关键字: 多谐振荡器,继电器,计数器,译码器,七段LED数码管,产品试验,
8421编码开关
Abstract: Digital type time relay is a kind of fair traditional relay with digital integrated circuit in a kind of new relay of one body. It is little that this kind of relay have volume normally the accurate etc. characteristic of delay time. Our this design use TTL mainly series chip is the main part of circuit, And the design that carries out product using Auto CAD and 99th class Protel computer supplementary software. After completing this design we can in digital electronic technology, relay knowledge and Protel 99, Auto CAD wait for aspect have very deep knowledge and understanding.
Key words: Much resonance dissolute ware,Relay,Conter,Decoder,7 LED numbers show,Product text experiment,Turn yard switch8421