This paper also design a speaker circuit to let more people can listen.

本文还设计了音箱电路，以便导游器可以群体收听。

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Abstract: This design is a kind of design which based on the additional speaker circuits of the original car speaker circuit.

摘要：本设计是在原车喇叭电路的附加喇叭电路的基础上的一种设计。

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The design of such a speaker circuit can solve the conflict between no-honking of citys in reality and the inherent speaker sound excessive or insufficient, and with good practical significance.

设计此种喇叭电路，能够很好的解决现实生活中城市禁鸣和固有喇叭音量过大和不足的矛盾，具有很好的实际意义。

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He wrote about 30 books and was in demand on the university circuit as a speaker.

ECONOMIST: Julian Simon

Now Buckley, America's most distinctive public speaker, is giving up the lecture circuit in which he has labored for half a century.

CNN: Lance Morrow: We lose a great speaker, we gain a great book