Scr and Zener regulating circuit

Discussion in 'The Projects Forum' started by gman4dx266, Aug 31, 2015.

  1. gman4dx266

    Thread Starter New Member

    Aug 8, 2013
    Hey guys hoping you can help me..I.built this circuit for rectifying 3 phase AC into regulated 13/14 volt DC. The issue I have is the SCRs are triggering after the AC rises past a certain point and are dumping off voltage instead of maintaining a constant DC voltage. Is the Zener possibly undersized, I'm in need of a gate cathode resistor, or the gate trigger resistors are wrongly sized to begin with? Thanks in advance!