Simple and practical TDA2822M integrated power amplifier
Le Xingyu, a student at the University of Electronic Science and Technology of China
The students in our bedroom are accustomed to listening to some music while eating or reading extracurricular books in the dormitory. You can only enjoy it with the Walkman. How can you let the students in this room enjoy it together? Now I introduce a power amplifier made with TDA2822M. Its biggest feature is its high quality and low price. It only uses 3V power supply. When the dormitory is powered off, two batteries can be used to emit the sound that prevents the other students from falling asleep. This pair of students who like to do it by themselves and lack money on hand can't be more suitable. The first new member training in the electronic creation room of our school is to make this power amplifier. After the practice of more than 30 students, the effect is very good. The sound emitted by a small circuit board (4 × 5.5cm2) is comparable to that of a portable radio recorder.
TDA2822M audio power amplifier integrated circuit is a product of Italian SGS company. It adopts 8-pin dual in-line plastic packaging structure, and the pin arrangement is shown in Figure 1. The minimum operating voltage of the integrated circuit is 1.8V, the quiescent current and cross distortion are very small, the circuit can work in stereo dual channel, and can also be connected as a BTL circuit. The output power during stereo working is 1W × 2 (Vcc = 9V, RL = 8Ω, THD = 10%) or 110mW × 2 (Vcc = 3V, RL = 4Ω, THD = 10%). The typical application circuit of this integrated circuit is shown in Figure 2. The circuit board of this amplifier can be made by knife-cutting method; the components can also be installed on the cardboard and connected by the wire bonding method, which looks ugly, but there is also a natural beauty. |
The following describes the production of the speakers that are matched with the power amplifier board. I used two 4-inch speakers. The speaker is paper cone, foam edge, 4Ω, 5W. Then I bought a carton box for 5 cents in the school canteen, cut two holes slightly smaller than the caliber of the speaker, and installed the speaker. Finally, the box is sealed and pressed against heavy objects to avoid resonance. Finally, connect and adjust the audition. Taking Aihua 273 follow-up listening as the sound source, a song "Sad Pacific" by Ren Xianqi is played.
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