thinking of being able to use transformers with our project, we include in the card a diode bridge and a capacitor. In the PDF file we deliver two versions of the amplifier 2.

However, I prefer the version with a source, even though at any given time, I use a battery or DC switched source. It turns out that the diode bridge, when used with DC current, allows to connect in any polarity. So if someone accidentally connects the inverted voltage, the bridge always redirects to the correct polarity.

This works as a way of protection for our amplifier. Preamp and tone control There are plenty of integrated circuits operational amplifiers like the TL Everyone works in a similar way and many are compatible.

The TL contains two amplifiers. Each one has its characteristic sound, without demeriting one from the other. The function that it does in our amplifier, is to amplify the signal a bit, since the TDA comes with the fixed gain and is somewhat low. If for example we amplify a cell phone, directly with the TDA, its volume is somewhat low. However, when you first pass through the preamplifier with TL, the sound is stronger. Not to mention that we can modify the gain just by changing a pair of resistances.

The gain is left in This is determined by the division of 56K in 5. If for example we want to increase the gain, we can raise the resistance of 56K. And if the idea is to lower the gain, this in case the player has a very strong output and there is distortion, it is enough to lower the value of those same resistances.

As we mentioned at the beginning, our amplifier has a low pass filter. It receives the signal from the already amplified TL, to be processed. The low pass filter is responsible for restricting the passage of high and medium frequencies, and only allows the passage of low frequencies.

The TL is a chip that only contains one amplifier inside. Take into account that our amplifier is called 2. The cut of frequencies is done mainly by the two capacitors of 0. If you require more frequency cutting, just raise the value of these two capacitors. The low response of TL is better than that of TL, for this reason we chose this one.


TDA7378 STMicroelectronics



Amplifier 2.1 with TDA7377


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