TDA2030 datasheet can give you the power circuit according to the information 18w mono 30w 2 is called the total power used in the audio input you can control the volume potentiometer meters.
12 volt 4 amp transformer to supply power, but suggested that I use a straightening method previously applied. I do not know what is the quality in sound quality a different method.
TDA2030 Amplifier Circuit
This stereo amplifier is ideal for beginners, for its simplicity and low cost. Use a pair of TDA2030 integrated. This monolithic integrated circuit is a class AB, which comes to providing up to 15W of output power with an 8 Ohm load. The TDA2030 provides high output current and low harmonic distortion. Also incorporates a short circuit protection, which automatically limits the power dissipated to keep the working point of the output transistors, ensuring power operation. System also includes a conventional thermal shutdown.
TDA2030 circuit schematic pcb files alternative link:
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Published: 2010/01/22 Tags: audio amplifier circuits, ic amplifier
TDA7294 Bridge 300W Amplifier Circuit
TDA7294 amp integrated circuit is made with a lot, but I did share a few of them have been very good this circuit layout design can be said as in the original sound system.
1 x 100w power can be obtained with two TDA7294 TDA7294 with bridge connection can be taken 200w power supply voltage is kept low in this application gives you the power 150w per channel.
Symmetrical circuit supply voltage + – 25 volts DC suggested 2 × 18-volt AC 12 amp transformer used for the filter capacitor 4700uF instead of 6800uF good to use