TDA7733V 12V 20W Stereo Amplifier High-Performance Circuit Diagram
Amplifiers that operate from 12V DC, as a rule not put out much power, and they are usually not as good, hi-fi system. But this little stereo amp tics of power and low distortion boxes. With a 14.4-V power supply, it will deliver 20 watts per channel into 4 ohms at clipping, while harmonic distortion at lower levels of power in general, less than 0.03%.
This is an ideal project for those who want a compact stereo amplifier that can be operated from a 12V battery. It could be just the thing for an entertainer, the one you want small but gutsy amplifier that runs from a SLA battery or it could be used anywhere a 12V DC is available – cars, motor homes, remote homes with 12V DC or anywhere .
Because it works in DC, it is ideal for beginners or to make a project of the school without 240VAC power supply worries. You can run from a 12V battery or a DC PlugPack. But while it is compact and easy to build, there is no need to apologize for “just average” performance. Listening tests of a series of CDs, we were very impressed with the sound quality.
Long-standing readers may recall that we have a similar design 12V power amplifier back May presented 2,001th It was a setup similar to this, but it is now completely overshadowed by the much lower distortion and significantly improved signal to noise of this new design. In fact, let’s face it: The current system is not a patch on this new design. He used two IC TDA1519A, which in numbers greater than 1% distortion practically across the board and an SNR of 69dB only performed unweighted.
But with the power amplifier IC TDA7377 and some other improvements, the THD (Total Harmonic Distortion) of the new design about 50 times better than the old device (see performance chart for more details). The key is that the THD under typical conditions, and only 0.03% or less. It is also able to offer better performance by improving the output transistors in the new power amplifier IC.
In addition, the low power consumption at idle – not much more than 1W. Therefore, if you do not push it too hard not hot and not drain the battery too quickly. And because the IC has a built-in self-protection, that’s pretty much indestructible. It is self-limiting or stopping in the event of overheating and the outputs are disabled when they are short circuited.
With a 12V supply, the biggest swing voltage power amplifier to generate conventional semiconductors, is ± 6V. The result is a lean RMS 4.5W and 2.25W at 4 ohm or 8 ohm RMS, without regard to losses in the output transistors. Even if the power is about 14.4 (the maximum that can reasonably from a 12V car battery can be expected), which provides only the power of 6.48W and 3.24W numbers up to 4ohm and 8ohm or fees – not really enough.
There are three common solutions to this problem. The first is to stimulate the supply voltage change with a DC. This increases the cost and complexity of the amplifier, but it’s a way to get a lot of power from a 12V supply. However, we wanted to keep this simple project, and the rules of this technique.
There are variations of the stimulant method, such as architecture used in the class H amplifier IC TDA1562Q featured in Portapal PA silicon-chip. It is able to achieve 40W/channel but> 0.1% THD. In this case, the output of the amplifier itself, switching from a charge pump. The second method is to reduce the impedance of the speaker. Some stakeholders cars have an impedance as low as 2 ohm, which can be two times for delivery to the same supply voltage. However, we do not restrict the amplifier to the speakers 2 ohm.
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