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利用DJ-702型电子继电器及其他少量元器件,可自行制作防盗报警器。 DJ-702型电子继电器是一种广泛应用于科学实验及工矿企业生产控制过程中的基本自动化部件,它具有结构合理,灵敏度高,稳定性好,重量轻,体积小,动作可靠,寿命长等特点。其工作原理如图1所示。由PNP型三极管V1和NPN型三极管V2分别组成两级开关电路,当输入控制端短路时,V1的基极和发射极及V2的基极和发射极,均处于零偏置状态,V1刊
Using DJ-702-type electronic relays and other small components, can make their own anti-theft alarm. DJ-702 type electronic relay is a kind of basic automation component which is widely used in the scientific experiment and industrial and mining production control. It has the advantages of reasonable structure, high sensitivity, good stability, light weight, small volume, reliable operation and long service life Features. The working principle shown in Figure 1. The PNP-type transistor V1 and the NPN-type transistor V2 form a two-stage switch circuit respectively. When the input terminal is short-circuited, the base and emitter of V1 and the base and emitter of V2 are both in a zero-bias state.