Way thyristor detection resistor R * 1Ω multimeter selected block, with red, black and two pen were measured between any two pins to identify positive and negative resistance until a reading of tens of ohms pin, then black pen The pin is a control electrode G, red pen pin cathode K, another empty pin anode A. The black pen then have to determine the anode A, the red pen is still attached to a cathode K. Multimeter pointer should not move at this time. By shorting the anode A short moment and the gate G SCR BTA216, multimeter power block pointer should point to the right deflection SCR, the resistance reading of about 10 ohms. A black pen pick anode, cathode K, take the red pen, multimeter pointer deflection, indicating that the way thyristor has breakdown. How to use single-junction transistor SCR trigger circuit it? RB1 base resistance decreases sharply SCR BTA412Y, capacitor C discharges rapidly through the PN junction to the resistance R1, so that the voltage across R1 Ug a positive transition occurs, forming steep pulse leading edge [Figure 8 (b)]. With the discharge of the capacitor C SCR BTA212, UE decline exponentially until below the valley voltage UV single-junction transistor is turned off. Thus, across R1 trigger pulse output is a spire. In this case, the power UBB began to charge the capacitor C, into the second charge-discharge process. This cycle, the circuit engaged in periodic oscillations. RP can change the oscillation cycle regulator SCR BTA312_ 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.