Homemade small power amplifier and speaker (TDA1521) 1. The power amplifier part adopts high-fidelity integrated block TDA1521. The peripheral circuit of the integrated circuit is extremely simple, and there are protection circuits such as overheating, noise suppression, and short circuit, which are suitable for beginners to make. The front stage adopts NE5532 for 10 times line amplification. Coupling capacitors can use domestic CBB capacitors or tantalum capacitors. The pre-stage power supply is obtained by voltage stabilization of 7815 and 7915, and the power transformer should be selected above 30W. Rectifier can use 3A full bridge. The circuit of the power amplifier is shown in Figure 1, and the circuit of the power supply is shown in Figure 2. The circuit board can be carved with a utility knife, and the power amplifier block should be added with a large enough radiator. |
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