SCR FORCED COMMUTATION CIRCUITS This trainer is designed to study the working principle of SCR Based DC-DC Chopper circuits (Class A to Class E Circuit ). This trainer consists ofTwo number of TYN612 SCR with heat-sink is provided for Power circuitOne number of Power diode & Inductor is provided for Power circuitOne number of TL494 IC based Firing circuits with duty cycle ratio & Frequency AdjustmentOne number of potentiometer is provided for duty cycle ratio adjustmentsOne number of potentiometer is provided for frequency adjustments2 Numbers of Pulse outputs are terminated in the PCB for external Patching.24v,1Amp DC is provided for power circuit inputs & DC Voltmeter is provided for input/output dc voltage measurementOne number of power resistor is provided as fixed R Load with terminations for External patchingAll necessary test points are provided for external patchingAll are mounted on a nice cabinet with sticker front panel with mimic diagram230VAC input with power ON/OFF Switch