Simple and easy TDA2822M amplifier, TDA2822 AMPLIFIER
Keywords: TDA2822M, amplifier circuit
The general integrated power discharge circuit is more peripheral components and requires a larger heat sink. The power amplifier circuit introduced in this article is simple and self-made. The circuit is shown in Figure 5-107. With a TDA2822M amplifier integrated circuit to be used as a BTL mode, only one resistance and two capacitors, no heat sink, and the playback effect is also satisfactory. The integrated circuit TDA2822M is 8 foot dual-column-in-line packages, and if you do not buy TDA2822 instead, the TDA2822 package is the same as TDA2822M, which distins: TDA2822 can work from 3V to 15V, while TDA2822's highest operating voltage is only 8V. The voltage must be lowered below 8V using TDA2822. The numerical requirements of R1 are not unstressed, and 10K carbon film resistors are generally selected. C1 optionally uses 0.1uf polyester capacitance, C2 is 100uf / 160V electrolytic capacitance. Figure 5-108 is a printed circuit board diagram. Due to the simple circuit, the printed plate can be used to rub the sandpaper or a small amount of milk on a small amount of water. Wipe it with water, apply a layer of rosin alcohol solution, dry the element directly to the copper foil. After welding, check correctly, then you will not pick up the speaker, connect the power supply, and the voltage between the positive and negative outputs should be less than 0.1V. Connect the speaker, touch the input with your hand, the speaker should make a large "" sound. At this time, you can enter the signal audition. The circuit board does not have to drill,
Be careful when using: Since the actual is in direct coupling, the input signal cannot with the DC component. If the input signal has a DC component, it must be separated by a capacitance of about 10UF on the input end, otherwise there is a large DC current flowing through the speaker, making it heat fever. In practice, the effect is more desirable if appropriate reforms of Figure 5-107 are more ideal. The improved circuit is shown in Figure 5-109. It was found in the use, and the volume of TDA2822M was hot, so that the radiator was produced to TDA2822M, as shown in Figure 5-110. The heat sink is made of aluminum sheet having a thick LMM, a length of 38 mm, a width of 25 mm. And on the heat sink, 5 ~ 6 troughs with a groove of 10 mm, wide LMM, and then fold the heat sheet into a "mouth" shape. When the heat is loaded, the silicone fat is placed on TDA2822M (silicone fat can be taken away from the 3ax31 or 3ax81 housing). Troubled with thin lines as shown in Figure 5-111 (a). It should be noted that the number of pins of the TDA2822M is written on the side of the heat sink to avoid errors when welding. After the heat radiator is added, the volume is opened to the maximum heat sink, and the heat dissipation is good. This method can also be used for heat dissipation of other small integrated circuits. We use two amplifier circuits to listen to the stereo power renewal, to promote two small speakers, the effect is very good. In fact, where you are complicated, I directly connect the angle, connect the speaker, source, plus 6 ~ 12V DC, all OK. However, replacing different sources and speakers, I found 2822. It is simple to do, the cost is also low, which is much better than the cheap active speaker bought.
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