Triac - trigger two control circuit between the respective cathode electrode and there 5V ~ 8V pulsating DC voltage generation, adjust potentiometer R2 can change the two SCR conduction angle, increasing the value of R2 to a certain extent, you can block the placement of the two main thyristor SCR, so R2 can also play a role in the switch. Triac - trigger circuit SCR3 with the surrounding elements constituting ordinary phase-shift trigger circuit SCR BT136S-600E, the principle is omitted here. SCR1, SCR2 selection of packaged SCR module (110A / 1000V), SCR3 selection BTl36, namely 600V triac. This circuit is used as an inductive load, should increase the R4, C3 RC snubber circuit and varistor RV for overvoltage protection, preventing the load off and on instantly generate high voltage damage induction thyristor SCR BT134W- 600E | 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!