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第五讲警笛声电路警笛声电路是一个模仿救护车、救火车和警车发出声音的电路。一、预备知识 1.在警笛声电路里我们将用到晶体三极管,在电子电路中三极管的作用主要作放大信号和电子开关使用。三极管在电路中E、B和C应接有不同的电压,三极管才能工作。我们把E、B和C接上不同电压叫做给三极管设置静态工作点。不给三极管设置正确的静态工作点,三极管不会正常工作。在组装警笛声电路时,将使用一只塑料封装的PNP型三极管,型号为9012。
Chapter 5 Siren Sound Circuit The siren sound circuit is a circuit that simulates an ambulance, fire truck and police car. First, the preparatory knowledge 1. In the siren circuit we will use the transistor, the role of the transistor in the electronic circuit mainly for amplification signals and electronic switches. Transistor in the circuit E, B and C should be connected to a different voltage, the transistor can work. We put E, B and C connected to different voltages called the transistor to set the static operating point. Do not set the transistor to the correct static operating point, the transistor will not work properly. When assembling the siren circuit, a plastic encapsulated PNP transistor will be used, type 9012.