Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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松川继电器JS20单结晶体管时间继电器电路设计

2016/8/12 10:43:18点击:

电路由延时环节、鉴幅器、输出电路、电源和指示灯五部分组成。电源的稳压部分由电阻R,和稳压管vs构成,为延时环节供电,输出电路中的晶闸管VTH和继电器。KA则由半波整流电路直接供电。

   电路原理:电路由延时环节、鉴幅器、输出电路、电源和指示灯五部分组成。电源的稳压部分由电阻R,和稳压管vs构成,为延时环节供电,输出电路中的晶闸管VTH和继电器。KA则由半波整流电路直接供电。当接通电源后,经二极管VD1整流、电容cl滤波、并经RJ和VS的稳压后,通过RP1、R4对电容G进行充电。电容G上电压按指数规律逐渐升高,当此电压大于单结晶体管VT的峰点电压时,单结晶体管导通,G经VT的eb1极和风放电,在风上输出脉冲电压,触发藩闸管VTH导通使继电器KA吸合,KA的触头同时将C3短路,使之迅速放电,单结晶体管的ebl之间电压迅速下降,当降到Vr.的谷点电压时,Vr关闭。同时LED指示灯点亮。当切断电源时,继电器KA释放,电路恢复原始状态,等待下次动作。通过调节RP.可以调整延时时间。

JS20单结晶体管时间继电器电路设计