Triac - thyristor connected differential voltage characteristic way junction J3 also breakdown, the current rapid increase in SCR BT134W-600E, characteristics began to bend SCR, as shown in patches segment characteristic OR SCR, voltage bends URO called "reverse breakover voltage." At this point, the SCR will be a permanent reverse. Triac - trigger two control circuits between the respective cathode electrode and there 5V ~ 8V DC voltage pulse generation SCR BT137S-600E, adjust the potentiometer R2 you can change the two SCR conduction angle, increasing the resistance R2 to a certain extent, you can make two main thyristor blocked so the R2 also functions as a switch. Patch SCR, it is fertile Electronics (certified), SCR provided by the Dongguan City, is Wo Electronic Technology Co., Ltd. Dongguan City is Wo Electronic Technology Co., Ltd (www.dgmydz.com) (www.dgmydz.com) Dongguan, Guangdong, FET leaders, 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-e-leadership in the positive with the staff warmly welcome all inquiries negotiations to create a positive fertile electronic better future.