How to determine the three poles of SCR? How to determine whether the damage to the SCR? Identification of three poles SCR SCR method is very simple, according to the principle of the PN junction, just use a multimeter to measure the resistance value between three poles can be. Forward and reverse resistance between the anode and the cathode in the hundreds of thousands over Europe SCR BTA208, forward and reverse resistance between the anode and the control electrode of the hundreds of thousands over Europe (among them two PN knot, but in the opposite direction, so the anode electrode and the positive and negative controls do not pass). Triac structure principle and application of typical applications Triac can be widely used in industry, transportation, household appliances and other fields, to achieve AC voltage regulator, motor speed, AC switch, automatically turn on and off street lights, temperature control, lamp dimmer, stage dimming functions, it is used for solid state relays (SSR) and solid-state contactor circuit. Figure 5 is a proximity switch circuit constituted by Triac. R is the gate current limiting resistor thyristor BTA216, JAG dry reed pipe. JAG usually off thyristor BTA316, Triac TRIAC is also turned off. Only when a small magnet when JAG pull closer, so that two-way thyristor, the load power is turned on. Due to the current through the reed is very small, only a few microseconds of time, so life is very long thyristor switch BTA216 | are fertile Electronics (certified) | SCR Dongguan City is provided by Wal-Electronic Technology Co., Ltd. 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.