Single Phase to Single Phase Midpoint Cycloconverter Trainer - BRAND - VIJAYANTA, INDIA To Study of Single Phase to Single Phase Midpoint Cycloconverter Trainer, Model: SPCC â?? 100 The set â?? up Consists : Four SCRs, one transformer, one midpoint tapped inductor Logic controlled firing control circuit. A selector switch is provided to obtain �½, 1/3, �¼ of input frequency . Opto isolators are used for coupling of logic signals with the thyristors. Test points are given at different places for observations. A resistive load and an inductive load in form of small motor is provided.