[attachmentid=745]I have been trying to understand this circuit, but i do not know how rectification occurs at the output or R1. C1 is capable of voltages up to 63V and C2 is capable of voltages up tp 50V. I used Circuit Maker and actual sine wave to look at signals at different nodes. Somewhere in the circuit AC is switched to DC. I just do not know where. I know C2 performs the full wave rectifcation, but where is the half wave rectification. Also, I think D1 is to prevent signal loss, but I am not sure. Please help me understand why R3, R2 and C1 is needed at the gate of the SCR. Once the gate is triggered the SCR will conduct, correct. Please help