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第四讲声响器电路声响器是只发出一种单音的装置。可以用作门铃或报警器。一、预备知识 1.在声响器电路里我们将用到喇叭。喇叭是一个能够把电流信号变成声音的元件,在电子学里,我们用BL表示喇叭。喇叭根据用途不同而种类繁多,我们在声响器电路中使用的是晶体管收音机里常用的小型恒磁喇叭,在喇叭磁钢上标有8Ω、0.25W的字样,8Ω是指喇叭的阻抗,0.25W是指喇叭的额定功率。 2.声响器电路是一个能够发出1kHz单一频率的电路,所以在学习声响器电路时我们还应该知道频率的概念。在物理学和电学里,我们把每秒钟内声波和电波形完整变化的次数叫做
Lecture 4 Sounder Circuit Sounder is a device that emits only one tone. Can be used as a doorbell or alarm. First, the preparatory knowledge 1. In the sounder circuit we will use the speaker. A speaker is a component that turns a current signal into a sound. In electronics, we use the BL speaker. Speaker according to the use of a wide range of different, we use in the sonar circuit is commonly used in transistor radios small constant magnetic horn, marked on the speaker magnet 8Ω, 0.25W words, 8Ω is the speaker impedance, 0.25W Refers to the speaker’s rated power. 2. The sounder circuit is a circuit that emits a single frequency of 1kHz, so we should also be aware of the concept of frequency when learning the sounder circuit. In physics and electricity, we call the number of complete changes in sound waves and waveforms per second