Megaphones are commonly used and typical electronic products. It is composed of three parts of DC stabilized power supply, audio preamplifier and power amplifier (as shown in Figure 1). Loudspeakers basically cover the entire contents of the amplifier circuit and are very comprehensive. And each part is a separate unit circuit. In this production, the audio preamplifier and the power amplifier part are taken as two items, which are respectively elaborated on the design and production, and then some auxiliary circuits are added. They are connected together and through debugging, they constitute a practical amplifier. This production can help students build the concept of the system and the whole machine.
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