What is the role of the SCR? One role is controlled thyristor rectifier, which is the most basic and most important SCR role. We know it can be done only diode rectifier circuit rectifier function, and not controllable, but do change once the diode SCR, they constitute a controlled rectifier circuit. In a basic single-phase half-wave controlled rectifier circuit, when a sinusoidal AC voltage in the positive half cycle, the control electrode is applied only when the trigger pulse, SCR was only triggered thyristor conduction BTA140, the load will be Output voltage thyristor T405-600T, so you can control by changing the trigger pulse arrival time on pole, to further regulate the average of the output voltage to the load, to the role of controlled rectifier. Way thyristor SCR triggering characteristic test between A, G joins a touch switch (in order to operate) SCR C106D, with a multimeter R × 1Ω files, black pen then A pole, the red pen then K, this time to add a forward voltage of the SCR (multimeter enclosed by batteries), multimeter pointer does not move, the SCR is not conducting, when you press the switch, A, G turns, in G, between K plus trigger voltage thyristor conduction only, multimeter pointer deflection SCR, pointing to a smaller value; when G, after A disconnected, lost control voltage multimeter pointer if the same position, SCR is still in the conduction state, indicating that the characteristics of the SCR trigger good, if G, after A disconnected immediately multimeter pointer deflection point ∞. That SCR is not conducting, then the characteristics of the SCR trigger bad or corrupted. SCR T405-600T_ 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. You can also access (www.dgmydz.com/supply_details_38936285.html), for more information about the company.