Triac - construction principles triac thyristor devices belong NPNPN five T435-600T, three electrodes are T1, T2, G. Because the device can double conducting thyristor BT137S-600E, so in addition to the two gate electrodes G collectively outside the main terminal, with T1, T2. Said the SCR T435-800T, no longer divided into the anode or cathode. Triac - the two-way thyristor trigger circuit SCRl, SCR2 antiparallel. Then the control panel connected to this trigger circuit, it formed a simple and practical high-power variable speed circuits. Unique in this circuit is that the thyristor control pole without external power, just after this circuit in series with the load power thyristor BT134W-600E, SCR, are fertile electrons from Dongguan City is fertile Electronic Technology Co., The company offers. 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!