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多路音乐报讯对讲机 本文介绍一种制作简便、性能稳定、成本低廉、体积小,巧的多路音乐报讯对讲机。它是有线对讲机,可广泛应用于家庭房室、机关内部、学校办公室与教室、旅馆服务台与客房、工矿企业科室与车间等相互间通信(话)。对许多初学爱好者来讲,该机最实际的用途之一就是作为多路分门(前、后门等)音乐报讯对讲机。 该机由主机和若干个分机组成,主机与各分机间均可相互呼叫和对讲。为了便于制作调试及降低制作费用,主机是利用几乎每个家庭及单位都有而现在又多半闲置的普通或老式收音机、收录机、扩音机等改装而成的。由于电路设计合理,故改装后的对讲机仍具有原来的收音等功能,不受新增功能的影响,而且使用起来也甚为灵活方便,得心应手。 1.电路基本原理 多路音乐报讯对讲机的电路如图1所示。图中虚线大框内所示为原收音机电路,本机仅利用了其音频放大部分,收录机和扩音机的低放(即音频放大)部分原理与收音机相同或相似,制作时同样可参考图1。虚线大框内电路和收/发话切换开关S1、音乐集成电路HYΚ5、发光二极管VD1～VD3、插
Multi-channel music newspaper walkie-talkie This article describes a production of simple, stable performance, low cost, small size, clever multi-channel music news intercom. It is a wired walkie-talkie, can be widely used in the family room, the internal organs, school offices and classrooms, hotel desks and rooms, industrial and mining enterprises departments and workshops such as mutual communication (words). For many beginners in terms of fans, one of the most practical uses of the aircraft is as a multi-channel (front, back door, etc.) music radio news walkie talkie. The aircraft by the host and a number of extensions, the host and the extensions can call each other and intercom. In order to facilitate commissioning and production costs, the mainframe is modified with ordinary or old radios, tape recorders, amplifiers and more, which are now almost unused in most homes and units. Due to the circuit design is reasonable, so the modified walkie-talkie still has the original radio and other functions, not affected by the new features, but also very flexible to use, handy. 1. The basic principle of the circuit Multi-channel music newspaper walkie-talkie circuit shown in Figure 1. The figure shows a large box in the dotted line for the original radio circuit, the machine only uses its audio amplifier part of the radio and amplifier amplifier (that is, audio amplification) part of the same principle or radio and the same principle, the same production can refer to Figure 1. Dotted line large-box circuit and the receiver / talk switch S1, music integrated circuit HYK5, light-emitting diode VD1 ~ VD3, plug