Triac thyristor structure principle and application of ordinary (VS) essentially belongs to the DC control devices. To control the AC load thyristor BTA216, reverse polarity must be two parallel thyristors, let each SCR control a half-wave, for which required two separate trigger circuit, use is not convenient enough. Triac is evolved on the basis of ordinary thyristor, thyristor SCR not only can replace two parallel reverse polarity, but only a trigger circuit, is the ideal communication switching devices. Its English name that triac TRIAC AC switch means. Detection methods described below use a multimeter RXl profile determination Triac electrode method, and also the ability to check the trigger. (3) the red pen then T1 very, very black pen then T2, then T2 and G short for G-pole plus positive trigger SCR BTA140, the resistance value is still about ten in Europe, and very disengaged after G If the resistance is constant, then the tube after being triggered thyristor BTA412Y, on a T1 T2 direction can be maintained in the ON state, and therefore having a two-way trigger properties. Thus proving that these assumptions are correct. Otherwise it is assumed that inconsistent with the actual need and then make assumptions, repeat the above measurements. Obviously, the identification G, T1, in the process, it checks the ability to trigger the TRIAC. If it is assumed to measure according to which, do not make Triac trigger conduction, proved to Pat damaged pipe. For pipe lA, and can also be used to detect RXl0 file for more tube 3A and 3A, to be elected RXl file, otherwise it is difficult to maintain the conduction state. SCR BTA204, SCR, are fertile Electronics Dongguan City is provided by Wal-Electronic Technology Co., Ltd. Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) strong, credible, FET and other industries in Dongguan, Guangdong has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the electronics are fertile and you hand into the brilliant, for a better future!