Triac Schematics - aka "Triac" triac is a silicon single crystal for P1N1P2N2 four three-terminal device base material, is evolved on the basis of the ordinary SCR AC switch devices, namely, its English name TRIAC triac AC switch meaning, invented in 1957. Triac unidirectional conductivity switch can replace two parallel SCR reverse polarity, and only a trigger circuit. SCR has a turn-on and turn-off of two states, to distinguish from the appearance are: bolt-shaped, flat-shaped and flat-bottom shape categories. Because triac thyristor characteristics similar vacuum, so called silicon transistor gate through the international flow tube, called SCR T; and because thyristor controlled rectifier initially applied to aspects of SCR, it is also known silicon controlled rectifier elements, referred to as SCR SCR. Unidirectional SCR trigger characteristic test between A, K plus allowable forward voltage, two tubes are not turned on, this time between when the G, K will be formed with a positive voltage controlled current flowing V2 base, so the cycle until the two fully turned. When turned on, even if Ig = O SCR BTA412Y, V2 has the base current due to SCR BTA216, and far outweigh Ig SCR BTA212, and therefore the two tubes are still turned on. For conducting thyristor off, A, K forward voltage must be reduced to a certain value, or vice versa, or disconnected. The conductive properties of the SCR can be used to test multimeter resistance profile. For low-power thyristor can figure 3 (a) joins the circuit shown, SCR BTA312_ are fertile Electronics (certified) _ SCR Dongguan City is provided by Wal-Electronic Technology Co., Dongguan City is Wal-Electronic Technology Co., Ltd. (www.dgmydz.com) (www.dgmydz.com) is Dongguan, FET leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Wal-electronics leader in the positive with the staff warmly welcome all inquiries negotiations to create a positive future Wal-electron better.